QSC Audio Stereo Amplifier PLX 1104 User Guide

PLX Series Professional Audio Amplifiers  
User Manual  
®
4-ohm minimum impedance models with Speakon output terminals:  
PLX 1104  
PLX 1804  
2-ohm minimum impedance models with Speakon and binding post terminals:  
PLX 1802  
PLX 2502  
PLX 3102  
PLX 3602  
*TD-000214-00*  
TD-000214-001Rev.C  
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Introduction  
Thank you for purchasing this QSC power amplifier. Please read the following directions to obtain the best results. This manual covers all  
models of the PLX series. Illustrations show the PLX 1804 to be representative of the PLX 1104 and 1804 models, while the PLX 3602 illus-  
tration is representative of the PLX 1802, PLX 2502, PLX 3102, and PLX 3602 models.  
The PLX 1104 and PLX 1804 models feature:  
• 4-ohm minimum impedance  
• Speakon loudspeaker connections  
QSC PowerLight high-performance, compact, and light weight switching power supply  
Complete amplifier protection  
XLR and 1/4-inch TRS balanced input connectors  
Gain controls are recessed and 21-step detented  
Active inrush current limiting eliminates need for power sequencing  
LED indicators for power, input signal presence, -10 dB, and clip/protect  
Rear chassis tabs and front panel design protect controls and connectors  
In addition, the PLX 1802, PLX 2502, PLX 3102, and PLX 3602 models feature:  
• 2-ohm minimum impedance  
Bridgeable output  
Binding post loudspeaker connections  
Clip limiter  
• 33 Hz low frequency filter  
Low-cut/full-range/high-cut selector  
• Stereo/bridge mode/parallel input selector  
Front panel LED indicators for parallel and bridge modes  
Unpacking  
Factory packed carton contains:  
PLX amplifier  
User's manual  
Adhesive rubber feet (for non-rack mount applications)  
IEC-type detachable power cord  
Use the same type carton when shipping the amplifier.  
Front Panel  
1- Power Switch  
2- Cooling Air Exhaust Vents  
3- LED Indicators  
4- Gain Controls  
3
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Rear Panel  
1- Input Configuration switch  
2- 1/4-inch TRS input connectors  
3- XLR female input connectors  
4- Low Frequency Filter switches  
5- Speakon output connectors  
6- Binding post output connectors  
7- Cooling air inlet vents  
8- Clip Limiter switch  
9- Serial number plate  
10- IEC-type AC mains inlet  
11- Circuit breaker, resettable  
Rack Mounting  
The front panel casting includes features for  
finger-lifting and gripping at each end.  
Use four screws and washers to mount the amplifier to the  
equipment rack rails. To use the amplifier outside a rack,  
attach the self-adhesive rubber feet to the bottom.  
For portable, mobile, or other applications where the rack  
assembly may be moved, we strongly recommend support-  
ing the rear of the amplifier. A rear rack ear kit is available  
from QSCs Technical Services Group.  
The cast front panel includes finger grips at each end, mak-  
ing lifting and setting into the rack more comfortable.  
4
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Cooling  
Air flow in QSC amplifiers: Cool air is drawn into the  
rear of the amplifier by the cooling fan. Warm air exits  
the front of the amplifier.  
Air flows from the rack, into the back of the amplifier, and out the  
front. This keeps the rack cool. The fan automatically runs faster  
when the amp is working hard.  
Do not block the front or rear air vents!  
AC Mains Connection  
Connect AC power to the IEC socket on the back of the amplifier.  
NOTE: Turn off the AC power switch before connecting AC power.  
Connect the AC mains plug to a suitable AC mains outlet.  
Orient the IEC connector with the connector prongs in  
the socket, then push the connector firmly into the IEC  
socket until fully seated.  
The correct AC line voltage is shown on the serial number  
label, on the rear panel. Connecting to the wrong line  
voltage may damage the amplifier or increase the risk of  
electric shock.  
The rear chassis ear can be used to retain the IEC power  
connector. After inserting the IEC block into the recepta-  
cle, use a wire-tie or similar device to secure the cord to  
the chassis ear.  
AC Mains Current Draw  
The table at the right provides typical current draw for each model as  
a function of load and output power level. Units of measurement are  
amperes rms.  
NOTE! Current draw shown is for 120 VAC line. For 230  
VAC models, multiply values shown by 0.5.  
• 1/8 power (pink noise) represents typical program with occa-  
sional clipping. Use this rating for most applications.  
• 1/3 power (pink noise) represents severe program with heavy  
clipping.  
Full power (sine) is continuous sine wave driven at 1% clipping.  
PLX 1802, PLX 2502, PLX 3102, and PLX 3602 models: Thermal  
or overcurrent cutback limits duration of full power 2 ohm  
operation. Long term, active limiting to 30A at 120V.  
PLX 1104 and PLX 1804 models: Long-term, circuit breaker lim-  
ited to 15A at 120V.  
5
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Input Configuration Switch (PLX 1802/2502/3102/3602 models only)  
Input Configuration selector switch  
Select the input configuration by sliding the switch to the position which corresponds with the  
desired input configuration.  
Bridge- upper position  
• Stereo- middle position  
Parallel- lower position  
Stereo Mode: Each channel remains independent, and each may be used for a different signal.  
Parallel Mode: This setting connects both inputs together. One input signal feeds both chan-  
nels. Do not connect different sources to each input. Each channel's Gain control and speaker  
connection remain independent.  
Clip Limiter ON/OFF switch  
Bridge Mode: This setting combines both channels into a single channel with twice the output  
voltage. Use only Channel 1s input and Gain control. Set Channel 2's Gain control at minimum.  
Use only one input when operating in parallel or bridge mode.  
Low Frequency filter selection  
switches for each channel  
Clip Limiters (PLX 1802/2502/3102/3602 models only)  
The amplifier has a clip limiter with an on-off switch. The limiter only responds to actual clipping,  
and automatically compensates for load and voltage variations. Clip limiting is generally recom-  
mended, especially to protect high frequency drivers.  
• Set the switch UP (ON position) to use Clip Limiting.  
• Set the switch DOWN (OFF position) to disable the clip limiter.  
Low Frequency Filters (PLX 1802/2502/3102/3602 models only)  
Each channel has independent filter selection of Full Range (infrasonic filter only), 33 Hz low cut,  
100 Hz low cut, or 100 Hz High Cut. This allows tailoring the amplifier performance to that of the  
loudspeakers, offering the best possible performance from the system. Proper filtering reduces  
distortion and prevents amplifier overload.  
TOP / FULL / SUB Switch: Select the type of loudspeaker being driven by each channel.  
• Set the switch to the left for driving “top” boxes; applies 100 Hz low cut  
• Set the switch to the middle position for “full range” loudspeakers.  
• Set the switch to the rightmost position for driving subwoofers.  
Low Frequency filter selection table  
33 Hz (low cut) / FULL Switch: Unless the loudspeaker has extended low frequency capabil-  
ity, we recommend setting the filter to the 33 Hz setting. The filter should only be set to FULL  
(turned off) for driving subwoofers. Check the loudspeakers specifications and use the 33 Hz filter  
if the loudspeakers low frequency capability does not extend below 33 Hz.  
• Set to FULL when driving loudspeakers that have low frequency capability below 33 Hz or  
in studio monitoring applications.  
• Set to 33 Hz for loudspeakers which are not rated for frequencies below 33 Hz.  
6
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Inputs  
Each channel has a balanced XLR (female) and 1/4-inch TRS input. The XLR and TRS  
connectors for each channel are wired in parallel and can be used for “daisy chain-  
ing” an input signal to additional amplifiers.  
Input connectors and pinout  
chart (PLX1802 shown)  
The input impedance is 20k ohm balanced or 10k ohm unbalanced. Both XLR and TRS  
inputs are connected with standard cables and can be changed quickly. Pinouts are  
marked on the rear panel. Do not attempt to connect more than one input signal to a  
given channel.  
Balanced connections are recommended to reduce AC hum and interference, espe-  
cially with long cable runs. Unbalanced connections may be suitable for short cables.  
The signal's source impedance should be less than 600 ohms.  
Input Pinouts  
Balanced inputs: Connect to the plug as shown.  
XLR  
TRS  
PLX 1104 and PLX 1804 models can parallel the input  
signal to both channels by using a jumper from one  
channel to the next:  
Connect the input signal to either of Channel 1s  
input connectors.  
