Place the QM4 powered head on a stable, level surface away from moisture. Mount your passive speakers on stands for optimal acoustic coverage.
: To send the signal to another amplifier or recording device. Footswitch Jack : Allows hands-free toggling of the internal reverb. Operational Guide
Controls the overall volume of the 100-watt built-in amplifier. audio choice qm4 manual
: If connecting one passive speaker, ensure it has an impedance rating of 4 ohms or 8 ohms .
Because the SoundTech QM4 relies on analog potentiometers and mechanical switches, regular maintenance keeps the system humming without distortion. QM4 AND QS4 Instruction Manual - TDK Product Center Place the QM4 powered head on a stable,
) is a 100-watt, 4-channel powered PA mixer head typically sold as part of the C100 portable system. While a formal digital manual is rare, the device's straightforward analog design allows for easy operation based on its physical controls. Musician's Friend Core Specifications Power Output : 100 Watts RMS at 4 Ohms. : 4 independent input channels. Dimensions : approximately 18.5" W x 11.5" D x 6" H.
| Status | LED Behavior | |--------|---------------| | Charging | Red solid | | Fully charged | LED off / Blue solid (if on) | | Bluetooth pairing mode | Blue flashing quickly | | Bluetooth connected | Blue solid (or slow pulse) | | Low battery | Red flashing every few seconds | | AUX / microSD / USB mode | Blue solid or slow blink (varies) | | FM radio | Blue slow blink | Footswitch Jack : Allows hands-free toggling of the
When connected via Bluetooth:
: Includes a 3-band EQ, master reverb control, and a master level slider.
To ensure the longevity of the analog circuitry and prevent blown speaker voice coils, always perform your hardware connections in this sequential order: