I have come into possession of a demo unit of a Nakamichi NK6

File: 20170701_120448.jpg (2MB, 3264x2448px) Image search: [Google]

2MB, 3264x2448px

I spotted two connectors that have no associated wires, and I'm thinking one of these are the volume control. As if stands now, the unit defaults to 'very fricking loud', and whines from the soundbar section when powered on.

Im looking to add a volume control to what I have,but understand just enough about electronics to know not to mess with it.

File: 20170701_120856.jpg (2MB, 3264x2448px) Image search: [Google]

2MB, 3264x2448px

At the top of the subwoofer is a digital pot, which rotates continuously (ie, it doesn't have a start/stop position), which would be both the input selector (when pushed in), power button (when pressed and held), and volume (when twisted).

Apologies for the rotated pictures. Top is in all cases to the left.

>>1202403
>>1202403
It's an encoder. The switch is just a switch. The encoder is just switches. You can power it up and short pins to see what happens, then wire accordingly.

>>1202406
Also, some questions.
Did you get the remote control?
It says this unit has Bluetooth, does it have an app?
Did you short the pins until it was loud?

>>1202408
One more question. The black wire shown in your last image, does it go through a hole to somewhere else? Or is that their shitty way of ending a wire that was supposed to be controls?

>>1202408
OP (from computer instead of phone)

The unit came with the subwoofer, soundbar and power cable. As it was a demo unit, it had no remote, and I don't think it has Bluetooth capabilities.

The demo would be powered on all the time, and a customer would press a touch-button to start a 2-minute mp3 played from an external media device. There were touch volume controls on the demo control panel, but these only reduced the input volume, not the volume of the soundbar/woofer combination.

I have done nothing to device except plug it in. The only sound input is a stereo RCA pair (red/white) coming from my computer's sound output (fixed volume). Just an FYI, when I first plugged it in and tried it out, the bar and subwoofer were painfully loud, and had to reduce the PCs output to less than 10% in order for the sound to be comfortable, and it was then that I noticed the whining noise.

The black cable runs to an LED indicator panel in the front of the subwoofer, which would show volume level (0-20) and input selection (which is fixed on 'Aux', rather than the options of Bluetoooth, Optical (no port on the demo) and Aux).

File: labeled board.jpg (2MB, 2448x3264px) Image search: [Google]

2MB, 2448x3264px

I've updated my picture with some more information. Might actually be helpful.