Unbalanced inputs: Connect to the plug as shown. If using an XLR connector, Pin 3  
and pin 1 must be connected with a jumper as shown. If using a TRS connector, the  
ring and sleeve must be connected with a jumper. If a TS connector is used, the  
sleeve will provide the “jumper” when inserted into the input jack.  
Connect a jumper from Channel 1s unused con-  
nector to either of Channel 2s input connectors.  
Input signal  
XLR  
TRS  
TS  
TRS to TRS jumper from  
Channel 1 to Channel 2  
7
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PLX 1104 and PLX 1804 Output Connectors: Do  
not use less than 4 ohm impedance loads  
with PLX 1104 and PLX 1804 models.  
Outputs  
The PLX 1104 and PLX 1804 models are equipped with Speakon output  
connectors for each channel. PLX 1802, PLX 2502, PLX 3102, and PLX 3602  
models are equipped with Speakon and binding post output connectors.  
Wiring connections are shown on the back of the chassis. Carefully note  
the markings and maintain consistent loudspeaker polarity for optimum  
system performance.  
Speakon Output Connectors  
If making Speakon cables, be sure to connect the loudspeaker wiring as  
shown on the chassis. Channel 1s Speakon provides 4-wire (Ch 1 + Ch 2)  
connection; Channel 2s Speakon provides 2-wire (Ch 2 only) connection.  
Appendix A provides Speakon connection reference.  
Stereo and Parallel Mode: Connect each loudspeaker to its own chan-  
nel of the amplifier, as shown on the chassis label. The INPUT CONFIGU-  
RATION switch must be set for STEREO or PARALLEL mode.  
Bridge Mode (PLX1802/2502/3102/3602 models only): Use Channel 1s  
Speakon for Bridge mode output connection. Bridge mode configures the  
channel pair to drive a single high-power loudspeaker load. The INPUT  
CONFIGURATION switch must be set for BRIDGE mode. Use only Channel  
1s input and Gain control. Set Channel 2s Gain control at minimum.  
PLX 1802, PLX 2502, PLX 3102, and PLX 3602  
Output Connectors: Do not use less than 2 ohm  
impedance loads with these models.  
Binding Post Connectors (PLX 1802/2502/3102/3602  
models only)  
Stereo and Parallel Mode: Connect each loudspeaker to its own  
channel of the amplifier, as shown on the chassis label. The INPUT  
CONFIGURATION switch must be set for STEREO or PARALLEL  
mode.  
Bridge Mode: Bridge mode configures the channel pair to drive a  
single high-power loudspeaker load. The INPUT CONFIGURATION  
switch must be set for BRIDGE mode. Use only Channel 1s input  
and Gain control. Set Channel 2s Gain control at minimum.  
OUTPUT TERMINAL SAFETY WARNING! Do not touch  
output terminals while amplifier power is on. Make all  
connections with amplifier turned off. Risk of hazard-  
ous energy!  
8
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LED Indicators  
The LED indicators can be used to monitor system operation and identify common problems.  
LED indicators on PLX 1104 and PLX  
1804 models  
POWER (PWR): BLUE  
Normal indication:  
AC switch ON: LED will illuminate.  
If no indication:  
Check AC power cord and AC outlet.  
Confirm that AC switch is in ON position.  
CLIP: RED  
Normal indication:  
Illuminates whenever the amplifier is driven beyond full power. The resulting distortion corre-  
sponds to the brightness of the LED. Distortion that causes only brief flashing may not be audi-  
ble.  
During muting, the red LED fully illuminates. This occurs during normal "On-Off" muting.  
Abnormal indication:  
Bright red illumination while the amp is being used indicates either thermal muting or a shorted  
output.  
If the amplifier overheats, the fan will run at full speed, and operation should resume within  
one minute. Allow the fan to run, and make sure the amplifier ventilation is adequate.  
• A shorted or overloaded output circuit will cause excessive Clip flashing and possible overheat-  
ing.  
If distortion is audible without a Clip indication, the problem is either before or after the ampli-  
fier. Check for damaged speakers or overloaded signal source. The amplifier Gain control  
should be in the upper half of its range to prevent input overload.  
SIGNAL (SIG), -10: GREEN  
Normal indication:  
The SIG (signal) indicator illuminates when the input signal exceeds -35 dB, and the -10 (-10 dB)  
indicator illuminates when the signal exceeds -10 dB.  
