I’m attempting to install an aftermarket head-unit in my son’s 93 400e. The car has 6 speakers, 2 in the front window, 2 in the front doors and 2 in the rear. It seems the more I research this issue the more confused I get. From what I can gather, the front/rear speakers are 4ohm and the doors are 2ohm subwoofers.

The aftermarket radio is 4 channels (52x4 with two mono outputs for subwoofers.) Head unit has 4 RCA jack outputs and two mono subwoofer outputs – in addition to the standard color coated wires for speakers (52x4 channel).

Which scenario would you choose?

(1) Just run a couple of wires from the aftermarket head unit to the MB amp in the trunk. I could use only two of RCA Front/Rear Preamp Outputs with hi-pass filter head unit to the MB amp in the trunk. Or just use two radio’s channels/speaker wire connections 52x2 to run to the MB amp in the trunk. (I’m wondering it I would need a line/power adjuster before the amp.) And continue to use the existing front/rear fader control in the console.

(2) Run the front and rear window speaker with the 52X4 channel wires and use the mono plug on the head unit plug to run to MB amp which will power the MB door subwoofers (2 ohms) speakers. (I don’t know how this option would affect the front/rear fader control on the MB console.)

(3) Run the front and rear window speaker with the 52X4 channel wires and use the mono plug on the head unit plug to run to an after market mono amp to power the MB door subwoofers (2 ohms) speakers. This scenario would totally bypass the front rear fader.

Geeze… MB doesn’t make it easy for this year model.

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Russell McMahon
Tulsa, OK
2001 CLK 320
1992 400se
1993 400e
2000 320ML