Connecting Speaker Level Outputs to
Harman Amplifiers
Line Level Output
Signal (signal +)
0v (signal -)
 Signal (+) is carried on
the center conductor
of the RCA plug
 Ground (reference) is
carried on the RCA
shield. This ground is
the same as chassis
ground on the output
of the radio.
 The typical maximum
output voltage of the
radio’s line level
output is <2.8V RMS
1
Speaker Level Output
 Signal (+) is carried on the +
speaker wire
12V
Signal (signal +)
 Signal (-) is carried on the –
speaker wire
 There is no signal connection to
ground
 Both speaker wires will show
+6V DC to chassis ground.
6v
 Some low-level signals from OE
systems (input to the OE
amplifier) may be configured
this way.
 Speaker level outputs have a
maximum voltage of 8.4V
0V
Signal (signal -)
 Speaker level outputs are about
10dB “hotter” than the best linelevel outputs. (2x voltage = 6dB)
2
Connecting Speaker Level Output to MS
and GTO-EZ Amplifiers
 Attach the included RCA-tobare-wire adapters to the
speaker output leads from the
radio.
 Be sure to connect them in
correct polarity.
 Plug the adapters into the
amplifier.
 Follow the instructions in the
owner’s manual for input
sensitivity setting with the
included setup CD.
3
Connecting Speaker Level Output to
Reference, Kappa, GTO and GT amplifiers
4
Connecting Speaker Level Output to
Reference, Kappa, GTO and GT amplifiers
Use only insulated RCA ends! 6V DC will be
present on the shield connector!
Do not allow shield to touch chassis
ground!
Speaker Level
Output
Front Left +
Front Left Front Right +
Front Right -
Repeat for Rear Speaker Level Outputs
5
Making the Adapters
 Get an old or cheap RCA cable
 Cut off one end
 Strip away the outer insulation
to reveal the two conductors
inside
 Strip away the insulation from
the two conductors
 Use your ohm meter to test
continuity between the
conductors and the ends of the
RCA plug
 Solder the inner conductors to
the speaker outputs of the radio
and use shrink tube to insulate
6