Peavey Stereo Amplifier LT Series User Manual

LT/ST Power Amplifier  
Owner’s Manual  
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table of contents  
p.2  
how to use this manual  
1
p.3  
introduction  
p.5  
installation  
2 unpacking  
mounting  
cooling and ventilation  
powering  
maintenance  
p.9  
features overview  
3 front panel  
rear panel  
p.15  
operation modes  
4 stereo  
contents  
parallel  
bridged  
p.17  
connections  
5
input  
output  
p.21  
safety  
6 tourclass protection  
precautions  
user responsibility  
p.25  
service and support  
support  
7
contact us  
registration  
p.27  
specifications  
a
b
c
appendices  
p.28  
block diagram  
p.29  
wire gauge charts  
p.1  
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how to use this manual  
LT / ST owner’s manual  
1
conventions  
terms  
official Crest Audio features and  
each indicator or control on the amplifier will appear as: terms  
actions  
specific actions or selections the user can execute will appear as: actions  
tasks  
are broken down into steps 1  
2
3
warnings  
Procedures not to attempt.  
a
Issues or hazards to keep in  
mind when operating  
the equipment.  
indicators  
What to look for on  
®
the equipment display.  
Alerts, indicators, or  
prompts that may appear.  
tips  
Preferred methods.  
Helpful hints.  
Feature insights.  
+
see  
see—refers to other sections of the manual containing  
supplementary information on the current topic or a related issue  
note  
notesupplementary feature information  
p.2  
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introduction  
1
welcome  
Congratulations on your purchase of a new LT / ST Series professional power amplifier and thank you for your con-  
fidence in Crest Audio products.You are among the growing number of audio professionals who have made Crest  
Audio one of the world’s leading suppliers of professional and commercial/industrial audio systems.  
For your safety, please read the Important Precautions section before installing and operating the amplifier.The Crest  
Audio LT and ST Series amplifiers are designed for high operating efficiency and accurate sonic performance across  
the full audio bandwidth, even under stressful conditions.  
The CrestAudio LT and ST series both utilize Class D amplifier technology which greatly improves the efficiency of  
the amplifier and reduces the power demand from the mains supply.The LT amplifier incorporates a linear power  
supply whereas the ST uses a resonant switching supply with power delivery characteristics similar to a linear sup-  
ply but with greatly reduced weight. Both power supply designs are built to the same uncompromising standards.  
This, combined with major advances in amplifier technology provides for extreme reliability and sonic accuracy for  
which Crest products are renown.  
The Crest audio LT series and ST series amplifiers differ in power supply design,electrical efficiency and weight how-  
ever, their feature sets are identical. For this reason, the majority of this users manual applies to both models.  
LT linear-toroid power supply  
A traditional linear power supply is used in the LT Series. Because of the amplifier sections efficiency, (approx  
93%) the transformer does not need to be as big or as heavy.This gives the LT Series an advantage in deliver-  
ing more power in a more compact package.  
The efficiency of the output stage also gives the power supply the ability to handle heavy-duty cycles without  
compromising sonic integrity.  
ST resonant-switching power supply  
The ST amplifier switching power supply employs a resonant design which utilizes zero-power switching  
technology.  
Benefits of resonant-switching include:  
reduced power component stress for  
better reliability and efficiency  
20dB lower noise than conventional switching supplies  
(and therefore more EMC friendly)  
behaves like a classic linear supply, but with the added  
advantages of size and weight reduction  
In order to maintain strict quality assurance standards,all CrestAudio power amplifiers are built in our state-of-the-  
art USA manufacturing facility. Internal components are the finest available and key sub-assemblies are pre-tested  
before final assembly. Each amplifier is burned inand thoroughly tested (using precision audio test equipment)  
®
before shipping. In addition, all LT / ST Series amplifiers incorporate Crests exclusiveTourClass protection features  
to safeguard both internal circuitry and connected loudspeakers.  
