Qtx QA400 Operation & User’s Manual

QA400/QA100 QA SERIES POWER AMPLIFIER Item ref: 172.020UK/172.025UK User Manual  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 Specification: QA400 QA1000 Output Max per channel @ 4Ω 200W 500W Output RMS per channel @ 4Ω 100W 250W Output Max per channel @ 8Ω 140W 340W Output RMS per channel @ 8Ω 70W 170W Dimensions 88 x 482 x 270mm 88 x 482 x 340mm Weight (unpacked) 6.8kg 9.1kg 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: Operation:  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 Troubleshoot: 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 This 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. Errors and omissions excepted. Copyright© 2015. AVSL Group Ltd.