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1. engineering Q Tech Commercial Series QTA6060M 6120M 6240M Mixer Amplifiers User Manual LI LI WARNING CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN IMPORTANT The wires in the mains lead are coloured In accordance with the following code Green and Yellow Earth E Blue Neutral N Live L As the colours of the wires in the mains lead of this apparatus may not correspond with the coloured markings identifying the terminals in your plug proceed as follows Brown The wire which is coloured green and yellow must be connected to the terminal which is marked with the letter N or coloured black The wire which is marked with the letter L or coloured red If a 13 Amp B S 1363 plug or any other type of plug is used a 5 Amp fuse must be fitted either in the plug or at the distribution board General Installation DO NOT run unbalanced high impedance microphone cables near mains data telephone or 70 100V line cables DO NOT run 70 100V line cable near data telephone or other low voltage cables DO NOT exceed 90 of the amplifiers output power when using 70 100V line speech only DO NOT exceed 70 of the amplifiers output power when using 70 100V line high level background music DO NOT use voice paging horn loudspeakers for background music unless the loudspeaker has been specifically designed for this purpose AVOID jointing the microphone cable when this is unavoidabl
2. cavities as the audio system Operation For the best noise performance turn the input level control to a high setting and use the Master as the volume control Use the other input level controls to set the required mixing ratios If you are using the auxiliary inputs adjust the bass and treble controls to get the desired sound The Q Tech range of amplifiers has a 7 stage LED ramp for Signal Present Overload green red Green indication occurs when there is a signal present This LED display should be glowing green when signal is present If this lamp is off the reason maybe A The Input may not be connected B There is little or no signal present at the moment C There is a Mic connected to a channel switched to LINE a D The Mic needs Phantom Power See Rear Panel Layout E The LEVEL control needs to be increased clockwise F The cable is not wired properly A red glowing LED indicates that the levels are so high that distortion due to clipping is occurring or imminent Check these conditions A The LEVEL control may be turned too high B The Output of the preceding device may need to be reduced C The Input may be switched to MIC with a line level source Switch the Input to LINE Q Tech Commercial Series User Manual QTA 6060M 6120M 6240M User Manual engineering Specifications Type Model Mains Voltage Suppl Ray Battery Voltage Output Power Outputs Inputs F
3. the meter s dial can be cross referenced with the meter s impedance chart to see what value should be expected and the power that will be required User Manual Q Tech Commercial Series Quest QTA 6060M 6120M 6240M E User Manual engineering High impedance of speakers and output calculation table for 100Volt systems Output Impedance Output Impedance Output Impedance 0 1W 100KQ 10W 1KQ 40W 2500 0 5W 20KQ 15W 6672 50W 2000 1W 10KQ 20W 5000 75W 1330 2W 5KQ 25W 4002 100W 1000 3W 3 33KQ 30W 3330 150W 66 70 5W 2KQ 35W 286Q 200W 50Q 100V plan P E x E Z 100x100 Z 10 000 Z P Power W Z Impedance 9 E 100V Designed voltage of a general use amplifier Q Tech Commercial Series User Manual QTA 6060M 6120M 6240M Quest User Manual Ie engineering User Manual Q Tech Commercial Series www questaudio net Quest Engineering Pty Ltd 86 Derby St Pascoe Vale VIC 3055 Ph 613 9354 9133 Fax 613 9354 9233
4. 120M 6240M User Manual Step 4 Continue this process until all the ceiling speakers are connected in a parallel connection with all the COM connections and all the wattage connections following a parallel connection Common problems with ceiling speaker installations System is distorting Check for the following causes 1 Too many speakers set to too high a power tapping for the power of the amplifier Solution Calculate the total power draw and re connect the speakers to a lower the wattage tapping See Determining power by calculating total impedance on page 10 Some cheap ceiling speakers have incorrect taping labels A 10 watt speaker may really be drawing 15 or 20 watts The only way to test this is with an impedance meter on a single speaker A 15 discrepancy can mean that a 100 watt system will only be able to power 7 or 8 x10 watt speakers safely Be aware of this booby trap Always plan to have 20 more power than you think you will need 2 Incorrect output connection If you ac cidentally connect your terminal strip on the amplifier to the 8 ohm output instead of the 100 70V line you will have distortion and risk damaging the amplifier 3 Short circuits and no circuits Check that your wiring has not been accidentally cut miss connected or generally damaged in the course of installation This can be common with building sites with multiple trades people installing equipment into the same ceiling
