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2002 bmw z3 harmon kardon upgrade?

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jlsmobilesound 
Member - Posts: 8
Member spacespace
Joined: March 13, 2007
Location: United States
Posted: March 13, 2007 at 4:54 PM / IP Logged  
Been trying to find the wiring schematics for this 2002 BMW Z3 Harmon Kardon System - nice car but the system just sounds like cr*p! Customer is over it, especially with spring break and summer coming they want it louder. Tried running a new car stereo Sony receiver but it still sounds bad. Found out it has a Harmon Kardon Amp in the trunk that is supposedly an 8ch/10ch amp? Anybody ever upgraded one of these? Wiring info would be great! Thanks!
Velocity Motors 
Moderator - Posts: 12,488
Moderator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Fabrication. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spaceThis member has been recognized as an authority in Mobile Security and Convenience. Click here for more info.spacespace
Joined: March 08, 2002
Location: Manitoba, Canada
Posted: March 14, 2007 at 8:16 AM / IP Logged  
You will need to rewire the system. I have a Z3 M with the so called " upgraded system " and it was crap as well. Re-wired all the speakers to a 4 channel amp and then added sub and remo0ved all OEM speakers from the vehicle. As well, make sure that you deaden the cover for the rear center speaker cover if your going to keep it in the vehicle because it will rattle and buzz..... drives you crazy !
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
jlsmobilesound 
Member - Posts: 8
Member spacespace
Joined: March 13, 2007
Location: United States
Posted: March 16, 2007 at 12:08 AM / IP Logged  

Actually,

They had work done previous at another place which installed a Sony deck and "customized" a center replacement "subwoofer" there. Sounds "okay" - and I'm being nice, BUT could be better and they wired the Sony to the stock speakers! Such mediocrity work and within a few weeks the stereo started cutting out because it was overload with the ohm load going into the stereo. We had to do what you just said - disable the HK amp and take out HK speakers! BIG difference - just fixing the alternator/ground noise now. What do you have in your Z3 now?

Velocity Motors 
Moderator - Posts: 12,488
Moderator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Fabrication. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spaceThis member has been recognized as an authority in Mobile Security and Convenience. Click here for more info.spacespace
Joined: March 08, 2002
Location: Manitoba, Canada
Posted: March 16, 2007 at 9:56 AM / IP Logged  
I have a 1998 Z3 M Roadster. Replaced the speakers and added 4 channel amplifier. This year will be working on a new rear center enclosure for the 10" subwoofer and add a monoblock amp to it as well. Will also be fiberglassing the front dash for an indash screen & iPod docking station.
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

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