This proven combination of advanced design,quality construction and comprehensive circuit protection is your guar-  
antee of fail-safe reliability. You can depend on consistent, stable performance even when your LT / ST Series ampli-  
fier is subjected to punishing extremes in the most demanding fixed or mobile sound reinforcement applications.  
p.3  
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installation  
2
/
/
/
/
/
what to do with the shipping carton  
proper rack-mounting technique  
keeping the amplifier cooled  
required AC line voltages  
unpacking  
mounting  
cooling and  
ventilation  
routine maintenance practices  
powering  
maintenance  
p.5  
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installation  
LT / ST owners manual  
2
unpacking  
Please inspect the amplifier carefully immediately after unpacking. If you find any dam-  
For replacement  
packaging, call Crest  
Audios  
Customer Service  
Department directly.  
age, notify your supplier/dealer immediately. Only the shipper may file a damage claim  
with the carrier for damage incurred during shipping. Be sure to save the carton and  
all packing materials for the carriers inspection.  
+
If the packing materials are in good condition, please save them.  
If you ever need to ship the unit anywhere without mounting it in a rack, you should  
take advantage of the original factory packing materials in order to avoid unnecessary  
damage.  
seeservice and support  
mounting  
All LT / ST Series amplifiers mount in standard 19-inch racks and occupy two rack  
spaces. Four front-panel mounting holes are provided on each amplifier. Rear mount-  
ing ears give additional support and use of rear supports is highly recommended in all  
mobile and touring sound systems. Handles are fitted standard.  
LT shown. ST has the same dimensions  
front  
height  
3.47"/  
88 mm  
front width 19"/483mm  
LT / ST shown  
rear width 17"/432mm  
front  
height  
3.47"/  
88mm  
depth14"/356mm  
p.6  
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installation  
2
cooling and ventilation  
LT / ST amplifiers use a forced air cooling system to maintain a low,even operating tem-  
perature.  
Make certain that there  
is enough space around  
the front and rear of the  
amplifier to allow the  
heated air to escape.  
When mounting in a rack,  
try to avoid using doors  
or covers on the front  
and rear of the enclosure;  
the exhaust air must not  
be impeded  
a
Air is drawn in by a DC fan on the rear panel, flows through the cooling fins and then  
exhausts through the front panel vent.  
Heat sink temperature is monitored and controls the variable speed fan. Fan speed  
increases only as required, keeping fan noise to a minimum.  
suggestion  
In racks with closed backs  
allow at least one stan-  
dard-rack-space opening  
for every four amps.  
If the heat sink surpasses its maximum allowed temperature, the thermal protection  
circuit will activate and open the output relays allowing the amplifier to cool to a safe  
temperature. To continue using the amp,it must be reset by turning the power off and  
then turning it back on again.  
Thermal protect activation only occurs under extreme thermal conditions and is not  
part of normal operation.  
powering  
Unless otherwise specified when ordered, LT / ST amplifiers are supplied factory set  
to following voltage options :  
Option 1 US domestic  
nominal 120Vac 60Hz for rated power output  
(safe operating range 100 - 132Vac )  
Option 2 export models nominal 230Vac 50Hz for rated power output  
(safe operating range 200 - 264Vac )  
note  
Due to the nature of the switching power supply in the ST, 50 - 60Hz operation is acceptable for both  
options.  
maintenance  
LT / ST amplifiers require no routine maintenance.  
If the amplifier is used in an extremely dusty or smoky environment , the unit should  
be periodically blown free ( using compressed air ) of any foreign matter that may have  
built up inside the unit.  
Users will not need to make any adjustments to the amplifier during its lifetime.There  
are no user-serviceable parts or adjustments that require opening the amplifier.  
p.7  
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features overview  
3
/
/
location of connectors and controls  
legend of panel symbols  
front panel  
rear panel  
p.9  
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features overview  
LT / ST owners manual  
3
LT / ST shown  
2
1
3 4 5 6 7  
8
8
9
1
2 3 4 5 6 7  
9
p.10  
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features overview  
3
front panel  
Rack Mounting Ears  
1
Two front-panel mounting holes are provided on each mounting ear.  
Channel Level attenuators  
2
Two input attenuators adjust level for their respective amplifier  
channels. In Bridged Mono and Parallel modes, the channel A  
attenuator controls overall signal level (see rear panel mode switch  
description).  
Protect  
3
This Red LED indicates that the amp channel is in Protect mode.  
During Power up, the amp briefly goes into protect mode in order  
to prevent any loud spikes from being fed the speakers. After a few  
seconds the amp comes out of protect mode and is ready for  
normal operation. If the amp stays in Protect mode, this indicates  
that there may be a problem internal to the amp. If the amp goes  
into Protect mode during operation this indicates that either a  
problem has developed internal to the amp or the amp is being  
over-stressed and needs to cool down. After a Protect condition, the  
amp must be reset by cycling the power off and then on again in order  
to continue using it.  
