[Dwtk]

hi guys

I have had zenec oem style stereo ( Bmw plug and play connections ) in my car with basic audio system in my 2008 e93 ( 2 front door , 2 rear , 2 underfloor subs ) . The stereo has a canbus to relay Bmw controls like steering heater controls , and parking sensors sounds . But this weekend I upgraded to alpine hifi kit and I'm getting no sound When the amp is on ( which is powered on ) and wires are spliced as per instructions . When I return wiring back to original basic Audio . The new speakers work fine but obviously the amp is not doing anything . Can anyone point me in the right direction how to fix this .

Much appreciated . Took me 2 days to fit the new amp speakers and wires . Don't fancy pulling car apart again .

Ish

[essex_lad]

I think the alpine amp uses an optical input doesn't it? Or is that logic 7 amp.

[Sbm007]

Originally Posted by essex_lad

I think the alpine amp uses an optical input doesn't it? Or is that logic 7 amp.

Nope the Alpine amp isn't optical, you're thinking of the top HiFi system (option 677), and to be fair if you've got that you'd never think about upgrading your sound

OP: It might be worth disconnecting all speakers and connecting them one by one and see if it works, and then isolate the culprit. It could well be a faulty amp! Also not sure what retrofit kit you've got, the newer one has a plug and play harness, but the older one requires you to splice and connect wires yourself, it could be possible the wiring to the amp is wrong?

[Dwtk]

I was going out of my mind trying to fix this . In the end i had the cables mixed up for sub and radio from amp, trying to trace cables to destination is too hard. The best way I found and the easiest way to find out which is which is put them back to the original state ( All the + together, all the - Together ) then take out a wire at a time and through the process of illimination work out which were the subs and which ones are radio. I would recommend labelling them when you work out which is which . The ones going front are pretty obvious are door speakers but still needed to determine between sub and radio cable. I have a new issue now . I believe with the upgrade the radio wire carries all the speaker frequencies . The amp then takes this input and outputs to front doors and sub . I am yet to work out if any freq filtering is done on out puts to door speaker and sub . Any ideas ? The issue im having is the sound isnt balanced . The door mids are out putting too much base .

[david in germany]

what door speakers are you running? I am using a set of stock Logic 7 speakers on my alpine upgraded amp and they do not have any external filtering other than the inline cap in the tweeter but still get loud and stay extreamly clean.

[Sbm007]

Originally Posted by Dwtk

I was going out of my mind trying to fix this . In the end i had the cables mixed up for sub and radio from amp, trying to trace cables to destination is too hard. The best way I found and the easiest way to find out which is which is put them back to the original state ( All the + together, all the - Together ) then take out a wire at a time and through the process of illimination work out which were the subs and which ones are radio. I would recommend labelling them when you work out which is which . The ones going front are pretty obvious are door speakers but still needed to determine between sub and radio cable. I have a new issue now . I believe with the upgrade the radio wire carries all the speaker frequencies . The amp then takes this input and outputs to front doors and sub . I am yet to work out if any freq filtering is done on out puts to door speaker and sub . Any ideas ? The issue im having is the sound isnt balanced . The door mids are out putting too much base .

You need to flatten the signal from the HU to the amp. By default it will be equalised if you have the base system. You need have your car coded from Stereo to HiFi and that will send a raw signal (Google it plenty of documentation on this). The equalised signal has the higher frequencies boosted to compensate for the lack of tweeters in the base system.

After doing that and you're still not happy, you could try playing with the switch on the bottom of the amp. I have mines set to position 2. I don't know exactly know what the switch does but I heard it effectively increases/decreases power to the subs. But might be wrong on that.

[Dwtk]

I have aftermarket head unit .

http://www.e90post.com/forums/showthread.php?p=18321030

so the signal should be flat. Is there any filtering / crossover done on the amp base out ( green cables from the amp ) .

The switch on the bottom is switch between proffessional business / to professional navigation ( eg non idrive and idrive ) . I think .

I wanted to decouple base from the other speakers so I have decided to get another amp and use the sub pre out of the Zenec to control the subwoofer via the equaliser