Follow the gain setting method mentioned in section 2A to find the perfect input level. 4. The Benefits of Manual Control
: Use the individual tone controls to cut the specific frequencies that are "ringing." Moving the microphone behind the speakers also significantly reduces feedback loops.
If you want to fine-tune your specific live setup, let me know: audio choice qm4 manual better
Example: A common forum post suggests using a Y-splitter to connect two microphones to Input 1. The manual explicitly warns against this (page 8), noting it will drop impedance below 600 ohms and cause thin, distorted audio. Following the manual is demonstrably .
The original Audio Choice QM4 manual has a tiny FAQ section. Here is the expanded, better version. Follow the gain setting method mentioned in section
Set the QM4 gain to minimum, turn your head unit to 80-90% volume, and slowly raise the gain until you hear distortion, then back it off slightly.
Tame the Mid or High slider to smooth out vocals. 3. Controlling the Built-In Spring Reverb If you want to fine-tune your specific live
Most users set the channel volume to maximum and then lower the master volume. This is incorrect. The manual explains the "unity gain" method:
: The manual is absolutely necessary here to prevent you from blowing up the internal amplifier. It will state the minimum OHM load (usually 4 or 8 ohms) allowed when connecting speakers in parallel. EQ and Effects Routing
| Problem | What the Manual Says | What Actually Works (Better) | | :--- | :--- | :--- | | | Check speaker wires. | Check if Zone 2 is muted via the RS-232 control. The front panel won't show this. Cycle power. | | Remote control works intermittently | Replace batteries. | The IR sensor is behind the LCD glass. Clean the glass with microfiber. Also, fluorescent lights interfere—move the unit. | | One channel is louder than the other | Balance settings. | The QM4 has a digital balance that drifts. Go to Menu > Zone Config > Balance. Set to "0" even if it shows "0"—re-select it. | | Unit shuts off at high volume | Reduce volume. | Your speaker impedance is too low. You need 8-ohm speakers. If using 4-ohm, only use two zones max. The manual omits this thermal calculation. | | Hum on Input C only | Check cable shielding. | Input C shares a ground plane with Input D. Use a ground loop isolator or cut the shield on one end of the RCA cable. |