I got this Fosi 2.1 amp because of the controls it has, and the power output specs are likely good for the cost, even if it only outputs 25% of the advertised specs RMS. https://www.parts-express.com/Fosi-...mplifier-165W-x-2-350W-x-1-235-258?quantity=1
Unlike a similar $30-40 2.1 caseless amp that has independent volume controls for treble and subwoofer, and no bass adjust for the treble, but it does have a master volume knob, the Fosi has the treble bass, but no treble volume. The problem is that I can't turn down the treble independently of the sub without turning the sub down.
Any ideas about how to safely go about finding out how to send signal past the master volume to the sub volume knob? Maybe probing around with a resistor? Any idea of where to start other than likely between the master and sub volume?
Left to right: Sub Freq, Sub Vol, Treble, Bass, Master Volume.
I'm not sure what this little switch is for, it was up against a little patch of clean aluminum on the otherwise entirely black front plate. Maybe an anti tamper self destruct switch?
Unlike a similar $30-40 2.1 caseless amp that has independent volume controls for treble and subwoofer, and no bass adjust for the treble, but it does have a master volume knob, the Fosi has the treble bass, but no treble volume. The problem is that I can't turn down the treble independently of the sub without turning the sub down.
Any ideas about how to safely go about finding out how to send signal past the master volume to the sub volume knob? Maybe probing around with a resistor? Any idea of where to start other than likely between the master and sub volume?
Left to right: Sub Freq, Sub Vol, Treble, Bass, Master Volume.
I'm not sure what this little switch is for, it was up against a little patch of clean aluminum on the otherwise entirely black front plate. Maybe an anti tamper self destruct switch?