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QTA-

1120P/1240P

 

User Manual

User Manual

Q-Tech Commercial Series

QTA-1120P/1240P

2

Introduction

Congratulations on your purchase of a new 
Q-Tech Commercial series amplifier. Quest 
Engineering Q-Tech Series amplifiers are 
engineered and built to a standard that will 
satisfy the most demanding environments of 
commercial installation audio.

For your safety and continuing reliability of 
your Quest amplifier, please read all the safety 
instructions and familiarize yourself with the 
amplifiers functions and installation procedure 
section before installing and operating the 
amplifier. Quest has paid great attention 
to detail in order to maintain strict quality 
assurance standards of all Q-Tech Series 
amplifiers.

It follows that if your audio installation is 
completed with the same attention to detail, 
your amplifier will deliver its best results. 
Please red the section: 

Constant Voltage 

Distributed Speaker Systems Demystified .

Unpacking:

 Please inspect the amplifier 

carefully immediately after unpacking. If 
you find any damage, notify your supplier/
dealer immediately. Only the shipper may file 
a damage claim with the carrier for damage 
incurred during shipping.

Description

QTA series of Power Amplifiers cover 
models from 120W RMS to 480W RMS.  This 
manual is to for 120W QTA-1120P and 240W 
QTA-1240P.

•  Easy to use booster Amplifier

•  7 step LED Ramp for signal presence

•  XLR and phone jack input 

•  Rear mounted Input gain control

•  Parallel/Mono selection for the use 

of additional power amplifiers

•  Rear mounted switch for selection 

of 100mV or 1v sensitivity

•  8 ohm, 70V and 100V speaker output

•  XLR and phone jack output

•  Overload, over temperature, and 

speaker short protection.

•  115v-240v AC and 24v DC power in

•  2U height

•  19” rack or table mounted 

Rack ears supplied.

•  3 year replacement warranty.

Содержание Q-Tech QTA1120P

Страница 1: ...Q Tech Commercial Series QTA1120P 1240P Power Amplifiers User Manual PUBLIC ADDRESS AMPLIFIER QTA 1240P OUTPUT LEVEL 8 Pwr 10 8 3 0 3 POWER ...

Страница 2: ...run in conduit together with power cables ENSURE that all loudspeakers are in phase ENSURE that there are no short circuits on the loudspeaker line before connecting to the amplifier It is also advisable to check the final impedance to the amplifier with a dedicated impedance meter to determine power draw is within the amplifiers limits IMPORTANT The wires in the mains lead are coloured In accorda...

Страница 3: ... Manual Q Tech Commercial Series QTA 1120P 1240P 1 Contents Introduction 2 Description 2 Front Panel Layout 3 Rear Panel Layout 3 Power Source 4 Installation Practice 5 Operation 5 Trouble Shooting 6 Specifications 6 Technical Notes 7 ...

Страница 4: ...n to detail your amplifier will deliver its best results Please red the section Constant Voltage Distributed Speaker Systems Demystified Unpacking Please inspect the amplifier carefully immediately after unpacking If you find any damage notify your supplier dealer immediately Only the shipper may file a damage claim with the carrier for damage incurred during shipping Description QTA series of Pow...

Страница 5: ... Supply Terminal 12 MIC 4 Aux 1 Selector Switch 6 Speaker Output Terminal 13 Phone Jack Input 7 Phone Jack Output Front Panel Layout PUBLIC ADDRESS AMPLIFIER QTA 1120P OUTPUT LEVEL 8 Pwr 10 8 3 0 3 POWER 1 2 3 VOLTAGE SELECT AC 115 240V 50 60Hz FUSE 250V T5A 24V DC COM 8Ω 70V 100V CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN CAUTION TO PREVENT ELECTRIC SHOCK DO NOT REMOVE COVER OR BACK NO USER SERVI...

Страница 6: ...nto the cables the amplifier to be processed externally and then returned to the power amplifier section of the amplifier The connecting link must be plugged in for normal operation as a mixer amplifier PRE OUT is after the tone controls and the master volume 100V Up to 50m AWG25 26 0 15mm2 50m 200m AWG20 0 5mm2 Over 200m AWG18 0 75mm2 70V Up to 50m AWG24 0 20mm2 50m 200m AWG17 1 0mm2 Over 200m AW...

Страница 7: ...nother amplifier When it is connected to another amplifier put the switch on Parallel position to maintain maximum gain Installation Practice Step 1 Take a piece of figure 8 cable connect the stripe coloured wire to the 100V terminal and the uncoloured wire to the COM on the amplifier terminal strip Step 2 Connect the other end of the wire uncoloured to the Com EARTH connection on the ceiling spea...

Страница 8: ...ually Blows Fuses Make sure that the speaker line is not shorted Check speaker types ratings and if on correct output Amplifier Keeps on Cutting In Out Make sure that there is adequate ventilation around the amplifier Check the vent slots on the front are not covered or blocked and the fan on the rear is functioning correctly Check also speaker types ratings and for any short circuits on the speak...

Страница 9: ... speaker system How to calculate the correct number of speakers and what wattage connection for a given amplifier power If you connect too many speakers to an amplifier you will have distortion overheating of the amplifier and generally poor performance The problem is not really too many speakers it is more a problem of too much wattage draw exceeding the output capability of an amplifier A simila...

Страница 10: ...ula See below Determining power by calculating total impedance The alternative to counting the speaker taping watts is to calculate the total impedance of the line which will also indicate the wattage necessary to drive the system correctly The computational formula is voltage squared divided by impedance Power Voltage2 Impedance When the speaker line reaches its top voltage of 70 Volts the formul...

Страница 11: ......

Страница 12: ...www questaudio net Quest Engineering Pty Ltd 86 Derby St Pascoe Vale VIC 3055 Ph 613 9354 9133 Fax 613 9354 9233 ...

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