QSC Audio Car Speaker KSub User Manual

K Series  
User Manual  
K8 – 105° 1000 W active 8" (200 mm) 2-way loudspeaker system  
K10 – 90° 1000 W active 10" (250 mm) 2-way loudspeaker system  
K12 – 75° 1000 W active 12" (300 mm) 2-way loudspeaker system  
KSub – Dual 12" (300 mm) 1000 W active 4th-order bandpass subwoofer system  
TD-000280-00-A1  
*TD-000280-00-A*  
Warranty (USA only; other countries, see your dealer or distributor)  
QSC Audio Products 3 Year Limited Warranty  
QSC Audio Products, LLC (“QSC”) guarantees its products to be free from defective material and/or workmanship for a period of three (3) years from  
the date of sale and will replace defective parts and repair malfunctioning products under this warranty when the defect occurs under normal installa-  
tion and use – provided the unit is returned to our factory or one of our authorized service stations via prepaid transportation with a copy of proof of  
purchase (i.e., sales receipt). This warranty provides that the examination of the returned product must indicate, in our judgement, a manufacturing  
defect. This warranty does not extend to any product which has been subjected to misuse, neglect, accident, improper installation, or where the date  
code has been removed or defaced. QSC shall not be liable for incidental and/or consequential damages. This warranty gives you specific legal rights.  
This limited warranty is freely transferable during the term of the warranty period.  
Customer may have additional rights, which vary from state to state.  
In the event that this product was manufactured for export and sale outside of the United States or its territories, then this limited warranty shall not  
apply. Removal of the serial number on this product, or purchase of this product from an unauthorized dealer will void this limited warranty.  
FCC Statement  
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules.  
These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses  
and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio  
communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful  
interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct  
the interference by one or more of the following measures:  
• Reorient or relocate the receiving antenna.  
• Increase the separation between the equipment and receiver.  
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.  
• Consult the dealer or an experienced radio/TV technician for help.  
© Copyright 2009, QSC Audio Products, LLC.  
USA and Foreign Patents Pending.  
QSC® is a registered trademark of QSC Audio Products, LLC.  
“QSC” and the QSC logo are registered with the U.S. Patent and Trademark Office.  
All trademarks are the property of their respective owners.  
Package Contents  
KSub  
K8, K10, K12  
(1) Subwoofer system  
(1) Loudspeaker system  
(1) Locking NEMA 5-15 power cable  
(1) Locking NEMA 5-15 power cable  
(1) Locking CEE 7/4 power cable  
(1) Locking CEE 7/4 power cable  
(1) User Manual CD  
(1) User Manual CD  
(1) Wiring hookup diagram  
(1) Wiring hookup diagram  
(1) M20 threaded loudspeaker pole  
3
7
Features  
K8  
4
1. ABS enclosure  
6
1
2. Steel grille  
3. Front power LED  
4. Cast aluminum handles  
5. Power module  
7
7
2
6. M10 installation points  
7. M5 yoke attachment points  
8. Tilt-Direct™ dual angle pole socket  
9. Slip-resistant feet  
5
3
6
9
7
9
8
7
4
K10  
1
6
1. ABS enclosure  
2. Steel grille  
3. Front power LED  
4. Cast aluminum handles  
5. Power module  
7
4
4
7
2
5
6. M10 installation points  
7. M5 yoke attachment points  
8. Tilt-Direct™ dual angle pole socket  
9. Slip-resistant feet  
3
6
9
9
8
7
4
7
4
K12  
1. ABS enclosure  
1
6
2. Steel grille  
3. Front power LED  
4. Cast aluminum handles  
5. Power module  
7
4
4
7
2
9
5
6. M10 installation points  
7. M5 yoke attachment points  
8. Tilt-Direct™ dual angle pole socket  
9. Slip-resistant feet  
3
6
9
9
8
7
7
6
KSub  
1
4
1. Birch plywood enclosure  
2. Front power LED  
3. Acoustic port  
7
3
4. Cast aluminum handles  
5. Power module  
5
6. M20 threaded pole receptacle  
7. 3" heavy duty casters  
8. Slip-resistant feet  
2
4
8
7
5
Applications  
The K Series has been primarily designed for portable audio reinforce-  
