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QTA-

4060P/4120P

User Manual

User Manual

Q-Tech Commercial Series

QTA-4060P/4120P

3

CAUTION

An all-pole mains switch with a contact separation of at least 3 mm in each pole shall be 
incorporated in the electrical installation of the building.

When Installing the Unit

Never plug in nor remove the power 

• 

supply plug with wet hands, as doing so 
may cause electric shock.

When unplugging the power supply cord, 

• 

be sure to grasp the power supply plug; 
never pull on the cord itself. Operating the 
unit with a damaged power supply cord 
may cause a fire or electric shock.

When moving the unit, be sure to remove 

• 

its power supply cord from the wall 
outlet. Moving the unit with the power 
cord connected to the outlet may cause 
damage to the power cord, resulting in 
fire or electric shock. When removing the 
power cord, be sure to hold its plug to 
pull.

Do not block the ventilation slots in the 

• 

unit’s cover. Doing so may cause heat to 
build up inside the unit and result in fire.

Avoid installing the unit in humid or dusty 

• 

locations, in locations exposed to direct 
sunlight, near heaters, or in locations 
generating sooty smoke or steam as doing 
otherwise may result in fire or electric 
shock.

When the Unit is in Use

Do not place heavy objects on the unit 

• 

as this may cause it to fall or break which 
may result in personal injury and/or 
property damage. In addition, the object 
itself may fall off and cause injury and/or 
damage.

Make sure that the volume control is set 

• 

to minimum position before power is 
switched on. Loud noise produced at high 
volume when power is switched on can 
impair hearing.

Do not operate the unit for an extended 

• 

period of time with the sound distorting. 
This is an indication of a malfunction, 
which in turn can cause heat to generate 
and result in a fire.

Contact your dealer as to cleaning. If dust 

• 

is allowed to accumulate in the unit over a 
long period of time, a fire or damage to the 
unit may result.

If dust accumulates on the power supply 

• 

plug or in the wall AC outlet, a fire may 
result. Clean it periodically. In addition, 
insert the plug in the wall outlet securely.

Switch off the power, and unplug the 

• 

power supply plug from the AC outlet for 
safety purposes when cleaning or leaving 
the unit unused for 10 days or more. Doing 
otherwise may cause a fire or electric 
shock.

Summary of Contents for Q-Tech QTA-4060P

Page 1: ...Q Tech Q Tech Commercial Series QTA 4060P 4120P 4 Channel Power Amplifiers User Manual ON OFF CH1 CH2 CH3 CH4 PROT PEAK SIGNAL POWER QTA 4060P PUBLIC ADDRESS AMPLIFIER ...

Page 2: ...tents Safety Precautions 1 General Description 4 Features 4 Front Panel Layout 5 Rear Panel Layout 6 Connections 7 Applications 8 Block Diagram 9 Specifications 10 Dimensional Diagram 11 Technical Notes 12 ...

Page 3: ...ety Symbol and Message Conventions Safety symbols described below are used in this manual to prevent bodily injury and property damage which could result from mishandling Before operating your product read this manual first and understand the safety symbols and messages so you are thoroughly aware of any risks Indicates a potentially hazardous situation which if mishandled could result in death or...

Page 4: ... metallic objects or flammable materials in the ventilation slots of the unit s cover as this may result in fire or electric shock When Installing the Unit Do not expose the unit to rain or an environment where it may be splashed by water or other liquids as doing so may result in fire or electric shock Use the unit only with the voltage specified on the unit Using a voltage higher than that which...

Page 5: ...o direct sunlight near heaters or in locations generating sooty smoke or steam as doing otherwise may result in fire or electric shock When the Unit is in Use Do not place heavy objects on the unit as this may cause it to fall or break which may result in personal injury and or property damage In addition the object itself may fall off and cause injury and or damage Make sure that the volume contr...

Page 6: ...res Rated outputs from 60W and 120W 24V DC interface 100V 70V line transformer isolated speaker outputs low impedance 4 ohms speaker outputs Four independent amps in a single chassis Four line level inputs Commercial grade torroidal transformers produce high performance audio on a wide range of frequencies An Intelligent limiter can reduces excess signal Reliable protection against overload short ...

Page 7: ...H3 Volume 5 Channel volume control CH3 Volume 6 Channel volume control Signal CH1 CH2 CH3 CH4 7 Signal indicator LED When lit input signal is detected Peak CH1 CH2 CH3 CH4 8 Peaking indicator LED Protect CH1 CH2 CH3 CH4 9 Protection indicator LED When lit amplifier is in protection mode Turn off amplifier and check for short circuit in speaker wiring or excessive speaker load ON OFF CH1 CH2 CH3 CH...

Page 8: ...tie short the G and terminals together Inputs 3 6 Channel volume control For wiring unbalanced inputs tie short the G and terminals together Inputs 2 7 Channel volume control For wiring unbalanced inputs tie short the G and terminals together Inputs 1 8 Channel volume control For wiring unbalanced inputs tie short the G and terminals together 24V DC interface 9 AC FUSE 10 240VAC POWER INPUT 11 BAT...

Page 9: ... Ω 70V 100V terminals cannot be used at the same time Impedances indicated in the figures represent the total speaker system load impedances WARNING Be sure to attach the supplied terminal cover after connection completion Because high voltage is applied to the speaker terminals never touch these terminals to avoid electric shocks ...

Page 10: ...QTA 4060P 4120P User Manual User Manual Q Tech Commercial Series QTA 4060P 4120P 8 Applications QTA 4060P QTA 4120P Rear Panel Connections ...

Page 11: ...QTA 4060P 4120P User Manual User Manual Q Tech Commercial Series QTA 4060P 4120P 9 Block Diagram ...

Page 12: ...ance 200 1 Input Sensitivity 775mV 0dB Frequency Response 50Hz 16KHz distortion 1 5Db S N Ratio 15V microsecond T H D 1 Cool Method Copulsive Wind Cool Form Indicators Signal Protection Peaking Protection Power on Overload and Protection Power Requirements 240V Hz 24V DC Optional Power Consumption 360W 720W Dimension mm 484X477X132 Net Weight 23KG 26KG Gross Weight 24KG 27KG Specifications ...

Page 13: ...ual User Manual Q Tech Commercial Series QTA 4060P 4120P 11 Dimensional Diagram UNIT mm UNIT mm Keep all the unit s sides over 10cm away from objects that may obstruct air flow to prevent the unit s internal temperature rising ...

Page 14: ...0V and a terminal at one end for the negative return wire COM 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 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 Co...

Page 15: ...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 watts 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 reproduc...

Page 16: ...KΩ 10W 1KΩ 40W 250Ω 0 5W 20KΩ 15W 667Ω 50W 200Ω 1W 10KΩ 20W 500Ω 75W 133Ω 2W 5KΩ 25W 400Ω 100W 100Ω 3W 3 33KΩ 30W 333Ω 150W 66 7Ω 5W 2KΩ 35W 286Ω 200W 50Ω 100V plan P E x E Z 100x100 Z 10 000 Z P Power W Z Impedance Ω E 100V Designed voltage of a general use amplifier High impedance of speakers and output calculation table for 100Volt systems ...

Page 17: ...QTA 4060P 4120P User Manual User Manual Q Tech Commercial Series QTA 4060P 4120P 15 ...

Page 18: ...QTA 4060P 4120P User Manual User Manual Q Tech Commercial Series QTA 4060P 4120P 16 ...

Page 19: ...QTA 4060P 4120P User Manual User Manual Q Tech Commercial Series QTA 4060P 4120P 17 ...

Page 20: ...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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