FAQ - SonoFlex Instrument Microphone
Quick Index
- Signal overload when using SonoFlex with Sennheiser AVX — how to fix?
- Can SonoFlex connect directly to a portable speaker via XLR?
- What does the 2 / 3 switch on the base mean?
- How do I choose the correct cable and Switch Mode for different wireless systems?
- Is there a limit to the locking angle of the rotating mount?
- What if I can't find a suitable mounting base for my instrument?
- What should I do if feedback occurs?
When using SonoFlex (2-wire mode) with the Sennheiser AVX system via the CWA03A adapter cable, you may experience:
- Signal overload
- Excessive attenuation required
- Key noise becoming overly prominent
These issues are usually caused by a gain mismatch in the AVX system. Please check and adjust the following:
```Adjust AVX Transmitter Input Sensitivity
- In the AVX transmitter menu, adjust Input Sensitivity / Gain
- Lower the input gain, or enable settings with Attenuation / Pad
- Most users need to set the gain to its lowest level for a proper signal range
Check AVX Receiver Output Level
- Ensure your mixer or speaker is set to receive Line Level
- If connected to a Mic Level input, the signal will be amplified again, causing overload
If the speaker does not provide 48V phantom power, SonoFlex cannot be used.
Popular portable speakers such as the Bose S1 Pro Plus and Roland Cube Street include XLR microphone inputs but most do not supply phantom power — meaning SonoFlex will not be powered and may produce no sound at all.
SonoFlex Requires 48V Phantom Power From:
- Audio interfaces
- Mixers
- Microphone preamps
- Specialized speakers that support phantom power
The 2 / 3 switch selects between 2-wire and 3-wire modes, ensuring compatibility with different wireless transmitters in terms of power supply and signal wiring.
- Ensures the wireless transmitter can properly power SonoFlex
- Maintains stable operation and optimal sound quality
Different wireless systems use different connector types and circuit designs. Use the table below to find the correct cable and Switch Mode for your system:
```| Wireless Bodypack | Connector Type | SonoFlex Cable | Switch Mode | Additional Adaptor |
|---|---|---|---|---|
| Sennheiser / EverSync SP-10 | 3.5mm | CW03A | 2 | Not required |
| DPA | Microdot 2 Pin | CW02 | 2 | Not required |
| Shure | TA4F 4 Pin | CW041A | 3 | Not required |
| Mipro | TA4F 4 Pin | CW041B | 3 | Not required |
| AKG | TA3F 3 Pin | CW03A | 2 | Purchase adaptor → |
| Audio-Technica | Hirose 4 Pin | CW03A | 3 | Purchase adaptor → |
Important Notes
- Incorrect Switch Mode may cause very low or high output, unstable signal, or no audio output
- Adaptor links are listed in the table above — select based on your wireless system
- Need help? Provide your transmitter model number or a photo of the connector and we'll confirm the best cable and settings for you
There is no fixed angle limitation — adjust freely based on your needs.
Align the groove on the base with the cross-shaped mount, then rotate clockwise until you hear a "click" to secure it. The gooseneck can be positioned at 12, 3, 6, or 9 o'clock, making it easy to fine-tune microphone placement for any instrument.
Please contact customer support and provide as much detail as possible:
- Instrument type and model
- Photos showing the shape, tube diameter, or mounting area
We can help evaluate existing compatible solutions, prototype mounts under development, or feasible modification options.
Feedback occurs when the microphone picks up speaker sound → the signal is amplified → re-enters the microphone → repeats, producing a sharp or piercing tone.
How to Reduce Feedback
- Avoid pointing the microphone directly at the speaker — angle it away or position it behind
- Lower the amplifier or speaker volume
- Use a microphone with better directionality (such as a cardioid pattern)
- Use EQ to reduce feedback-prone frequencies (commonly 2 kHz–6 kHz)
- Maintain adequate distance between the microphone and speakers