ment. This includes a variety of uses in reinforcement for entertainers  
and presenters. The K8, K10 and K12 are all designed to perform well on  
their own in full-range audio. They can be used singly, in stereo pairs or  
in distributed or delayed systems. They perform extraordinarily well as  
both main reinforcement systems and as floor monitors (K10 and K12  
only). (Figure 1)  
The K8, K10, and K12 are all equipped with a 35 mm pole socket that  
allows use on a speaker stand or on a pole over a subwoofer. The pole  
socket features the QSC Patented Tilt-Direct™ system for tilting the  
enclosures down 7.5 degrees while on the pole. (Figure 2)  
– Figure 1 –  
The K8, K10 and K12 also have features designed for various suspen-  
sion methods. They feature M10 threaded inserts for suspension with  
eyebolts. There are also yoke accessories (model numbers: K8 YOKE,  
K10 YOKE, K12 YOKE) for each model that can mount either to the sides  
of the cabinet or to the top and bottom. These yokes allow for rigid  
mounting to structures and rotation of the speaker system. (Figure 3)  
For extra low-frequency extension and enhancement, the KSub is per-  
fectly matched to the rest of the K Series. The K8, K10 and K12 all have a  
selectable high-pass filter for use with the subwoofer. The KSub includes  
a fixed low-pass filter so it will accept full-range input.  
The KSub has four large casters for maximum portability. The pole sock-  
et on the top of the enclosure is fitted with an M20 threaded insert. The  
included speaker pole screws into the socket for a secure fit. (Figure 4)  
– Figure 2 –  
– Figure 3 –  
– Figure 4 –  
6
Installation  
Before placing, installing, rigging, or suspending any speaker product, inspect all hardware, suspension, cabinets, transducers, brack-  
ets and associated equipment for damage. Any missing, corroded, deformed, or non-load rated component could significantly reduce  
the strength of the installation or placement. Any such condition severely reduces the safety of the installation and should be immediately cor-  
rected. Use only hardware which is rated for the loading conditions of the installation and any possible short-term, unexpected overloading.  
Never exceed the rating of the hardware or equipment.  
Consult a licensed, professional engineer regarding physical equipment installation. Ensure that all local, state and national regulations  
regarding the safety and operation of loudspeakers and related equipment are understood and adhered to.  
Recommended Deployment  
K8: The K8 was designed to sit on the floor, stage, subwoofer enclosure, be suspended, or be pole mounted on a 35 mm diameter loudspeaker sup-  
port pole. When pole-mounted to the KSub, pole length must not exceed 31 inch (787 mm).  
K10: The K10 was designed to sit on the floor, stage, subwoofer enclosure, be suspended, or be pole mounted on a 35 mm diameter loudspeaker  
support pole. When pole-mounted to the KSub, pole length must not exceed 28.5 inch (724 mm).  
K12: The K12 was designed to sit on the floor, stage, subwoofer enclosure, be suspended, or be pole mounted on a 35 mm diameter loudspeaker  
support pole. When pole-mounted to the KSub, pole length must not exceed 26.5 inch (673 mm).  
KSub: The KSub was designed to sit on the floor or on the stage. A threaded pole cup on the top of the enclosure accepts a M20 threaded 35 mm  
loudspeaker mounting pole. There are additional M20 speaker poles available from third party suppliers. Rubber feet on the enclosure’s bottom help  
to minimize enclosure movement during operation. Do not pole mount or stack more than one enclosure on top of the KSub enclosure. As the casters  
will wear during normal use, it may be required to insert small foam pieces between the wheels and frames to minimize rattling at high output levels.  
K8 WARNING! Do not use a loudspeaker support pole longer than 31 inch (787 mm) when supported by the KSub subwoofer.  
K10 WARNING! Do not use a loudspeaker support pole longer than 28.5 inch (724 mm) when supported by the KSub subwoofer.  
K12 WARNING! Do not use a loudspeaker support pole longer than 26.5 inch (673 mm) when supported by the KSub subwoofer.  
