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Bavarian Soundwerks' Mobile Electronics Forum
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Old 03-15-2013, 08:54 PM   #1
Tony94
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Low volume after installing an aftermarket radio

Hello everyone, so I have a BMW 2003 325i and I got the radio finally installed today. It is a Sony radio from bestbuy, and I installed it with Metra Amp integration wiring harness. Everything seems fine although the volume is very low, need to turn it up to like 40 plus it seems like the sound is only coming out of the front left speaker. Any suggestions?

Also where should the wiring harness hide, because I wan't able to push in the radio unit completely inside.

A newbie person here, any help is appreciated.
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Old 03-15-2013, 09:15 PM   #2
limpiabota809
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Did you add aftermarket amp?
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Old 03-15-2013, 09:17 PM   #3
Tony94
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Well all I can say is that I have used this wiring harness and connect it to the aftermarket harness thats it


Last edited by Tony94; 03-15-2013 at 09:24 PM.
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Old 03-15-2013, 09:49 PM   #4
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I think that is the wrong harness? I believe you need Metra 70-8590.

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Old 03-15-2013, 09:59 PM   #5
Tony94
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The one above won't work?
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Old 03-15-2013, 10:30 PM   #6
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I just remember seeing a thread some where that stated that the amp needs a high level input, not a low level input that the RCA's provide. From what I've read, the OEM amp (HK or non-HK) requires a 10volt or so input. Most aftermarket decks have a RCA output in the 2-5 range, far below what will work with the factory amp.
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Old 03-15-2013, 10:37 PM   #7
Tony94
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So if I put the other harness all of my speakers will work with decent sound?
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Old 03-15-2013, 11:00 PM   #8
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I can't say with absolute certainty, but I believe the Metra 70-8590 will probably solve your problem. Search that harness model number on this site, and you should find the information you need.
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Old 03-15-2013, 11:09 PM   #9
Tony94
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Thanks for your reply, might try some other solutions first since already bought 2 sets of wires which don't seem to work
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Old 03-15-2013, 11:57 PM   #10
limpiabota809
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The one you use is no good...it doesn't send sound to all the speakers you need the other one posted
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Old 03-16-2013, 10:03 AM   #11
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The OEM head unit outputs are balanced differential. The amp's inputs are probably line level inputs which are unbalanced. You need an LOC converter.
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Old 03-16-2013, 11:31 AM   #12
ccaudio1
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Quote:
Originally Posted by Tony94 View Post
Hello everyone, so I have a BMW 2003 325i and I got the radio finally installed today. It is a Sony radio from bestbuy, and I installed it with Metra Amp integration wiring harness. Everything seems fine although the volume is very low, need to turn it up to like 40 plus it seems like the sound is only coming out of the front left speaker. Any suggestions?

Also where should the wiring harness hide, because I wan't able to push in the radio unit completely inside.

A newbie person here, any help is appreciated.
are all the speakers working? including the sub. i assume you have the HK system since you bought the harness with the rca
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Old 03-16-2013, 11:56 AM   #13
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Quote:
Originally Posted by markusmarkus View Post
The OEM head unit outputs are balanced differential. The amp's inputs are probably line level inputs which are unbalanced. You need an LOC converter.


Incorrect, it is low level input to the OEM amp. The signal is Balanced Differential.

but from what i can remember the output voltage of the OEM radio is higher most of the aftermarket HU. i know alpine, clarion, pioneer has hight output around 4v.
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Old 03-17-2013, 09:28 AM   #14
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Lets meet half-way! "The signals between the OEM head unit and the OEM amp are balanced differential."

Worx for me!
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Old 03-19-2013, 08:25 AM   #15
Tony94
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Well now I got all of the speakers working + the sub by combining the wires together but the volume still low need someway to connect the head unit with amp
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