at the Front Right Speaker

The 15 Pin connector from the Subwoofer to the Front Right Speaker. All other speakers are connected by a phono lead except front right which uses has the following layout.

The Front right speaker controls the inputs and outputs of the system. There are 3 inputs to this speaker to make the whole system work:

Green: Front Speakers
Black: Rear Speakers
Orange:Subwoofer and Center

These are the sound inputs and they pass through a small circuit in the Front Right speaker when they then go to the Subwoofer to be amplified and distributed.

The Front Right Speaker also controls the output, by means of the potentiometer, switch and headphone sockets, the functions of the circuit are at the bottom and the pinout for the 15pin HD D-connector is below. The numbers are different from common 15pin HD D-connectors but they follow the pinout diagram.

Pin Number	Lead Color	Lead Color (alternate models)	Pin Name	Description (may be empty)
1	Brown	Brown	Green Left
2	Purple	Purple	Green Right
3	Grey	Grey	Orange Left	(Center)*
4	Orange	Brown/Black	Black Left
5	Red	Purple/Black	Black Right
6	Black	Grey/Black	Orange Right	(Subwoofer)*
7	-	-	-	Not Used
8	Dark Blue	Blue	Headphone Circuit	See Below
9	Copper	Copper	Shielding
10	Green	Green	GND	Ground
11	Yellow	Yellow	Switch + LED Circuit	See Below
12	Light Blue	Red/Black	Headphone Circuit	See Below
13	Red (thick cable)	Red (thick cable)	Speaker IN -ve
14	Black (thick cable)	Black (thick cable)	Speaker IN +ve
15	White	White	Switch Circuit	See Below

*I think this is correct however I may be wrong,
Switch Layout

The Switch is a DPDT switch:

TO LED

ON

O	O	PIN 11
6V	O	IN	O	PIN 15
Unused	O	OFF	O	Unused

Potentiometer Layout

The Potentiometer has 6 Input and Outputs for each channel, providing between 10K and 0K resistance.

Each pin has this Layout:
+ OUT -
O-----O-----O
\/
|-[ 10K ]-|

O

O	O	Orange Right (Sub)*
O	O	O	Black Right
O	O	O	Black Left
O	O	Orange Left (Center)*
O	O	O	Green Right
O	O	O	Green Left

Headphone Circuit

The headphone socket contains two pins that break the circuit if anything is plugged in.
This determines whether or not to allow the speakers and amplifier to work in the Subwoofer.
This is the circuit:

Pin 8 Switch Headphone Socket Pin 12
O-----------O/ O---------------O _|_ O-----------O

If there is not a direct connection between 8 and 12 sound will only come out of the headphone socket.

LED Circuit

6V comes out of the switch and into the power LED, this then has a few resistors but ends up at pin 11. Im guessing pin 11 is some sort of Ground or leads onto another circuit inside the Subwoofer, therefore can't really so much with pin 11.

Switch Circuit

There is 6V coming into the speaker and this passes through the main DPDT Switch. When the switch is closed the 6V isn't taken anywhere significant or obvious as far as I could tell. But when it is on it goes to the Power LED and then on to more things that I haven't looked at. The other side of the DPDT links pin 15 and 11 together which must form another circuit inside the Subwoofer activating the amplifier and speakers.

Therefore as with the headphone socket there needs to be a direct connection between pin 15 and 11 to make the speaker work.

*I think this is correct however I may be wrong,

Just using the sub

I did some tinkering with this speaker system, my intention was to just use the sub woofer part because my monitors for my M-box lacking in bass response.

This works fine for me, I also made a 2 1/4 mono inputs to combined mono RCA for this project, so I have a summed input for the sub.