LED indicators on PLX 1802, PLX 2502,  
PLX 3102, and PLX 3602 models  
If no indication:  
Check Gain settings and increase gain if necessary. Check input connections and audio source  
for signal. If the Clip LED illuminates with little or no Signal indication, check the output wiring  
for shorts.  
Abnormal indication:  
If the SIG or -10 LED illuminates with no signal input, there may be system oscillations or some  
other malfunction. Disconnect the load and fully reduce the gain. If the LED remains on, the  
amp may need servicing.  
BRIDGE MONO (BR M) and PARALLEL (PAR) (PLX 1802/2502/3102/3602 models only):  
Each channel pair has a AMBER LED for Bridge Mode, and a AMBER LED for Parallel mode.  
These show how the rear panel INPUT CONFIGURATION switch is set (see Input Configuration  
Switch). In Stereo mode, both LEDs should be OFF. In bridge mode the BR M indicator will be  
illuminated. In parallel mode, the PAR indicator will be illuminated.  
9
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Gain Controls  
Gain controls and LED cluster on PLX 1104 and  
PLX 1804 models  
Turn the GAIN controls clockwise to increase gain and  
counter clockwise to decrease gain.  
The GAIN controls are marked in dB of attenuation.  
There are 21 detents for repeatable adjustments. The  
upper 14 steps are about 1 dB each, and settings should  
normally be made within this range. The range below -  
14 dB should not be used for normal program levels, as  
the input headroom could be exceeded, but can be used  
for testing at reduced levels. At the minimum setting,  
the signal is completely cut off.  
Note! The GAIN controls do not adjust the  
power of the amplifier. They adjust its sensi-  
tivity to input signals.  
Gain controls and LED cluster on PLX 1802,  
PLX 2502, PLX 3102, and PLX 3603 models  
Power Switch  
Push in on the top of the rocker switch to apply AC mains  
power to the amplifier. Push in on the bottom of the rocker  
switch to turn the amplifier off.  
When turned on, the blue PWR indicator LED and the red  
CLIP indicator LED will illuminate; after a few seconds the  
red CLIP indicator will extinguish.  
10  
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Protection Systems  
Both amplifier platforms are fully protected against adverse conditions, but their behavior and user adjustments are different.  
PLX 1802/2502/3102/3602 models:  
Clip Limiting may be switched on the rear panel to prevent severe overdrive. This protects speakers and somewhat reduces  
the load on the amplifier.  
Internal current limits protect the output transistors against overloading. Peak limiting may occur at full output if using more  
than four 8-ohm speakers per channel, or if the speaker wiring is shorted. The red Clip LED will flash brightly, and the ampli-  
fier may sound distorted. If the amplifier is driven hard under these conditions, the current limit will be further reduced,  
causing an increase in distortion. If the amplifier appears to be losing power during peaks, check the speaker wiring and  
number of speakers. Using Clip Limiting will reduce this distortion, but for best results do not exceed the rated loading.  
If the amplifier stops completely for several seconds after a very loud signal, it may be overloading the AC service. This only  
occurs if the AC voltage sags more than 30%, and will be more likely if driving many speakers at once. Use short, heavy-  
gauge AC cables and do not plug too many amplifiers into a single outlet.  
In Bridge Mono, the amplifier may shut down for several seconds if driven too hard into loads less than the rated 4-ohm  
minimum.  
If the amplifier overheats due to prolonged overload or high external temperature, it will mute for about 30 seconds with the  
fan running at full speed for maximum cooling. Make sure the rear intake is getting a free flow of cool air.  
PLX 1104/1804 models:  
These models have completely automatic internal protection that maintains operation even under extreme conditions.  
Overdrive distortion will cause the red Clip LED to flash. If driven constantly into clipping, internal circuitry smoothly reduces  
the volume to minimize distortion and stress.  
These models are rated for 4-ohm loads. Do not use more than two 8-ohm speakers per channel. Using too many speakers  
may trigger limiting and cause a loss of volume.  
Internal current limits protect the output transistors against overloading. Moderate overloading will trigger clip limiting, and  
smoothly reduce output level to prevent distortion. Severe overloading, such as driving the amplifier hard into a shorted  
speaker wire, may cause short, rapid muting. Check the speaker wiring for shorts if the amplifier "chatters".  
