Audio Choice Qm4 Manual Link -

Manual Section Reference: Chapter 3 - Configuration The QM4 requires the Q-SYS Designer software to function. The manual link often directs users to the software download page first.

Because Audio Choice amplifiers are often considered "vintage" or "discontinued boutique" gear, several classic car audio archives hold the file.

The Audio Choice QM4 is frequently sold and supported through Studio Technologies. The official manual is typically hosted on their website. audio choice qm4 manual link

Manual Section Reference: Chapter 2 - Hardware Interface The QM4 is designed to bridge the gap between legacy analog equipment and modern networked audio. When consulting the manual, pay close attention to the GPIO (General Purpose Input/Output) diagrams. Manual Section Reference: Chapter 3 - Configuration The

Given that Audio Choice is no longer an active brand, the original PDF may disappear from hosting sites. Here is your backup plan:

Manual Solution: The QM4’s bass boost is centered at 45Hz with a Q factor of 2. If you set the boost above 6dB, the amplifier will clip even at low gain. The manual recommends using the LPF crossover at 80Hz before adding any bass boost. Alternative Source: If the link above is broken,

Once you click your preferred Audio Choice QM4 manual link, follow these steps to ensure you never lose it: