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Old 06-23-2002, 11:48 PM   #1
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Join Date: Jan 1970
Location: SoCal
Posts: 487
My Ride: E92 335i
Installing an amp & high-to-low level convertor

One more for the archives

I added an RF 250M amp and JL Audio 12w3 to my HK stereo (This should be applicable to non-HK as well). Nothing worth showing off at a car show but it clean and gets the job done. Here's how I did it.

Power wire = Straight to battery make sure and include a fuse.
Ground Wire = Screw into metal on body. Sand down to bare metal first.
Remote Turn-On = White wire going to amp on right side of car.

High to Low Level converter:
Left + = Solid Yellow from amp
Left - = Solid Brown from amp
Right + = Solid Blue from amp
Right - = Solid Brown from amp

The wires I tapped into are for the woofers in the rear deck.

Run RCA's from converter to amp.

After some experimentation: I discovered the bass sounds best facing the sub towards the trunk, close as possible to the backseat.

The bass really helps out the HK stereo and makes the stereo good enough for me (for now).

Note: In my sedan (non-HK) I didn't use a converter I just soldered on some RCA plugs. I know it's possible but couldn't remeber which wires to use so I just used the converter this time.

Here's a pic of where I mounted my remote bass control: (It's not crooked in real life)
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Old 06-24-2002, 12:15 AM   #2
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Join Date: Jan 1970
Location: Saint Louis, Missouri
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My Ride: 2011 335is
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Here's a diagram of what I did...

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Old 06-24-2002, 12:39 AM   #3
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Location: SoCal
Posts: 487
My Ride: E92 335i
Yeah I tried to use that method first, but I removed the HK additional subs and amp to mount my amp there and for the life of me I couldn't figure out which wires to tap into from the harness. (Plus I had about 6 beers in me and my brain wasn't working real well. That's when you know you're a true modder when you have a house full of people including a couple hot girls and your in the garage working on the car. LOL)

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