Overheating may occur due to prolonged overdrive or high external temperature. This will first trigger thermal limiting,  
reducing volume so that the amplifier remains below its thermal limit and keeps running. If input signals are still too high,  
the amplifier may eventually mute for about 30 seconds with the fan at full speed for maximum cooling. Make sure the rear  
intake is getting a free flow of cool air.  
11  
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Specifications PLX 1104, PLX 1804  
PLX 1104  
PLX 1804  
(1)  
OUTPUT POWER (Watts)  
20 - 20k Hz, 0.05% THD, 8 ohms/Ch.  
1k Hz, 0.1% THD (EIA), 8 ohms/Ch.  
20 - 20k Hz, 0.05% THD, 4 ohms/Ch.  
1k Hz, 0.1% THD (EIA), 4 ohms/Ch.  
310  
325  
500  
550  
550  
600  
800  
900  
DISTORTION, SMPTE-IM  
FREQUENCY RESPONSE  
SIGNAL to NOISE, unweighted, 20 - 20k Hz  
VOLTAGE GAIN  
0.02%  
0.02%  
20 - 20k Hz, ±0.5 dB, all models  
-108 dB  
32.5 dB  
-106 dB  
34.9 dB  
INPUT SENSITIVITY, Vrms  
for rated power into 8 ohms  
1.18 (+3.7 dBu)  
1.20 (+3.8 dBu)  
AB/H  
OUTPUT CIRCUIT TYPE  
INPUT IMPEDANCE  
DYNAMIC HEADROOM  
DAMPING FACTOR (8 ohms)  
AMPLIFIER PROTECTION  
COOLING  
AB  
10k ohms unbalanced, 20k ohms balanced  
2 dB at 4 ohms  
>200  
Short circuit, open circuit, thermal, ultrasonic and RF protection. Stable into reactive or mismatched loads  
Continuously variable speed fan; back-to-front air flow through heat sink array  
CONTROLS  
Front: AC POWER switch, Gain controls (each channel) 21 detents  
Back:  
AC circuit breaker  
LED INDICATORS  
CONNECTORS  
POWER (blue), SIGNAL (green x 2), -10 dB (green x 2), CLIP (red x 2)  
Input: 1/4-inch TRS and female XLR; 20k ohm balanced, 10k ohm unbalanced  
Output: Speakon connectors: Ch 1, 4-wires (Ch 1 + Ch 2); Ch 2, 2-wires (Ch 2 only)  
LOAD PROTECTION  
POWER REQUIREMENTS  
DIMENSIONS  
Turn-on/turn-off muting, DC fault blocking, Clip limiting, Infrasonic filter (-3 dB at 5 Hz)  
Refer to rear panel serial number label. Configured at factory for 100, 120 or 220-240 VAC, 50- 60 Hz.  
19.0" (48.3 cm) W, 3.5" (8.9 cm) H, 10.1" (25.7 cm) D (from front mounting rails, including rear support  
ears)  
(1)  
WEIGHT  
13 pounds (5.9 kg) net; 18 pounds (8.2 kg) shipping  
(1) NOTE: Due to special construction to meet EN-6100, CE models may have 5-12% (0.5 dBw) less power and 1.2 lb (0.6 kg) more weight.  
U.S. patent no. 5767744 and patents pending  
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE  
12  
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Specifications PLX 1802, PLX 2502, PLX 3102, PLX 3602  
PLX 1802  
PLX 2502  
PLX 3102  
PLX 3602  
(1)  
OUTPUT POWER (Watts)  
20 - 20k Hz, 0.05% THD, 8 ohms/Ch.  
1k Hz, 0.1% THD (EIA), 8 ohms/Ch.  
20 - 20k Hz, 0.05% THD, 4 ohms/Ch.  
1k Hz, 0.1% THD (EIA), 4 ohms/Ch.  
1k Hz, 0.1% THD (EIA), 2 ohms/Ch.  