ACL / IGM  
4
5
This Red LED illuminates when either the ACL or IGM protection  
circuitry is engaged. See Section 6,Tourclass Protection for more  
information on these Crest-exclusive features.  
-24, -18, -6, 0dB  
The first three LEDs (-24, -18, -6,) are Green and the last led, 0dB is  
yellow. These LEDs respond to the incoming program material as peak  
meters. Under normal operating conditions the Green LEDs illuminate  
with the dynamics of the program material and theYellow LEDflashes  
during the loudest peaks.  
Signal  
6
7
Green LED varies in intensity in response to signals below -24 dB.  
Active  
Green LED illuminates when the amp is on to show that the channel  
is active.  
Fan Outlet Grill  
8
LT & ST Series amplifiers are cooled by a single rear-mounted fan.  
Cool air flows over the heat sink and exhausts through the front grill.  
Make sure this outlet remains clear to allow unrestricted airflow.  
9 Power switch  
This switch turns the amp on and off. If the amp doesnt turn on when  
the switch is in the ON position, check the circuit breaker on the rear  
panel.  
p.11  
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LT / ST shown  
6
2
3
4
5
1
7
rear panel legend  
rear panel  
input connection  
IEC power connector  
1
XLR connector polarity  
TRS connector polarity  
Accepts a standard IEC terminated power cable  
Breaker  
2
bridged mono mode  
parallel mode  
Resettable circuit breaker - no fuses are used. Breaker can trip due to  
a power surge or over-voltage condition. If it trips once, reset it. If it  
continues to trip, the amplifier may need servicing.  
stereo mode  
Fan  
3
chassis ground lifted-position  
The fan operates continuously while the amp is on. An internal  
temperature sensor increases the speed of the fan during high  
temperature conditions. Air enters through the rear of the  
amp and exits through the front grill. Be sure to allow adequate air  
flow from the rear of the rack the amp is mounted in.  
chassis ground grounded-position  
output connection  
speakon output  
channel A stereo/parallel  
channel B stereo/parallel  
bridged mono  
five-way binding post  
channel A stereo/parallel  
bridged mono  
channel B stereo/parallel  
p.12  
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features overview  
3
rear panel  
Output connections  
4
Speakers can be connected via the high current binding posts and  
the industry-standard Speakon (NL-4) connectors.  
Binding posts: One pair (Red- hot, Black- ground) per channel.  
Speakons - One connector for each channel. In Bridged Mono  
mode, the Speakon connector for Channel A is used exclusively  
(see Operation Modes).  
Never connect a hot  
(red) output to ground  
or to another hot (red)  
output!  
a
Ground lift switch  
5
The recessed two-position ground lift switch is used to isolate the  
amps signal ground from the chassis/AC ground.The factory default  
setting is to the right, Grounded.To lift, or disconnect the signal  
ground from the chassis/AC ground, slide the switch to the left.  
In situations where chassis ground must be lifted, use this switch -  
never lift the ground prong on the AC connector.  
In situations where an UNBAL-  
a
ANCED signal is fed to the amp, its  
important to ground the unused  
input. If the inverting (-) input of an  
amp channel is left floating, the chan-  
nels gain will drop by 6 dB. In effect,  
the amp will not be as loud. For more  
information about this, ask your dealer  
or contact Crest AudioTechnical  
Support directly.  
Input connections  
6
7
Input signals can be connected to the amp via the Phoenix connec-  
tors, the 1/4TRS connectors and the Female XLR (pin 2 hot) con-  
nectors. Input sensitivity is .775v (0 dBv) for full rated output  
power. See Connections  
Mode selector switch  
Do not adjust the mode  
a
selection switch while  
This recessed, three position switch configures the amplifier for  
Stereo, Parallel or Bridged Mono operation. The default factory  
setting is Stereo. See - operation modes.  
the amplifier is turned-on.  
p.13  
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operation modes  
4
/
/
/
choosing the appropriate mode  
stereo  
switching between operation modes  
special considerations when using bridged mode  
parallel  
bridged  
p.15  
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operation modes  
LT / ST owners manual  
4
mode selection  
The three-position,recessed Mode Select switch (located on the rear panel)  
configures the amplifier for Stereo, Parallel or Bridged mode. Amplifiers are  
factory-configured for Stereo mode. Shut the amp off before changing  
modes.  
stereo  
In Stereo mode,both channels operate independently,with their input atten-  
uators controlling their respective levels.Signal at ChannelAs input produces  
output at Channel As output,while signal at Channel Bs input produces out-  
put at Channel Bs output.Recommended minimum nominal load impedance  
for stereo operation is 2 Ohms per channel.  
parallel  
When set to Parallel mode, program material applied to Channel As input  
will appear at both Channel A and B outputs.The attenuator for Channel A  
controls the level for both A and B outputs.  
bridged  
Bridged mode straps both amplifier channels together to make a single-  
channel monaural amplifier. One channel pushes and the other pulls equally,  
increasing the power output over that of either channel alone  
(see Specifications). Signal is applied to the Channel A input only. Channel  
As attenuator is used to control signal level.  
Use extreme caution when operating the amplifier in Bridged mode. Never  
ground either side of the speaker cable when the amplifier is in Bridged  
mode; both sides are hot.”  
If an output patch panel is used, all connections must be isolated from each  
other and from the panel.The recommended minimum nominal load imped-  
ance in the Bridged mode is 4 ohms, which is the equivalent to driving both  
channels separately at 2 ohms.  
Connecting amplifier  
outputs to oscilloscopes  
seeconnections for examples of mode-specific wirings  
a
or other test equipment  
while the amplifier is  
in bridged mode may  
damage both the amplifier  
and test equipment!  
p.16  
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connections  
5
/
/
speakon  
proper wiring schemes for connectors:  
input  
binding post  
XLR 1/4TRS  
correct signal paths: stereo, parallel and bridged  
output  
Phoenix 3 pin  
p.17  
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connections  
LT / ST owners manual  
5
inputs  
LT / ST amplifiers are configured standard with pin 2 hot on XLR inputs.  
female XLR  
TRS pinouts  
3-pin Phoenix (view of connector on rear of amp)  
In + In - Com  
outputs  
Speakers are connected using the high-current five-way binding posts  
or speakon connectors, or both.  
Very high current is  
a
available at the outputs.  
bridged mono  
stereo/parallel  
Please connect your  
output cable to the + and  
- terminals of each sec-  
tion precisely as shown.  
Speaker + to PIN 1+  
Speaker - to PIN 2+  
Speaker + to PIN 1+  
Speaker - to PIN 1-  
seeoperation modes  
p.18  
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connections  
5
stereo mode  
five-way binding post connectors  
parallel mode  
five-way binding post connectors  
bridged mono mode  
five-way binding post connectors  
p.19  
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connections  
LT / ST owners manual  
5
stereo mode  
speakon output connectors  
parallel mode  
speakon output connectors  
bridged mono mode  
speakon output connectors  
Speaker + to PIN 1+  
Speaker - to PIN 2+  
p.20  
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safety  
6
/
/
/
the owners role in amplifier safety  
protecting your speakers  
user  
responsibility  
description of TourClass protection features  
speaker  
protection  
TourClass  
p.21  
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safety  
user responsibility  
LT / ST owners manual  
6
Your LT / ST Series amplifier is very powerful and can be potentially dangerous to loud-  
speakers and operators alike. It is your responsibility to read important precautions  
(see the inside-front cover) and make sure that the amplifier is installed, wired, and  
operated properly as instructed in this manual.  
Many loudspeakers can be easily damaged or destroyed by overpowering, especially  
with the high power available from a bridged amplifier.Always be aware of the speak-  
ers continuous and peak power capabilities. Crest Audio is not responsible for damage  
to loudspeakers for any reason.  
seespeaker protection  
speaker protection  
All loudspeakers have electrical, thermal and physical limits which must be observed to pre-  
vent damage or failure.Cone or compression drivers can be damaged (sometimes to the point  
of failure) from excessive power, low frequencies applied to high frequency drivers, severely  
clipped wave forms,and DC voltage. All LT / ST Series amplifiers automatically protect speak-  
ers from DC voltages and subsonic signals.  
seeTourClass protection  
Mid- and high-frequency transducerscompression drivers in particularare highly suscep-  
tible to damage from overpowering,clipped wave forms,or frequencies below their rated pass  
band.When using an electronic crossover,make absolutely certain that the low and mid bands  
are connected to the correct amplifiers and driversand not accidentally connected to those  
for a higher or lower frequency band.  