K12  
K10  
K8  
24.5"  
(622 mm)  
K SERIES  
POLE  
24.5"  
(622 mm)  
K SERIES  
POLE  
24"  
(612 mm)  
K SERIES  
POLE  
KSub  
KSub  
KSub  
7
Integrated Suspension Points (suspended installations)  
The K8, K10 and K12 enclosures each feature three load-rated M10 installation points.  
As shipped from the factory, each pick point has a rubber plug installed to retain the sleek look of the enclosure. These installation points are designed  
for use with the eyebolts included in the available accessory kit, model number K SERIES M10 KIT. The installation points may also be used with any  
forged shoulder eyebolt with an M10 thread, provided the length of the thread is no more than 0.8 inch (20 mm).  
Ensure all pick-point fasteners are installed and correctly tightened in order to maintain enclosure’s rated strength. Use either  
QSC’s M10 forged shoulder eye bolts contained in K SERIES M10 KIT or an M10 forged shoulder eyebolt with a thread length no more  
than 0.8 inch (20 mm). Contact QSC Technical Services department for complete information.  
K8  
K10  
K12  
Cooling in Installed Applications  
This is a self-powered loudspeaker containing an internal power amplifier that produces heat. Allow a minimum of 6" (152 mm) clearance at cabinet  
back for convection cooling. Keep anything that might restrict airflow away from the rear of the enclosure (i.e draperies, fabric, etc...).  
Do not install enclosures with their rear panels exposed to direct sunlight. Direct sunlight will heat the amplifier module and reduce  
its ability to produce full output. Install sunshades if the application merits. Maximum ambient temperature for full performance to  
specification is 50° C (122° F). Do not install enclosures where exposed to rain or other water sources. The enclosure is not weatherproof.  
Outdoor installations must provide protection from the elements.  
8
AC Mains  
Connect AC power to the IEC socket on the back of the amplifier by locating the IEC connector-end of the  
AC power cord and inserting it fully into the IEC inlet on the power amplifier module. NOTE: Turn off the AC  
power switch before connecting AC power.  
The V-LOCK power cord has a special latching feature to prevent the power cord from being unintentionally  
removed. The IEC plug and socket are both blue in color so the power cord can be identified as a K Series  
loudspeaker cord. If the QSC supplied cord becomes lost or damaged, a standard replacement 18 gauge IEC  
power cord may be used. However, the latching system will only function with a V-LOCK power cord available  
from QSC Audio Products, LLC.  
The K Series is fed by a universal power supply. This power supply is capable of operating the system with input AC power voltages ranging from 85  
VAC to 265 VAC at 50 – 60 Hz. There are multiple power cables supplied for this reason.  
Use only the power cable that is correct for your location.  
You may discard any other power cables, find an appropriate recycling opportunity or keep them if travel to other regions with the K Series product is likely.  
AC Mains Disconnection  
Turn the AC power switch to the off position. To remove the AC mains cord, grasp the IEC connector’s plastic body, press the yellow latch release but-  
ton and pull, removing the connector from the socket.  
Power Switch  
Push in on the top of the rocker switch to apply AC mains power to the powered loudspeaker. Push in on the bottom of the rocker switch to turn the  
powered loudspeaker off.  
When turned on, the green STANDBY indicator LED and the red LIMIT (limiter) indicator LED on the rear panel will illuminate; after a few seconds the  
red LIMIT indicator and the green STANDBY will extinguish, and the blue POWER indicator LED will illuminate.  
Rear LED POWER Indicator  
The blue LED POWER indicator on the rear panel will illuminate when the AC Power switch is in the “ON” position, the unit is not in standby, the  
AC mains power cord is connected properly, and the AC mains are functioning properly. The rear LED POWER indicator will extinguish when the AC  
Power switch is in the “off” position, AC mains power has been removed from the loudspeaker, or the amplifier enters standby.  
If the rear LED POWER indicator does not illuminate when the Power switch is placed in the “on” position during the first 5 minutes of power being  
applied, verify the AC mains line cord is properly attached to the loudspeaker and plugged into the AC outlet. Verify the outlet is functioning properly.  
