QA1000 - Receiver Qtx - Free user manual and instructions

Product Type	Power Amplifier (Receiver)
Model	QA1000 (172.025UK)
Brand	QTX
Form Factor	19" Rackmount (2U)
Dimensions (H x W x D)	88 x 482 x 340 mm
Weight (unpacked)	9.1 kg
Output Power (RMS) per Channel @ 4Ω	250 W
Output Power (RMS) per Channel @ 8Ω	170 W
Output Power (Max) per Channel @ 4Ω	500 W
Output Power (Max) per Channel @ 8Ω	340 W
Input Connectors	Combo XLR/6.3mm jack (per channel), RCA L+R
Output Connectors	Speaker sockets, 6.3mm jack, binding posts
Cooling	Fan cooled
Protection	Overload protection, Clip/Protect LEDs
Power Supply	Mains via IEC connector, replaceable fuse
Minimum Impedance	4 Ω per channel
Front Panel Controls	Power switch, Channel A+B level attenuators
Indicator LEDs	Signal, Clip, Protect
Maintenance	Clean with lint-free dry/damp cloth; keep vents clean
Safety	No user serviceable parts; refer to qualified personnel

Frequently Asked Questions - QA1000 Qtx

What is the power output of the QA1000?

The QA1000 delivers 250W RMS per channel at 4Ω and 170W RMS per channel at 8Ω. Maximum output is 500W (4Ω) and 340W (8Ω) per channel.

What type of inputs does the QA1000 have?

It features combo XLR/6.3mm jack inputs for each channel and RCA L+R inputs for convenient connection.

What speaker impedance can I use?

The minimum impedance per channel is 4Ω. For 8Ω speakers, connect them in pairs to each channel.

How do I connect the amplifier to speakers?

Use the speaker sockets, 6.3mm jack, or binding posts on the rear panel. Ensure the total impedance is not below 4Ω per channel.

What does the PROTECT LED indicate?

The PROTECT LED lights up when the amplifier enters protection mode due to overload, short circuit, or overheating. If lit, refer to qualified service personnel.

Why is there no output from the amplifier?

Check the mains power and fuse, verify all connections, ensure the PROTECT LEDs are off, and test speakers with another amplifier.

How can I reduce distorted sound?

Reduce the input signal level and ensure the amplifier output does not exceed the speaker's maximum rating. Gradually increase the input while keeping the signal clean.

How do I clean the QA1000?

Use a lint-free dry or slightly damp cloth to clean the case. Keep the ventilation grille and cooling fan free from debris.

Can I mount the QA1000 in a rack?

Yes, it is a 19-inch rackmount unit with a 2U height. Ensure proper ventilation when installed.

What is the warranty and service policy?

There are no user serviceable parts inside. For any servicing issues, refer to qualified service personnel.

USER MANUAL QA1000 Qtx

QA Series Power Amplifiers

QA400 (172.020UK)

QA1000 (172.025UK)

QA1600 (172.030UK

QA2400 (172.018UK)

• 19" Rackmount (2U)
• High power output
- Combo XLR/6.3mm jack and RCA inputs
- Speaker, 6.3mm jack and binding-post outputs
- Fan cooled
- Output circuit overload protection
- Mains powered via IEC connector

SPECIFICATIONS

	QA400	QA1000	QA1600	QA2400
Output Max per channel @ 4Ω	200W	500W	800W	1200W
Output RMS per channel @ 4Ω	100W	250W	400W	600W
Output Max per channel @ 8Ω	140W	340W	540W	840W
Output RMS per channel @ 8Ω	70W	170W	270W	420W
Dimensions	88 x 482 x 270mm	88 x 482 x 340mm	88 x 482 x 340mm	88 x 482 x 340mm
Weight (unpacked)	6.8kg	9.1kg	12.3kg	15.4kg

INTRODUCTION

Thank you for purchasing this QTX Sound QA-series power amplifier.

This product is intended to give long term, reliable service in normal usage.

Please read these instructions before use to avoid incorrect operation and outline the functions and controls.

FRONT PANEL

(1) VENTILATION GRILLE - Do not cover or restrict airflow
(2) CHANNEL A+B LEVEL - Attenuate output levels
(3) INDICATOR LEDS - Show signal present, clipping or protect mode
(4) POWER SWITCH - Switches mains power on/off

REAR PANEL

(5) COOLING FAN - Do not cover or restrict airflow
(6) IEC MAINS INLET - Check voltage and connect to mains with supplied lead
(7) MAINS FUSE - to replace fuse, disconnect mains & open with screwdriver
(8) OUTPUT SECTION – Connect speakers using speaker sockets, jack or binding posts
(9) INPUT SECTION – Connect mixer or other audio source via combo XLR/jack or RCA L+R

CONNECTION EXAMPLE

• Check mains for correct voltage as indicated near to the IEC mains inlet on the rear panel. Connect to mains supply using the IEC cable provided.
• Connect the outputs A+B to speakers via speaker connectors, jack or binding posts, ensuring that the minimum impedance is no lower than 4Ω per channel
• When using 8Ω speakers, connect the speakers in pairs to each other and then connect one of each pair to an amplifier channel output.
• Connect the mixer or audio source to either the combo or RCA input sockets
• With channel A+B levels down, switch the power on.
• Gradually increase channel levels and check for sound from speakers.
• If there is no sound, turn down channel levels, switch off and disconnect mains and check connections – if front panel PROTECT LEDs are lit, refer to qualified service personnel.

MAINTENANCE

No user serviceable parts inside, refer all servicing issues to qualified service personnel.

Clean case with a lint-free dry or slightly damp cloth, keep ventilation grille and fans clear of debris.

TROUBLESHOOTING

NO OUTPUT -

Check mains power is on and fuse is OK

Check leads and connections

Check PROTECT LEDs are not lit

Check speakers are working on another amplifier

DISTORTED OUTPUT -

Reduce the input signal level. Ensure that the amplifier output level is within the maximum rating of the connected speakers and gradually increase the input signal, ensuring that the signal is clean and free from distortion.

If protect mode is active, refer to qualified service personnel