Q-SERIES
POWER AMPLIFIERS
Item ref: 172.051UK, 172.052UK, 172.054UK, 172.055UK
User Manual
Version 1.1
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 Q 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 the 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 a power outlet
- Ensure speaker leads are in 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 airflow 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 Q 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.
Layout
| 1. Cooling vents – do not cover 2. LED Clip indicators 3. Channel gain controls 4. Power on/off switch and LED 5. LED Signal indicators 6. IEC mains inlet and fuse holder 7. Voltage selector | 8. SPK speaker outputs 9. 4mm binding post speaker outputs 10. 6.3mm jack speaker outputs 11. L+R line inputs (6.3mm jack) 12. L+R line inputs (RCA) 13. Cooling fan – do not cover |
Operation
Connect speaker cabinets to speaker outputs (8, 9 or 10) 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 the mixer or other line-level source via the jack (11) or RCA (12) 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) turned fully down, switch the power switch (4) on.
With mixer (or another 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 the sound can be heard through the speakers and then continue increasing up to the required level.
During use, the Signal LEDs (5) will illuminate to show that the signal is present. If the Clip LEDs (2) 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.
Specifications
| Q240 | Q480 | Q600 | Q1000 | |
| Power supply | 110/240Vac, 50/60Hz | |||
| 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 |
Troubleshooting
| 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 the fan is working (refer to the technician if not) |
| Output is very distorted and CLIP LEDs are lighting | Check the speaker impedance is not below the rated Ohms |
| Turn down the input level from the audio source | |
| Turn down channel gain controls | |
| Output is working but at a very low level | Ensure input source is at line level |
| Increase input level from the 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 of 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.
Errors and omissions excepted. Copyright© 2021.
AVSL Group Ltd. Unit 2-4 Bridgewater Park, Taylor Rd. Manchester. M41 7JQ
AVSL (EUROPE) Ltd, Unit 3D North Point House, North Point Business Park, New Mallow Road, Cork, Ireland