If the AC mains cordset is serviceable and the AC mains outlet is operating properly, but the loudspeaker fails to operate, the loudspeaker may  
require servicing. Contact QSC’s Technical Services department.  
System Power Sequencing  
Proper power turn on/turn off sequencing can help to prevent unexpected sounds from being produced by the system (pops, clicks,  
thumps). These unintended sounds can be unpleasant and take away from the overall professionalism of the presentation. Always  
follow the rule that speakers are “last on, first off”.  
Power On Sequence: Bring the output level control of the mixer (or other audio source) feeding your speakers to its minimum position. Turn on all  
source devices (CD players, mixers, instruments), turn on subwoofer, then turn on the “top-boxes” (K8, K10, K12). The level controls on your mixer  
may now be brought up.  
Power Off Sequence: Turn off “top boxes,” turn off subwoofer, then turn off all source devices.  
If a K Series speaker is being driven from the output of another K Series unit, it should be turned on after the unit feeding it signal, and turned off  
before the unit feeding signal.  
9
Input Connections  
K8, K10, K12  
Channel A MIC/Line Input  
Combination XLR-M and  
1/4" Phone Jack  
Channel B Line Input  
Combination XLR-M  
and 1/4" Phone Jack  
Channel A MIC Level  
Yellow LED Indicator  
Channel A MIC/Line  
Level Switch  
Channel B Line Input  
Phono (RCA) Jacks  
Channel A Green  
Signal Present LED  
Channel B Green  
Signal Present LED  
Channel B Gain  
Channel A Gain  
The K8, K10 and K12 are designed to accept MIC Level and Line Level inputs with several different connectors.  
There are three input connection points on the input panel. Channel A will accept MIC or Line Level inputs by  
connecting a male XLR cable or a male 1/4" phone cable (either TS or TRS type may be used). For MIC Level, the  
MIC/LINE selector switch must be in the “MIC” position. (Figure 5) When the selector switch is in the MIC posi-  
tion, activating the MIC Pre-amp, the yellow MIC level LED indicator will turn on. The MIC setting should only be  
used if a microphone is connected directly to the MIC/LINE input. Note that the input does not provide phantom  
power. The LINE setting should be used for most other audio inputs. (Figure 6)  
The MIC setting should only be used if a microphone is connected directly to the MIC/LINE input.  
Using the MIC setting for other purposes may introduce distortion. Care should be taken when  
switching to the MIC position as the output level will increase significantly when the switch is flipped.  
Gain for signal delivered on the Channel A XLR/1/4" combination jack is set using the Channel A Gain knob. This  
control sets the sensitivity of Channel A, and thereby the amount of signal sent to the power amplifier and, in turn  
to the loudspeaker components. It also sets the amount of signal sent to the Post-Gain Line Output. The green  
SIGNAL LED will illuminate when signal is present, regardless of the amount of gain as set by the Gain knob. If the  
LED does not illuminate, the input is not receiving any signal or the level of the signal is significantly low. Check all  
connections and the status of the device delivering the signal.  
– Figure 5 –  
Channel B will accept Line Level input only, by connecting a male XLR cable or a male 1/4" phone cable (either TS or  
TRS type may be used). Channel B will also accept mono or stereo Line Level input on a pair of RCA (phono) jacks.*  
Gain for signal delivered on the Channel B line level XLR/1/4" combination jack and RCA (phono) jacks is set  
using the Channel B Gain knob. The Channel B Gain knob will control the input gain of Channel B, as well as the  
amount of signal sent to the Post-Gain Line Output. The green SIGNAL LED will illuminate when signal is present,  
regardless of the amount of gain as set by the Gain knob. If the LED does not illuminate, the input is not receiving  
any signal, or the level of the signal is significantly low. Check all connections and the status of the device deliver-  
ing the signal.  
Note: Unless the gain controls associated with all active inputs are set to 0 dB, the output signal from the  
Post-Gain Line Output will not be at the same level as the input signal. If a “slave” speaker is intended to  
playback at the same level as the “master” speaker, the gain control on the “slave” speaker should be set  
to 0 dB.  
