I have a simple audio setup I am trying to build that consists of an op-amp board (OEP30Wx2), 2 speakers (Dayton Audio ND65-8), a steady 16V power supply (this op-amp requires 16V to drive 8 Ohm speakers at 15W) and a simple aux cable.
First setup was successful, I got clear loud sound coming from my drivers. Then I decided to introduce a 50K potentiometer since I want to build the speaker system into a case with a volume knob (attached to said potentiometer.)
Here is where things got dicey. The sound was definitely not right, things like voices was completely gone and it almost sounds like when an aux cable is broken and one channel was dead. I connected the potentiometer in the following manner:
Here is picture of my actual connections:
The first pair or wires (bottom pair in picture) is a screened audio cable that goes to my aux cable (audio source) that I've stripped the ends of and isolated left, right and ground and soldered it on to the aux cable.
The second pair of wires (top pair in picture) goes from the potentiometer to the op-amp and its connected to INL (left channel input), INR (right channel input) and AGND (audio input ground.) Note that on both wire pairs going to the potentiometer, I took their ground cables to the far left connections (ground connections in the first diagram I showed.)
I'm unsure where I connected the potentiometer incorrectly, and the "Common Ground" connection confuses me - the first cable's ground goes to the potentiometer's bottom connection and the second cable's ground goes to the potentiometer's top connection. Is that right?