5. 50M TEL mutes all channels Channel 1 can mute Channel 3 5 Aux 3 6 88mm H x 426mm W x 13 5 D 9 5 ES Black Table top or 19 rack mountable Rack Mount Ears Included User Manual Q Tech Commercial Series engineering Trouble Shooting If the amplifier doesn t appear to be working normally please check the following No Power No indicator Lights working e Make sure amplifier power switch is on e Make sure mains power switch is on at the wall e Check the mains and DC fuse e Replace with only the correct type and rating Over rated fuses with invalidate warranty Distorted Output e Check that the speaker type is correct for the output that you are using ie 4 16Q 70V or 100V line e Check for any short circuits on the speaker line Very Low Output Volume e Make sure that the input is the correct level check for shorted connectors e Check for any short circuits on the speaker line e Check if signal LED on the front panel is lit to indicate there is signal e If it is not lit there is no signal present Continually Blows Fuses e Make sure that the speaker line is not shorted e Check speaker types ratings and if on correct output Amplifier Keeps on Cutting In amp Out e Make sure that there is adequate ventilation around the amplifier e Check the vent slots on the front top and sides are not covered or blocked and the fan on the rear is functioning correctly e Check als
6. N ie 100 oo 200 2 Gl ya ms pe o ele 100 OO ojo E Q 1 Mains Input Socket 13 MIC 4 Aux 4 Selector Switch 25 Chime Selector Switch 2 Power Fuse 14 Aux 4 Input RCA Jack 26 Chime Screw Terminal 3 Earth Connection Screw 15 Aux 3 Input RCA Jack 27 Speaker Output Terminals 4 Power Amp in 16 MIC 3 Aux 3 Selector Switch 28 DC Power Supply Terminals 5 Pre out RCA Jack 17 MIC 3 Input XLR Jack 29 MIC 5 Screw Terminal input 6 Tape Output RCA Jack 18 MIC 2 Input XLR Jack 30 MIC 4 Screw Terminal input 7 Aux 6 Level Control 19 MIC 2 Aux 2 Selector Switch 31 MIC 3 Screw Terminal input 8 Aux 6 Input RCA Jack 20 Aux 2 Input RCA Jack 32 MIC 2 Screw Terminal input 9 Aux 5 Input RCA Jack 21 Aux 1 Input RCA Jack 33 MIC 1 Screw Terminal input 10 MIC 5 Aux 5 Selector Switch 22 MIC 1 Aux 1 Selector Switch 34 Tel Page Input Screw Terminals 11 MIC 5 Input XLR Jack 23 MIC 1 Input XLR Jack 35 Tel Input Level Control Mains Voltage 115V 240V 12 MIC 4 Input XLR Jack eee 36 MIC 1 Mute On Off Switch User Manual Q Tech Commercial Series engineering QTA 6060M 6120M 6240M User Manual Power Source The supply transformer has been designed for use on either 115Vac or 240Vac selected by a slide switch on the rear panel The amplifier is factory set at 240Vac mains voltage Battery Connection 24V DC When using external batteries earth the ampl
7. Under normal conditions up to three power amplifiers can be connected in this way Loudspeaker Connection Note Use only 100V or 70V Selectable Line Loudspeakers engineering Low Impedance 82 or 40 This output allows connection of standard low impedance loudspeakers The minimum impedance must be 49 When two or more loudspeakers are in use ensure that they are wired in such a way that the impedance load is between 4Q and 16Q As a guide for the correct gauge of wire we recommend the following AWG25 26 Upto sae 0 15mm2 AWG20 100V 50m 200m 0 5mm2 AWG18 Over 200m 0 75mm2 AWG24 UbltoiSom 0 20mm2 AWG17 70V 50m 200m 1 0mm AWG16 Over 200m 1 5mm2 AWG18 Up to 10m 0 75mm2 Low Imped 4 10m 30m AGE 2 50mm2 Installation Practice Step 1 Take a piece of figure 8 cable connect the stripe coloured wire to the100V 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 speaker transformer and the other strip wire to the required voltage taping Step 3 Take a second piece of figure 8 cable and connect the plain wire to the parallel COM connection and the other stripe wire to the parallel output from the transformer terminal block and connect it in the same way to the next ceiling speaker User Manual Q Tech Commercial Series engineering QTA 6060M 6
8. ables Phantom power facilities are provided either of the mic inputs can be configured to operate with 15V phantom power by setting the relevant jumper to the ON position Care should be taken to ensure that phantom power is activated only when the microphone connected to the input requires external phantom power In addition to the XLR microphone inputs the option exists for installing Microphones via the barrier strip provided VOX Muting The TEL input has voice activated VOX priority muting over CH1 CH5 and AUX 6 Priority Microphone Mic1 input has VOX priority over CH 3 6 and Line input signals but does NOT mute Channel 2 input El Line Aux CD Connection The equipment provides an auxiliary input which may be used for connecting other signal sources such as a Radio Tuner CD or Cassette player A push button switch is located on the rear panel for selection of Mic1 Aux1 Mic2 gt Aux2 etc The line level Control on the front panel operates on each of the input sources To operate select the desired music source using the slide switch and turn the Channel control clockwise to increase the volume or anti clockwise to reduce the volume The Aux input sockets are standard stereo RCA phono Single sockets are supplied and these are linked together internally This allows stereo signal sources to be used without the need to obtain a special lead however you may wish to check with the manufacturer of t