– Figure 6 –  
*Stereo input received at the RCA input jacks will be summed to mono.  
10  
Balanced Inputs: Connect to the plug as shown.  
1 = Shield (ground)  
3 = Minus (-)  
2 = Plus (+)  
Ground  
Inverting Input  
Non-inverting Input  
Unbalanced Inputs: Connect to the plug as shown. If a 3 conductor (TRS) plug is used to connect an unbalanced source, Pin 3 and pin 1 must  
be connected with a jumper as shown.  
1 = Shield (ground)  
3 = Minus (-)  
2 = Plus (+)  
Ground  
Non-inverting Input  
Input Connections  
KSub  
Channel B Line Input  
Combination XLR-M  
and 1/4" Phone Jack  
Channel A Line Input  
Combination XLR-M  
and 1/4" Phone Jack  
Green Signal  
Present LED  
Channel A and B  
Mixed Gain Knob  
The KSub is designed to accept Line Level inputs connected either by male XLR or 1/4" phone (TS or TRS) jack. If signal is connected to both Channel  
A and Channel B, they will be summed together. The gain of the summed signal is then controlled using the Gain knob. This affects the amount of  
signal sent to the amplifier and then to the loudspeaker components. The green SIGNAL LED will illuminate when signal is present, regardless of the  
amount of gain as set by the Gain knob. If the LED does not illuminate, the input is not receiving any signal, or the level of the signal is significantly  
low. Check all connections and the status of the device delivering the signal.  
11  
Output Connections  
K8, K10, K12  
Channel A Line  
Level Direct Output  
Channel B Line  
Level Direct Output  
Channel A  
Gain Knob  
Channel B  
Gain Knob  
Post-Gain  
Line Output  
Both Channel A and Channel B have discreet direct outputs on female XLR connectors. The signal on this output is exactly equivalent to the signal  
from the corresponding input. The level of the output signal is not affected by the gain setting for that channel. Additionally, signal delivered on the  
RCA (phono) jacks is not present on the Channel B direct line level output.  
The Post-Gain Line out female XLR connector is a mixed output of Channel A, Channel B and the RCA (phono) jacks. This mix is affected by gain  
knobs on both Channel A and Channel B and the MIC/LINE switch on Channel A, but the output level is still Line Level.  
WARNING! Do not connect the POST-GAIN LINE OUTPUT of a K Series system to any INPUT of the SAME UNIT. This output is  
designed to send signal to OTHER K Series units or to other audio equipment. Failure to follow this warning may result in very  
unpleasant sounds produced at extremely high output volumes.  
Output Connections  
KSub  
Channel B Line  
Level Direct Output  
Channel A Line  
Level Direct Output  
Channel A and B  
Mixed Gain Knob  
Both Channel A and Channel B have discrete direct outputs on female XLR connectors. The signal on this output is exactly equivalent to the signal  
from the corresponding input. The level of the output signal is not affected by the gain set on the subwoofer gain knob.  
12  
DSP Features  
The K Series features advanced DSP (digital signal processing) circuitry that performs many functions. Some functions are set at the design/production  
level and are not user accessible. These functions include crossovers, time alignment, limiting and protection, thermal management and a number of  
proprietary features. QSC has designed exclusive DSP functions that greatly enhance the capabilities and performance of the K Series systems.  
Proprietary DSP Functions  
Excursion Limiting: In addition to signal limiting to protect the amplifier and transducers from overload, the K Series utilizes a proprietary limiter that  
prevents woofer over-excursion. Over-excursion occurs when a voltage presented to the woofer causes the cone to physically travel too far. This builds  
up excessive heat, stresses the moving parts of the woofer, produces audible artifacts and distortion and reduces the woofer’s lifespan. The proprietary  
algorithm contained in Excursion Limiting prevents over-excursion. Voltages that will harm the woofer through over-excursion are reduced enough to  
prevent over-excursion without any audible compression, limiting or loss.  
DEEP™: Taking advantage of the Excursion Limiter, the DEEP (Digital Extension and Excursion Processing) algorithm functions as a highly musical and  
non-distorting low-frequency EQ circuit. More on the DEEP function is available in the EQ section of this manual.  
