Press the button to cycle through:
: Controls the input level of the specific channel.
The Audio Choice QM4 is a high-quality audio amplifier designed for home and professional use. This guide will walk you through the manual to help you get started with your QM4.
Approximately 9.5 to 20.5 lbs depending on the specific model variation/enclosure. Operational Controls Per-Channel Controls: Gain: Sets the input sensitivity for the specific channel. Tone: Basic equalization for individual sound sources. audio choice qm4 manual
| Problem | Possible solution | |---------|------------------| | Cannot power on | Charge battery for at least 30 minutes; try a different USB cable. | | No sound / distorted audio | Check volume level; ensure Bluetooth device is not muted; move device closer. | | Bluetooth not pairing | Turn QM4 off/on; delete old “QM4” from phone’s Bluetooth list; re-pair. | | microSD/USB not recognized | Format card as FAT32; limit file depth (no subfolders over 2 levels). | | FM radio poor reception | Extend any attached USB/AUX cable as an antenna; move near a window. |
Switch the QM4 power rocker to the position. The power LED indicator will illuminate. System Settings Quick Reference Use these optimal baselines to dial in your mix safely. Component Parameter Recommended Baseline Operational Function Channel Volumes 12 o'clock (midway) Balances relative levels between performers. Master Volume Start at 0, dial up gradually Sets overall venue sound pressure level. Master Graphic EQ Flat center position (0 dB) Standard room baseline before corrective tweaks. Source Gain Signals Below audible distortion Maximizes headroom without clipping. Operational Best Practices and Gain Staging
Set all channel Reverb and Tone controls to their center points. Turn the Master Volume knob to roughly 40-50%. Speak or play into your input source while gradually turning up that specific channel's Gain knob until the volume matches your environment. Repeat this step across all active channels to achieve a balanced audio mix. Advanced Operations: EQ, Effects, and Routing Press the button to cycle through: : Controls
: A standard LED displaying active system power status. Step-by-Step Initial Setup Guide
: Allows you to patch external hardware like graphic equalizers or delay pedals. Run a cable from EFX Send to the input of your pedal, and route the pedal's output back into EFX Return .
Place the QM4 powered head on a stable, level surface away from moisture. Mount your passive speakers on stands for optimal acoustic coverage. Approximately 9
The Audio Choice QM4 is a versatile and high-performance audio amplifier. By following this guide, you'll be able to understand its features and operations, ensuring a great listening experience.
| Parameter | Value | |-----------|-------| | Output power | 5W – 10W (depending on version) | | Frequency response | 80Hz – 18kHz | | Battery capacity | 1200mAh – 2000mAh Li-ion | | Playtime (mid volume) | 4 – 8 hours | | Charging time | 2 – 3 hours | | Bluetooth version | 5.0 (or 4.2) | | Supported formats | MP3, WAV, WMA | | Dimensions | Approx. 180 x 70 x 70 mm | | Weight | Approx. 350g |
Use the Master Graphic EQ to identify and slightly drop the offending frequency slider causing the ring. Troubleshooting the QM4 Issue 1: The unit will not power on