The amplifiers clipping point is its maximum peak output power. At maximum peak output  
power,CrestAudio LT / ST Series amplifiers will deliver more power than many speakers can  
safely handle. Be sure the peak power capability of the amplifier is not excessive for your  
speaker system.To ensure that the speakers never receive excessive power, and to prevent  
amplifier clipping,use a properly adjusted external limiter (or a compressor with a ratio of 10:1  
or higher) to control power output. Use one compressor/limiter for each frequency band in  
systems with active electronic crossovers.  
The ACL clip limiting circuit will automatically limit the duration of squared-off, continuous  
wave forms applied to the speakers.The amplifier will,however,allow normal musical transient  
bursts to pass. Of course, when the amplifier does clip, it is operating at its maximum output  
power.Note that some speaker systems are packaged with proprietaryprocessorsthat have  
power limiting circuits and therefore should not require additional limiting. Do not drive any  
low-frequency speaker enclosure with frequencies lower than its own tuned frequency; the  
reduced acoustical damping could cause a ported speaker to bottom out even at moderate  
power.Consult the speaker system specifications to determine its frequency limits,and employ  
a roll-off filter if necessary.  
recommended speaker cabling  
The wire gauge charts will assist you in determining the optimum copper wire gauge for your  
speaker cables.Remember that the speaker cable resistance robs amplifier power in two ways:  
through power lost directly to resistance (often referred to as I2R loss),and through increased  
total load resistance, which decreases the amount of power available from the amplifier.  
Appendix C gives cable length figures in feet/AWG wire gauges and in metric values.  
seewire gauge  
p.22  
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safety  
6
®
TourClass protection  
Just like Crest Audios highly acclaimed Pro series amps, LT and ST amps incorporate  
TourClass protection features. Derived from Crest Audios extensive experience with the  
worlds largest sound rental companies, the TourClass group of circuits sets the industry  
standard for assured protection of internal amplifier circuits and all connected loads.  
ACL ACTIVE CLIP LIMITING  
At the amplifiers full power limit, or clipping point, ACL will be activated.This is indicated  
by illumination of the ACL / IGM LED.The channel gain is automatically reduced, protecting  
the loudspeakers from potential damage from the high power,continuous square waves that  
would otherwise be produced. ACL may be activated by uncontrolled feedback, oscillations,  
improper equipment gain settings, or an equipment malfunction upstream from the amplifi-  
er. Only steady or excessive clipping (not normal program transients) will trigger ACL. The  
circuit is virtually transparent in operation and full signal bandwidth is maintained.  
IGM INSTANTANEOUS GAIN MODULATION  
IGM is an innovative circuit that allows the amplifier to operate safely into loads as low as 2  
ohms.When the amplifier sees a load that overstresses the output stage,the IGM circuit adjusts  
the channel gain to a safe level. This gain control circuit is inaudible in normal use. In addition,  
if extreme and sustained low impedance is encountered,the amplifiers output relay will open.  
AutoRamp  
Auto Ramp operates every time the amplifier is turned on or is reactivated after a protect  
condition is corrected.This exclusive CrestAudio feature gradually increases gain to the atten-  
uator setting avoiding unnecessary stress on the loudspeakers.  
Thermal Protect  
Abnormally high heat sink temperatures will engage the Protect circuit and disconnects the  
output relays. During this time the Prot LEDs will light red.The cooling fan will continue run-  
ning at high speed. Normal operation resumes once the amplifier cools to a safe level.  
Short Circuit  
If an output is shorted (i.e. defective speakers or crossed speaker wires) the channel will shut-  
down and can be re-set by turning the amplifier off, then on.  
DC Voltage  
If an amplifier channel detects DC voltage at its output terminals, the output relay will immediately  
open to prevent loudspeaker damage. The protect LEDs illuminate.  