Intrinsic Correction™: Introduced on QSC Concert/Touring products, Intrinsic Correction is a proprietary process and set of signal processing algo-  
rithms that address correctable characteristics of transducers and waveguides. The net result is that any K Series system will present extraordinarily  
even and consistent energy throughout the physical listening area of the loudspeaker, resulting in a very musical, acoustically transparent system.  
DSP User Functions  
Low-frequency EQ  
On the K8, K10 and K12, there are three low-frequency settings. From the factory, the switch is set to “NORM.”  
This means that the loudspeaker system is producing a normal low-frequency signal through the woofer. This is  
the standard setting for most applications. (Figure 7)  
When using one of the top boxes with a subwoofer, the switch should be moved to the “EXT SUB” position to  
engage the 100 Hz high-pass filter. It is also recommended that the 100 Hz high-pass filter be engaged when using  
the K10 or K12 as a floor monitor to prevent excessive bass build up on the stage.  
– Figure 7 –  
For extra low-frequency extension and low-end presence when using one of the top boxes without a sub, move  
the switch to the “DEEP” setting. This will engage the proprietary DEEP algorithm, providing increased low-  
frequency extension without causing distortion or woofer over-excursion.  
On the KSub there are two low-frequency settings. From the factory, the switch is set to “NORM.” This means  
that the subwoofer system is producing a non-EQ’d low-frequency signal through the woofer. This is the standard  
setting for most applications. (Figure 8)  
For extra low-frequency extension and low-end presence, move the switch to the “DEEP” setting. This will engage  
the proprietary DEEP algorithm, providing increased low-frequency extension without causing distortion or woofer  
over-excursion.  
– Figure 8 –  
High-frequency EQ  
On the K8, K10 and K12 there are two high-frequency settings. From the factory, the switch is set to “FLAT.” This  
means that the loudspeaker system is producing a flat response through the vocal band. This is the standard set-  
ting for most applications. (Figure 9)  
In voice-only reproduction, the switch can be set to the “VOCAL BOOST” setting. This will engage EQ that gives a  
stronger presence for vocal intelligibility and presence. It is generally not recommended to use this setting when  
playing full-range music through the system.  
– Figure 9 –  
13  
Subwoofer Polarity  
Polarity (sometimes improperly referred to as phase) refers to the voltage of an input signal and whether it is a  
positive or negative voltage at any given time. In most cases a positive voltage causes a woofer cone to move  
forward with respect to the cabinet orientation, and a negative voltage then moves the woofer cone backward.  
Most importantly, speakers reproducing the same signal or signals that are adjacent in frequency must have the  
same polarity to get the maximum output. This is most important for low frequencies. Polarity can be altered by  
incorrect wiring or mixer control settings. (Figure 10)  
– Figure 10 –  
When using the KSub with K Series full range loudspeakers, NORMAL polarity will result in the best bass response  
IF the full range loudspeakers are sitting on or very close to the subwoofers. If the subwoofers are some distance  
away from the full range loudspeakers, polarity change may be of benefit. Start with all subwoofer POLARITY  
switches in the NORMAL position. Then, with the system at or near expected operating levels, change the polarity  
of each subwoofer INDIVIDUALLY. Walk around the venue and assess the overall bass response. Select the polarity  
that results in the best overall system bass response.  
When using only one KSub and connecting a LEFT and RIGHT stereo signal, start with the polarity switch in the  
NORMAL position. With the system at a reasonable level, change the POLARITY switch and evaluate which polar-  
ity results in the most low-frequency output.  
Additional Features  
Standby  
All K Series models are equipped with an automatic standby feature to conserve energy when the systems are not  
in use. If no signal is present on any input of a K Series system or the gain knob is turned to off for five minutes,  
the power amplifier will go into standby and the green STANDBY LED will illuminate. No other LEDs will illuminate  
when the unit is in standby; this includes both the Rear Power LED and the Front Power LED. In this mode, the  
amplifier will be powered down. A small amount of voltage will continue to flow from the AC power source into  
the power supply of the K Series power module. This voltage will keep the power supply and DSP “awake” to  
reduce turn on time when the system is brought out of standby. The power up time of the amplifier is negligibly  
small and is shorter than the latency of the DSP, so no signal will be cut off when the K Series system is brought  
out of standby. A K Series loudspeaker can also be brought out of standby manually by turning the power switch  
off and then back on.  