9. e make sure a good screened connector is used ALWAYS use balanced low impedance microphone cable terminating to balanced inputs on long cable runs ALWAYS use a mains grade double insulated cable for the loudspeaker cable runs when 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 Quest QTA 6060M 6120M 6240M E User Manual engineering Contents Introduction 52sec cede anna ee eee SO 2 Description ooo sc nn nn 2 Front Panel Layout eee eee nn nn nn 3 Rear Panel Layout sssssunmnmsuuus 4 Power Source cc eee eee 5 Main Connections 5 Power Amp Output 0000c eee eee eee 6 Q Installation Practice 6 Operation 000 eee eee nn nn nn nn 7 Specifications 00000c eee eee ee 8 Trouble Shooting s s s s ssss 9 Technical Notes ooo o 9 Q Tech Commercial Series User Manual QTA 6060M 6120M 6240M User Manual 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
10. he signal source to ensure that no damage will result if the left and right output channels are put in parallel Q Tech Commercial Series User Manual QTA 6060M 6120M 6240M User Manual RCA Phono Plug Connections cel DO PIN SLEEVE Sleeve Screen Pin Signal Tape Output Connection These are standard RCA stereo phono sockets and provide a mixed output suitable for connection to a tape or digital recorder Pre Out Aux Out The horseshoe jumper U connects the mixer preamplifier stage to the power amplifier stage This Insert Point will allow for connection of signal processors such as equalisers compressors or Feedback Exterminators The Insert Point is located electronically between the mixer and power amplifier sections of the amplifier It allows for the mixed output of 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 control Chime Output Chime is a two tone DING DONG This is obtained by shorting screw terminals Chime tones mute all channels A slide switch located adjacent to the speaker output terminal strip allows the enable disable Chime function Power Amp Output Additional amplification can be achieved by connecting the PRE OUT 2 output to another power amplifier
11. ifier via the screw terminals on the rear of the amplifier because of the high voltages present Electrical stability of the system will be improved by providing a good earth ground NOTE the connection cable must be fitted with an in line fuse Quick blow type 5A 60W 8A 120W 15A 240W When connecting batteries please ensure correct polarity Main Connections Microphone Inputs Five microphone inputs are provided the microphone amplifiers are an electronically balanced transformer less design configured for optimum low noise performance The input impedance is greater than 2kQ and is suitable for microphones in the 200Q to 600Q range For balanced microphones connect the cable screen to pin 1 the in phase signal to pin 2 and the reverse phase to pin 3 To operate the channel in the unbalanced mode connect pin 3 to pin 1 ground inside the XLR cable plug Use pin 2 as hot and pin 1 as screen ground see diagram below Pin Assignments Viewed from Solder Side of Plug Soceket Plug Socket Balanced Audio 3 pole XLR Pin 1 Ground Screen Pin 2 In phase ve Hot Pin 3 Out of phase ve Cold Unbalanced Audio 3 pole XLR Pin 1 Ground Screen Pin 2 Signal Pin 3 Ground Screen connect to pin 1 For best performance when using long lines between microphones mixer and or amplifier use balanced lines These have the effect of cancelling out any noise or hum that may be induced into the c
12. o speaker types ratings and for any short circuits on the speaker line No Output Volume e Check the Send Return link is in place QTA 6060M 6120M 6240M User Manual Technical Notes Constant Voltage Distributed Speaker Systems Demystified In a typical paging and background music speaker installation a quantity of loudspeakers are placed across a single amplifier in a parallel wiring configuration see Fig 1 Each ceiling speaker will contain a small transformer and you will notice that the connection block near the transformer will have a common terminal C or earth anda number of wattage terminals Connect the wattage setting terminal for the desired acoustic output volume level you need from each individual speaker This will be a 100V setting in Europe and most of Asia and 70V in the USA See the explanation below 100V Line Public Address System LOI Remote Speaker with 100V Line Transformers From 100V Amplifier Line Fig 1 Often some speakers need to be set at different volume output levels and the calculations involved in determining the actual load impedance at the amplifier s output can be quite involved but there is a simple technique for not overloading the amplifier As for the amplifiers there are two common standards 100 Volt line in Europe and Asia and 70 Volt line on the American continent For the purpose of simple calculations we will use the European standard for this e