Subsonic Frequencies  
Built-in high pass filtering provides subsonic frequency protection for each channel.In addition,  
at the output.  
a relay will open if excessive subsonic energy appears  
p.23  
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service and support  
7
/
/
when to get support  
support  
ways to contact Crest Audio  
contact us  
p.25  
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service and support  
LT / ST owners manual  
7
support  
In the unlikely event that your amplifier develops a problem, it must be  
returned to an authorized distributor, service center or shipped directly to  
our factory.  
To obtain service, contact your nearest Crest Audio Service Center,  
Distributor, Dealer, or any of the worldwide Crest Audio offices. For those  
with Internet access, please visit the Crest Audio web site.  
contact us  
customer service  
phone 201.909.8700 USA  
fax  
201.909.8744 USA  
email customerserve@crestaudio.com  
technical support  
phone 201.909.8700 USA  
fax  
201.587.0550 USA  
email techserve@crestaudio.com  
web site  
For replacement  
packaging, call Crest  
Audios Customer Service  
+
mail  
Crest Audio Inc.  
16-00 Pollitt Drive  
Fair Lawn, NJ 07410 USA  
p.26  
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specifications  
a
LT / ST  
1000  
1500  
2000  
1kHZ, 0.5%THD+N  
Stereo power 8280W  
4500W  
400W  
750W  
900W  
1500W  
1800W  
64 rms  
550W  
1000W  
1200W  
2000W  
2400W  
72 rms  
2650W  
Bridged mono power 81000W  
41300W  
Maximum output voltage rms each channel 53 rms  
Frequency response 1W @ 820Hz–20kHz, +0 / - 1dB  
20Hz–20kHz, +0 / - 1dB  
20Hz–20kHz, +0 / - 1dB  
400:1 @ 8,  
20Hz–20kHz, +0 / - 1dB  
20Hz–20kHz, +0 / - 1dB  
400:1 @ 8,  
Power bandwidth @ rated power 20Hz–20kHz, +0 / - 1dB  
Damping Factor 400:1 @ 8Ω  
Input cmrr 60dB @ 1 kHz  
Input sensitivity for full rated output power .775V  
Input impedance 20K balanced 10K unbalanced  
60dB @ 1 kHz  
60dB @ 1 kHz  
.775V  
.775V  
20K balanced 10K unbalanced  
20K balanced 10K unbalanced  
Hum and noise -100dB, A-weighted below rated power  
-100dB, A-weighted below rated power  
-100dB, A-weighted below rated power  
Crosstalk -55dB @ 1kHz below rated power  
-55dB @ 1kHz below rated power  
D
-55dB @ 1kHz below rated power  
D
Class  
D
Circuit breaker rating 120Vac 10A  
Circuit breaker rating 230Vac 6A  
15A  
10A  
4A  
20A  
12A  
5A  
Current draw 1/8 power, 4120Vac 3A  
Current draw 1/3 power, 4120Vac 6A  
8.5A  
0.6A  
10A  
0.6A  
0.6A  
Current draw idle 120Vac  
Thermal emissions 1/3 Power, 4Ω, BTU/HR 1240  
Cooling Back to front via variable speed fan  
1630  
1960  
Back to front via variable speed fan  
Back to front via variable speed fan  
Input connectors, per channel Female XLR pin 2+, stereo 1/4” TRS  
Female XLR pin 2+, stereo 1/4” TRS  
jack socket, 3 pin Phoenix Combicon  
Female XLR pin 2+, stereo 1/4” TRS  
jack socket, 3 pin Phoenix Combicon  
jack socket, 3 pin Phoenix Combicon  
Output connectors Speakon connectors and 5 way binding post Speakon connectors and 5 way binding post Speakon connectors and 5 way binding post  
Controls Front panel: two attenuators power switch. Rear panel: signal ground-lift, mode select thermal circuit breaker (all models)  