Front Power LED Functions  
The Front Power LED may be set to any of three modes by the rear-mounted Power LED switch. (Figure 11)  
From the factory, the Power LED switch is set to the PWR position. The Front Power LED will illuminate when  
the power switch is in the ON position and the unit is not in Standby.  
– Figure 11 –  
In the “OFF” position, the Front Power LED will not illuminate. This setting is recommended in applications  
where the Front Power LED may be visually objectionable while the unit is operating.  
In the LIMIT setting the Front Power LED will track the LIMIT LED on the rear of the unit. When the K Series  
is in Limiting (meaning that one or more of the limiters is engaging to protect some part of the system) the  
Front Power LED will glow brighter in response to the limiting function. This allows the system operator to have  
awareness of the status of the limiters without needing to see the rear of the unit. For more information see the  
section below on the Rear LIMIT LED. When not in limiting and when the unit is not in standby, the front power  
LED will be illuminated dimly.  
Rear LIMIT LED  
The red LIMIT LED can indicate that limiting has taken place to protect and avoid damage to the amplifier or loud-  
speaker. (Figure 12) If the signal level at any frequency is too high, the DSP will limit the signal to prevent damage  
and the red LIMIT LED will illuminate. If the amplifier is too hot because the SPL is too high or the environment is  
too hot, the red LIMIT LED will be illuminated. If the red LIMIT LED is on when both Gain controls are at mini-  
mum, your K Series loudspeaker requires service by qualified personnel.  
– Figure 12 –  
14  
Remote Gain Attenuator  
A 3 pin “Euro” connector has been provided to adjust the volume of the K Series loudspeaker or put the system  
into standby. (Figure 13) By varying the voltage on the  
ground ( pin), the volume can be linearly controlled. The voltage on the  
potentiometer or provided from an external source. Many K Series systems can be controlled from a single poten-  
tiometer by connecting the pins of multiple K Series speakers together.  
pin between +5V (provided on  
pin) and  
pin can be created by using a  
A relay or manual connection can be made between the  
standby mode after 5 minutes.  
pin and the  
pin to put the K Series system into  
– Figure 13 –  
WARNING: Do not put more than +5V or less than ground on the  
occur. Do not connect the pin directly to the pin.  
pin or else damage may  
Schematics of Proper Wiring for Gain Attenuator  
When using a single potentiometer for one loudspeaker. (Figure 14)  
When using a single potentiometer for multiple loudspeaker. (Figure 15)  
Wiring to the 3 pin “Euro” connector. (Figure 16)  
– Figure 14 –  
– Figure 15 –  
– Figure 16 –  
15  
Applications  
Input Hookup  
Output Hookup  
16  
Output Hookup  
OR  
17  
Common Standalone Small System (Mono)  
Common Stereo System  
LEFT  
RIGHT  
18  
Dimensions  
K8  
K10  
Top  
Top  
11"  
12.6"  
10.6"  
11.8"  
280 mm  
320 mm  
269 mm  
300 mm  
17.7"  
20.4"  
450 mm  
519 mm  
Front  
Side  
Front  
Side  
K12  
KSub  
Top  
Top  
14"  
356 mm  
14"  
356 mm  
14"  
356 mm  
28.1"  
714 mm  
23.7"  
603 mm  
26"  
665 mm  
Front  
Side  
Front  
Side  
19  
Specifications  
K8  
K10  
K12  
KSub  
Configuration  
Trapezoidal 2-way  
Multipurpose 2-way  
Multipurpose 2-way  
4th Order Bandpass  
