Just finishing up a little project I have been working on: taking 2 ubiquitous Logitech X-230 2.1 computer speakers and making a 2.2 system with them.
In doing this I found that a lot of information on the web about these systems is missing or incorrect, including the pinout. So here is how it really works:
DB-9 pinout, cable side:
pin 1 = short to pin 7
pin 2 = purple = R in
pin 3 = yellow = R spkr +
pin 4 = red = L spkr +
pin 5 = green & shield = GND in
pin 6 = grey = sense
pin 7 = short to pin 1
pin 8 = (black = R spkr -) & (blue = L spkr -)
pin 9 = brown = L in
TRS pinout (I know this is flipped, trust me):
Tip = red = L
Ring = white = R
Sleeve = shield = GND
Operation:
plugging in the DB-9 with shorted pins 1 & 7 turns on the master power
satellite power switch off = grey shorted to black
satellite power switch on = LED + 1.9K in series between grey and black
Y cable to make a 2.2
purple -> R
yellow -> R
red -> L
green -> L+R
grey -> L+R
black -> R
blue -> L
brown -> L
In doing this I found that a lot of information on the web about these systems is missing or incorrect, including the pinout. So here is how it really works:
DB-9 pinout, cable side:
pin 1 = short to pin 7
pin 2 = purple = R in
pin 3 = yellow = R spkr +
pin 4 = red = L spkr +
pin 5 = green & shield = GND in
pin 6 = grey = sense
pin 7 = short to pin 1
pin 8 = (black = R spkr -) & (blue = L spkr -)
pin 9 = brown = L in
TRS pinout (I know this is flipped, trust me):
Tip = red = L
Ring = white = R
Sleeve = shield = GND
Operation:
plugging in the DB-9 with shorted pins 1 & 7 turns on the master power
satellite power switch off = grey shorted to black
satellite power switch on = LED + 1.9K in series between grey and black
Y cable to make a 2.2
purple -> R
yellow -> R
red -> L
green -> L+R
grey -> L+R
black -> R
blue -> L
brown -> L
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