LED indicators ACL, IGM, protection  
5 segment bargraph VU  
ACL, IGM, protection  
5 segment bargraph VU  
meter, active AUTORAMP  
ACL, IGM, protection  
5 segment bargraph VU  
meter, active AUTORAMP  
meter, active AUTORAMP  
TourClass protection ACL, IGM, AUTORAMP. SHORT CIRCUIT  
ACL, IGM, AUTORAMP. SHORT CIRCUIT  
DC VOLTAGE TURN ON/OFF TRANSIENT  
ACL, IGM, AUTORAMP. SHORT CIRCUIT  
DC VOLTAGE TURN ON/OFF TRANSIENT  
DC VOLTAGE TURN ON/OFF TRANSIENT  
CURRENT IN-RUSH, SUB / ULTRASONIC INPUT CURRENT IN-RUSH, SUB / ULTRASONIC INPUT CURRENT IN-RUSH, SUB / ULTRASONIC INPUT  
Construction 16 gauge steel chassis  
16 gauge steel chassis  
89mm x 483 x 388mm  
16 gauge steel chassis  
height x width x depth  
Dimensions 3.5” x 19” x 15.25”  
Weight net LT 30lb  
32.5lb  
23lb  
35lb  
23lb  
net ST 22.5lb  
p.27  
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block diagram  
LT / ST owners manual  
b
Channel A  
Inputs  
Channel A  
Outputs  
Phoenix  
Combicon  
5-Way  
Binding Posts  
Neutrik  
Speakon  
A
ATTENUATOR  
1/4”  
TRS  
1
Female  
3-Pin XLR  
3
OUTPUT RELAY  
OUTPUT STAGE  
2
Channel B  
Inputs  
Channel B  
Outputs  
Phoenix  
Combicon  
5-Way  
Binding Posts  
Neutrik  
Speakon  
B
ATTENUATOR  
1/4”  
TRS  
C
B
A
1
MODE SWITCH  
3
Female  
3-Pin XLR  
OUTPUT RELAY  
OUTPUT STAGE  
A: STEREO  
B: PARALLEL  
C: BRIDGE  
2
SEE SECTION 5 FOR  
OUTPUT CONNECTION DETAILS  
p.28  
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wire gauge  
c
stranded cable length  
wire gauge  
0.3mm2  
power loss  
2load  
8load  
4load  
2meters  
2.9%  
5.6%  
10.8%  
0.5  
0.75  
1.5  
2.5  
4.0  
1.74  
1.16  
0.58  
0.35  
0.22  
3.4  
6.7  
2.3  
4.5  
1.16  
0.70  
0.44  
2.3  
1.39  
0.87  
5meters  
0.5mm2  
0.75  
1.5  
2.5  
4
4.3%  
2.9  
8.2%  
5.6  
15.5%  
10.8  
5.6  
1.45  
0.87  
0.55  
0.37  
2.9  
1.74  
1.09  
0.73  
3.4  
2.2  
6
1.45  
0.5mm2  
0.75  
1.5  
2.5  
4
8.24%  
5.6  
5.5%  
10.8  
5.6  
28%  
19.9  
10.8  
6.7  
meters  
10  
2.9  
1.74  
1.09  
0.73  
2.9  
1.74  
1.09  
4.3  
6
2.9  
0.75mm2  
15.5%  
8.2  
0.73%  
15.5  
9.8  
45%  
28  
meters  
30  
1.5  
2.5  
4
5.1  
18.2  
12.0  
8.2  
3.2  
6.3  
6
2.2  
4.3  
10  
1.31  
2.6  
5.1  
p.29  
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c
wire gauge  
LT / ST owners manual  
stranded cable length  
wire gauge  
power loss  
2Ω load  
3.2%  
8Ω load  
0.81%  
4Ω load  
1.61%  
18AWG  
feet  
5
16  
14  
12  
10  
0.51  
0.32  
0.20  
0.128  
1.02  
0.64  
0.40  
0.25  
2.0  
1.28  
0.80  
0.51  
18AWG  
16  
1.61%  
1.02  
0.64  
0.40  
0.25  
3.2%  
2.0  
6.2%  
4.0  
feet  
10  
40  
80  
14  
1.28  
0.80  
0.51  
2.5  
12  
1.60  
1.01  
10  
18AWG  
6.2%  
4.0  
11.9%  
7.7  
22%  
14.6  
9.6  
feet  
16  
14  
12  
10  
8
2.5  
5.0  
1.60  
1.01  
0.60  
3.2  
6.2  
2.0  
4.0  
1.20  
2.4  
18AWG  
11.9%  
7.7  
22%  
14.6  
9.6  
37%  
26  
feet  
16  
14  
12  
10  
8
5.0  
17.8  
11.8  
7.7  
3.2  
6.2  
2.0  
4.0  
1.20  
2.4  
4.7  
p.30  
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http://www.crestaudio.com LT/ST Owner's Manual Version 1.3 03/21/02  
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