Bridge Mono, 20 - 20k Hz, 0.1% THD, 8 ohms  
Bridge Mono, 1k Hz, 0.1% THD, 8 ohms  
Bridge Mono, 1k Hz, 1.0% THD, 4 ohms  
320  
330  
525  
575  
425  
450  
675  
750  
1250  
1400  
1500  
2500  
550  
600  
900  
1000  
1550  
1900  
2100  
3100  
725  
775  
1100  
1250  
1800  
2500  
2600  
3600  
900  
1100  
1200  
1800  
DISTORTION, SMPTE-IM  
FREQUENCY RESPONSE  
SIGNAL to NOISE, unweighted, 20 - 20k Hz  
VOLTAGE GAIN  
<0.02%, all models  
20 - 20k Hz, ±0.5 dB, all models  
-107 dB  
31.9 dB  
-106 dB  
34.0 dB  
-107 dB  
35.0 dB  
-107 dB  
35.9 dB  
INPUT SENSITIVITY, Vrms  
for rated power into 8 ohms  
1.28 (+4.4 dBu)  
AB  
1.15 (+3.4 dBu)  
AB/H  
1.23 (+4.0 dBu)  
AB/H  
1.25 (+4.2 dBu)  
AB/H  
OUTPUT CIRCUIT TYPE  
INPUT IMPEDANCE  
DYNAMIC HEADROOM  
DAMPING FACTOR (8 ohms)  
AMPLIFIER PROTECTION  
COOLING  
10k ohms unbalanced, 20k ohms balanced  
2 dB at 4 ohms  
>500  
Short circuit, open circuit, thermal, ultrasonic and RF protection. Stable into reactive or mismatched loads  
Continuously variable speed fan; back-to-front air flow through heat sink array  
CONTROLS  
Front: AC POWER switch, Gain controls (each channel) 21 detents  
Back:  
Input Configuration Switch (Stereo, Parallel, Bridge), Clip Limiters (On/Off)  
Subwoofer Switch (100 Hz Low Cut/Full Range/100 Hz High Cut, each channel)  
LF Switch (33 Hz Low Cut/Full Range, 1 each channel)  
LED INDICATORS  
CONNECTORS  
POWER (blue), SIGNAL (green x 2), -10 dB (green x 2), CLIP (red x 2), BRDG (amber), PAR (amber)  
Input: 1/4-inch TRS and female XLR; 20k ohm balanced, 10k ohm unbalanced  
Output: Speakon connectors: Ch 1, 4-wires (Ch 1 + Ch 2); Ch 2, 2-wires (Ch 2 only)  
Binding posts  
LOAD PROTECTION  
POWER REQUIREMENTS  
DIMENSIONS  
Turn-on/turnoff muting, DC fault blocking, Clip limiting, infrasonic filter (-3 dB at 5 Hz).  
Refer to rear panel serial number label. Configured at factory for 100, 120 or 220-240 VAC, 50- 60 Hz.  
19.0" (48.3 cm) W, 3.5" (8.9 cm) H, 13.9" (35.3 cm) D (from front mounting rails, including rear support  
ears)  
(1)  
WEIGHT  
21 pounds (9.5 kg) net; 26 pounds (11.8 kg) shipping  
(1) NOTE: Due to special construction to meet EN-6100, CE models may have 5-12% (0.5 dBw) less power and 1.2 lb (0.6 kg) more weight.  
U.S. patent no. 5767744 and patents pending  
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE  
13  
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Appendix A: Speakon Wiring Reference  
Amplifier connection  
To loudspeaker  
Two-wire, single-channel connection  
Four-wire, two-channel connection  
NOTE! Ensure proper polarity when  
connecting bridge mode output!  
Bridge mode connection  
14  
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How to Contact QSC Audio Products  
Cómo comunicarse con QSC Audio Products  
Comment prendre contact avec QSC Audio Products  
Kontaktinformationen für QSC Audio Products  
联系 QSC Audio Products  
Mailing address:  
Telephone Numbers:  
Facsimile Numbers:  
World Wide Web:  
E-mail:  
QSC Audio Products, Inc.  
1675 MacArthur Boulevard  
Costa Mesa, CA 92626-1468 USA  
Main Number  
(714) 754-6175  
Sales & Marketing  
Customer Service  
(714) 957-7100 or toll free (USA only) (800) 854-4079  
(714) 957-7150 or toll free (USA only) (800) 772-2834  
Sales & Marketing FAX  
Customer Service FAX  
(714) 754-6174  
(714) 754-6173  
QSC Audio Products, Inc. 1675 MacArthur Boulevard Costa Mesa, California 92626 USA  
©2006 “QSCand the QSC logo are registered with the U.S. Patent and Trademark Office.  
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