Okay, I have 2 amplifiers in my truck. One powers the subwoofer and 4 door speakers. The second powers 2 tactile transducers, 1 mounted to each of the front seats. I have remote volume control of the subwoofer because that feature is built into the amplifier itself (Alpine PDX V9) but I would like to control the "volume" of the tactile transducers.
The head unit has 3 pairs of RCA output: front, rear, and sub. They are all connected to the PDX. The amplifier for the seats has high level inputs and I am using what would normally power the door speakers from the head unit to get signal to that amp. In theory I could buy a high level to RCA converter and then use that to get signal to the amp and either buy one with volume control functionality built in (expensive and would control both with 1 knob) or hack the RCAs to put potentiometers in line. I do not want to do either or those options.
Ideally I would like to put something like potentiometers inline between the headunit and the amplifier to control the volume to each of them individually and keep the wiring to the controls as far forward as possible. I have enough wires running front to back in there already. Is this possible, and if so what should I use?
Thanks in advance.