13. requency response Total harmonic distortion Signal to noise ratio Tone Controls Controls Indicators AC power consumption DC power consumption Phantom power Priority Dimensions H x W x D mm Weight Colour Mounting options QTA 6060M Mixer Amplifier QTA 6120M AC 115V 240V 50 60Hz 10 Switchable DC 24V MAX 10 deviation 60W 120W 240W Speaker outputs 402 8Q 70V 100V Tape output 1V 4 7KQ Pre output 1V 60002 Aux Mains Power 4A 115V Mic 1 5 sensitivity Adjustable 1mV 600Q balanced Aux 4 6 150mV stereo 22K TEL 150mV Adjustable 60002 balanced Power amplifier in 1V Mic 1 Mic 5 60Hz 12KHz 3dB Aux 1 6 50Hz 15KHz 3dB TEL 50Hz 15KHz 3dB Less than 1 1KHz rated power All Volume Controls 80dB below rated power Mic 1 5 60dB below rated power Tel 80dB below rated power Aux 80dB below rated power Bass 10dB at 100Hz Treble 10dB at 10KHz Channel 1 5 volume control Aux 6 volume control Master volume control Tone controls Bass Treble TEL volume control Mute slide switch Mic 1 Aux 1 push switch Rear Mounted Mic 2 Aux 2 push switch Rear Mounted Mic 3 Aux 3 push switch Rear Mounted Mic 4 Aux 4 push switch Rear Mounted Mic 5 Aux 5 push switch Rear Mounted Chime Control AC 115V 240V voltage Selector switch Power indicator LED output level indicators 6 LEDS 150W 300W 600W 5A 8A 15A Factory set on 16V defeatable via internal jumpers QTA 62
14. s Mic or Line The Mixer amps can also drive up to three external power amps User Manual Q Tech Commercial Series Quest QTA 6060M 6120M 6240M Es User Manual engineering Front Panel Layout Quest Qtech QTA 6060M PUBLIC ADDRESS AMPLIFIER L Bee engineering oo000m CHANNEL 1 CHANNEL 2 CHANNELS CHANNEL 4 CHANNEL 5 TREBLE MASTER POWER ara 938 o 0 1 Channel 1 Volume Control 7 Master Tone Control Treble 2 Channel 2 Volume Control 8 Master Volume Control 3 Channel 3 Volume Control 9 Power On Off switch 4 Channel 4 Volume Control 10 Power On Off indicator LED 5 Channel 5 Volume Control 11 Output Level indicator LED 3 6 Master Tone Control Bass Q Tech Commercial Series User Manual QTA 6060M 6120M 6240M Quest User Manual Fr engineering Rear Panel Layout E vouraceserecr Le Yoov roy bagon o a 06 Fa m 18 1 gieeeeeeee Bee Ae B re pren fout ue ae om men RS ae ET Ti men TN
15. 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 Also check that the voltage is correct for your local power supply engineering Description The Q Tech Range of Mixer amplifiers are of very high quality and come supplied full of features e In built chime tone module Phantom Power on all mic inputs Telepaging input with selectable priority 24v DC power inputs Built in Mic Line Priority Low Signal to Noise ratio Complete with barrier strip XLR or Ya in jack Mic input connections Pre Out function Tape Output External Mixer input All Mic inputs selectable a
16. tts and thus plenty of headroom One watt difference is not very noticeable as far as output sound pressure level in concerned A system that does not distort will give much clearer voice reproduction than a louder system that is distorting or loosing the sibilant frequencies There is a formula for testing the potential power of the system by measuring the impedance of each speaker and then adding all the figures to a total impedance which is then compared to the amplifier s expected impedance power figures engineering The quick way is to just add up all the wattages and then give yourself 10 20 headroom by reducing the number of speakers per amplifier or lowering the wattages slightly For the benefit of those who want to calculate the power of the system with a formula 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 formula is Power 5000 Impedance because 70 squared equals 5000 To measure impedance a dedicated meter is required These use a 1k frequency to send an alternating current through the transformer s The resulting figure indicated by
17. xercise On the rear of a 70 100V amplifier you will find an output terminal strip This terminal strip will contain a number of voltage outputs 70V 100V and a terminal at one end for the negative return wire COM a Q Tech Commercial Series User Manual QTA 6060M 6120M 6240M User Manual A low impedance terminal will be for 8 ohm speaker installations and is under no circumstances to be connected to a transformer type 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 similar problem would be trying to draw 2 000 watts from a 1 000 watt generator Sooner or later Expect a system failure Let us take a 100 watt amplifier If you have 20 speakers and you set them at the 5 watt taping you will have a total 100 watt draw which is the maximum output of the amplifier This is correct in theory but in practice you will be safer connecting 18 speakers not 20 The reason is that most ceiling speakers draw more than their claimed wattage The alternative would be to connect the speakers to the 4 watt transformer terminal giving you a theoretical total draw of 80 wa

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