Transducers  
Low-frequency  
High-frequency  
8" cone transducer  
10" cone transducer  
12" cone transducer  
2 x 12" cone transducers  
1.75" diaphragm compression driver 1.75" diaphragm compression driver 1.75" diaphragm compression driver  
Frequency Response (-6 dB) 66 Hz – 18 kHz  
Frequency Range (-10 dB) 61 Hz – 20 kHz  
Nominal Coverage (-6 dB) 105° conical  
60 Hz – 18 kHz  
56 Hz – 20 kHz  
90° conical  
52 Hz – 18 kHz  
48 Hz – 20 kHz  
75° conical  
48 Hz – 134 Hz  
44 Hz – 148 Hz  
Maximum SPL (1 meter)  
127 dB peak  
129 dB peak  
131 dB peak  
130 dB peak  
Amplifiers  
Power Output  
1000 W Class D  
Input Impedance (Ω)  
XLR/¼": 40k balanced/20k unbalanced • XLR/¼" MIC mode: 2260 balanced • RCA: 10k  
Controls  
Power • Gain A • Gain B • Mic/Line • LF Mode (Ext Sub/Norm/DEEP™) • HF Mode (Flat/Vocal Boost)  
Front LED (On/Off/Limit)  
Power • Gain • LF Mode (Normal/  
DEEP™) • Polarity (Normal/Reverse)  
• Front LED (On/Off/Limit)  
Indicators  
Power • Signal A • Signal B • Standby • Limit • Mic  
Power • Signal • Standby • Limit  
Connectors  
Balanced female XLR/¼" line/mic level input • Balanced female XLR /¼" line level input • Dual Balanced male XLR Dual balanced female XLR/¼"  
full range line level out • Balanced male XLR “mix” out • Stereo RCA line level input • Remote gain control • Locking line level input • Dual Balanced  
IEC power connector  
male XLR full range line level out •  
Remote gain control • Locking IEC  
power connector  
Cooling  
On demand, 50 mm variable speed fan  
Amplifier Protection  
Transducer Protection  
AC Power Input  
Thermal limiting • Output overcurrent • Overtemperature muting • GuardRail™  
Thermal limiting • Excursion limiting  
Universal power supply 85 – 265 VAC, 50 – 60 Hz  
AC Power Consumption 100 VAC, 2.3 A • 120 VAC, 2.01 A • 230 VAC, 1.13 A  
1/8 Power  
Enclosure  
Impact resistant ABS  
Black Paint  
Painted birch plywood  
Black textured paint  
Finish  
Grille  
Black powder coated 18 gauge steel  
Dimensions (HWD)  
17.7" x 11" x 10.6"  
20.4" x 12.6" x 11.8"  
23.7" x 14" x 14"  
26" x 14" x 28.1" (including casters)  
665 mm x 356 mm x 714 mm  
450 mm x 280 mm x 269 mm  
519 mm x 320 mm x 300 mm  
603 mm x 356 mm x 356 mm  
Weight (Net)  
27 lb (12.2 kg)  
32 lb (14.5 kg)  
41 lb (18.6 kg)  
74 lb (33.6 kg)  
Available Accessories  
K8 TOTE • K8 YOKE •  
K10 TOTE • K10 YOKE •  
K12 TOTE • K12 YOKE •  
KSub COVER  
K SERIES M10 KIT  
K SERIES M10 KIT  
K SERIES M10 KIT  
Specifications subject to change without notice.  
20  
Mailing Address:  
QSC Audio Products, LLC  
1675 MacArthur Boulevard  
Costa Mesa, CA 92626-1468 USA  
Telephone Numbers:  
Main Number: 714-754-6175  
Sales & Marketing: 714-957-7100 or toll free (USA only) 800-854-4079  
Customer Service: 714-957-7150 or toll free (USA only) 800-772-2834  
Facsimile Numbers:  
Sales & Marketing FAX: 714-754-6174  
Customer Service FAX: 714-754-6173  
World Wide Web:  
qscaudio.com  
E-mail:  
© 2009 QSC Audio Products, LLC. All rights reserved. QSC and the QSC logo are registered trademarks of QSC Audio Products, LLC in the U.S. Patent and Trademark office and other countries. Tilt-Direct,  
Intrinsic Correction, DEEP and GuardRail are all trademarks of QSC Audio Products, LLC. All other trademarks are the property of their respective owners. Patents may apply or be pending.  
K Series User Manual 05/27/09  

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