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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > AUDIO/VIDEO + BLUETOOTH + Electronics/Alarm/Software > Amp Wiring Query



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      02-07-2011, 03:42 PM   #1
andy c
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Amp Wiring Query

Hi everyone,

So this week i have ordered a new amp, going to upgrade my front and rear speakers.

I decieded to buy the Alpine PDX F4 amplifier, a good spec amp.

After fitting the alpine retrofit kit, i was wondering if i could splice from the rear speakers to get my input for this amp aswel.

Please view the attached pic for the input connections, im not to clued up on car audio, could this be done, possibly with a adapter?

If not what am i going to need/do to make this work.

Thanks all,
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      02-07-2011, 06:48 PM   #2
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It doesnt look like you have hard inputs. Youll need a line adapter to take the output from the deck (input to rear speaker) to convert that signal to an RCA line to input to your amp.
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      02-07-2011, 08:20 PM   #3
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Do you have Base or HiFi audio in the car from factory? Do you have (3) sets of speakers (including the underseat subs)? Because if you do, you should be using a (6) Channel Amp

Obviously, you don't have the Logic7 system cause that amp would never work with that.

Personally, I purchased the JL Audio XD600/6 to replace my factory HiFi amp based on recommendation from 'Technic'

The JL amp is configured to accept the funky BMW HU output, has 6 channels for:
  • CH1/CH2 -> Front Door Components (Mid + Tweeter)
  • CH3/Ch4 -> Sail Panel Components (Mid + Tweeter)
  • CH5/CH6 -> Underseat (Subs)

Note: this is setup for HiFi speaker configuration in my E92. If you have E90 or base system yours may be different.


Amp can power 4ohm loads @ 75W or 2ohm loads (Factory speaker rating) 100W for each channel. All channels have Hi or Low Pass Filtering with different Hz cutoffs, and Adjustable Gain Control.

Technic even sells a premade wiring harness including 4AWG Power/Gnd hookups that plugs right into your factory amp connector and then in to your new amp without cuttting any factory wires.

He also sells premade speaker connector pigtails so that you can solder them on to your new aftermarket speakers then simply plug right into factory speaker connectors without cutting.

That way, everything you do is reversible with no damage to factory wiring or resulting 'spaghetti warehouse'


>> When in doubt, your best bet is to contact the forum audio guru's 'Technic' or 'VP Electricity' one, or both of them should be able to get you straight away...
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      02-08-2011, 05:31 AM   #4
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Thanks for the replys,

Tzu - Do you know where to purchase these adapters from?

1quikws6 - Unfortunatly ive already bought this amp, Although if i would of known this i would have probaly down the route you have suggested.

I have the basic stereo, 6 speakers...
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      02-08-2011, 05:46 AM   #5
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I have done a search on google, and i have found these examples.

Is this what i am looking for? or is something else.


http://cgi.ebay.co.uk/Car-Audio-Boos...93f4e3fece5565

http://cgi.ebay.co.uk/High-to-Low-Le...35112538641950

http://cgi.ebay.co.uk/RCA-Car-Line-2...82934851550807
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      02-08-2011, 06:25 AM   #6
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Personally, I like these - you can bet the quality is good:

JL Audio wire to RCA cables = $26 (pair)

http://www.shopatron.com/products/pr...r=91803/1451.0
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      02-08-2011, 06:48 AM   #7
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Yea unfortunatly i cannot find a supplier here in the UK for the JL converters, ive searched through google and ebay.

I see i have two white plugs and two red plugs on the amp, Am i going to need two adapters then? does it work out in one for each side of the car?

Oh and i would just like to add, the instructions for this amp are terrible.. Not very informative for someone with not alot of experience in car audio.
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