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PRO-SERIES
POWER AMPLIFIERS
Item ref: 172.031UK, 172.032UK, 172.034UK, 172.035UK
User Manual
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Caution: Please read this manual carefully before operating
Damage caused by misuse is not covered by the warranty
Introduction
Thank you for choosing the QTX PRO series power amplifiers as part of your sound reinforcement system.
These amplifiers are designed to offer high quality, dependable service for mobile and installed systems.
Please read this manual fully and follow the instructions to achieve the best results with your new purchase
and to avoid damage through misuse.
Warning
To prevent the risk of fire or electric shock, do not expose any of the components to rain or moisture.
If liquids are spilled on the casing, stop using immediately, allow unit to dry out and have checked by qualified
personnel before further use. Avoid impact, extreme pressure or heavy vibration to the case
No user serviceable parts inside – Do not open the case – refer all servicing to qualified service personnel.
Safety
Check for correct mains voltage and condition of IEC lead before connecting to power outlet
Ensure speaker leads are good condition with no short connections or damaged plugs
Check impedance of speaker loads do not exceed the minimum stated load for the amplifier
Do not allow any foreign objects to enter the case or through the ventilation grilles
Placement
Keep out of direct sunlight and away from heat sources
Keep away from damp or dusty environments
When rack-mounting, ensure adequate support for the base of the amplifier and firm fixings for the front
Ensure adequate air-flow and do not cover cooling vents at the front and rear of the amplifier
Ensure adequate access to controls and connections
Cleaning
Use a soft cloth with a neutral detergent to clean the casing as required
Use a vacuum cleaner to clear ventilation grilles of any dust or debris build-ups
Do not use strong solvents for cleaning the unit
Unpacking
Your QTX PRO series amplifier should arrive in good condition with the appropriate mains IEC lead(s)
If any contents are missing or damaged, contact your dealer immediately.
PRO240/480/600/1000 User Manual
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Layout
1.
Cooling vents – do not cover
9.
Right (R) channel speaker output (4mm posts)
2.
LED VU meters
10.
L+R speaker outputs (6.3mm jack)
3.
Left (L) channel gain control
11.
Right (R) channel speaker output (4mm posts)
4.
Power on/off switch
12.
Right (R) channel speaker output (SPK)
5.
Right (R) channel gain control
13.
L+R line inputs (6.3mm jack)
6.
IEC mains inlet and fuse holder
14.
L+R line inputs (RCA)
7.
Voltage selector
15.
Cooling fan – do not cover
8.
Right (R) channel speaker output (SPK)
Operation
Connect speaker cabinets to speaker outputs (8, 9, 10, 11, 12) using good quality leads and ensure that the
combined load on each channel is no lower than 4Ω (for speaker loads connected in parallel, 8Ω + 8Ω = 4Ω)
Connect each signal input from mixer or other line level source via the jack (13) or RCA (14) connectors on
the rear panel using good quality signal leads. The jack and RCA inputs are wired in parallel, so whichever is
not used for the input signal can be used to connect onto further amplifier inputs.
Connect the amplifier to the mains outlet, making sure that the IEC lead is earthed, in good condition and
connected securely. Ensure the correct voltage is selected on the rear panel voltage selector (7)
With channel gain controls (3, 5) turned fully down, switch the power switch (4) on.
With mixer (or other signal source) levels turned down, gradually increase the amplifier’s channel gain controls
to the required level (normally full) and then gradually increase the signal level from the mixer or sound
source until sound can be heard through the speakers and then continue increasing up to the required level.
During use, the VU LEDs (2) will illuminate to show the volume level. If the “0dB” LEDs illuminate more than
very briefly, reduce the volume until they hardly light up at all. This will avoid distortion or “clipping” through
the speakers.
Before powering down, turn the channel gain controls fully down to avoid loud noises when switching off.
PRO240/480/600/1000 User Manual
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Specifications
PRO240
PRO480
PRO600
PRO1000
Power supply
230Vac, 50Hz
Fuse rating
T2A/T4A (240V/110V)
T5A (240V) / T10A (110V)
Power max: 4Ω
2 x 120W
2 x 240W
2 x 300W
2 x 500W
Power rms: 4Ω
2 x 60W
2 x 120W
2 x 150W
2 x 250W
Power rms: 8Ω
2 x 40W
2 x 80W
2 x 100W
2 x 160W
Freq.response
20Hz - 20kHz
Input connectors
2 x RCA / 2 x 6.3mm jack
Input sensitivity
775mV, 10k ohms
Min. impedance
4Ω
Speaker outputs
SPK connectors / 6.3mm jacks / 4mm Binding Posts
S/N ratio
>98dB
THD
<0.5%
Dimensions
482 x 240 x 88mm
482 x 300 x 88mm
482 x 300 x 88mm
482 x 380 x 88mm
Weight
5.2kg
6.45kg
7.35kg
9.0kg
No power light on front
panel switch
Ensure IEC inlet is connected to mains and lead is in good condition
Ensure mains outlet is switched on
Power light is on but no
other LEDs and no output
Check input signal and connection leads
Ensure channel gain controls are not turned fully down
Power light and Signal
LEDs are lit but no output
Check speakers are in good working order and not shorted (use a multi-tester)
Check speaker leads are in good condition and connected properly
If speakers/leads OK, switch off again and refer to qualified service personnel
Case getting hot
Ensure cooling vents are clear and fan is working (refer to technician if not)
Output is very distorted
and “CLIP” LEDs are
lighting
Check the speaker impedance is not below rated Ohms
Turn down the input level from audio source
Turn down channel gain controls
Output is working but at
very low level
Ensure input source is at line level
Increase input level from audio source
Turn up channel gain controls
Disposal: The “Crossed Wheelie Bin” symbol on the product means that the product is classed as Electrical or
Electronic equipment and should not be disposed with other household or commercial waste at the end of its useful life.
The goods must be disposed of according to your local council guidelines.
Troubleshooting
Errors and omissions excepted.
Copyright© 2013. AVSL Group Ltd.
PRO240/480/600/1000 User Manual
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