Harmon Kardon system upgrade amp

Gecko123 · Yesterday, 01:50 PM

Anyone here have the factory Harmon Kardon audio and upgraded the amp to something like the MatchUp

MATCH UP 8BMW 8-CHANNEL DSP AMPLIFIER PLUG N PLAY, BMW HIFI SOUND OPTION 676

Thoughts or suggestions to upgrading the amp

ctuna · Yesterday, 04:32 PM

base system wiring pre/post 3/09
https://www.google.com/url?sa=t&rct=...tDpLJPcGkw_ui_
Base System Guide
http://www.e90post.com/forums/attach...5&d=1493273253

If you have the Logic 7 aka HK system(option 677 or 688) it is pain to change it because of the Fiber optic Connection between the Head Unit and Amp .
The Most Bus system (Fiberoptic system) is not compatible with aftermarket Amps. Also you are dealing with 9 speaker locations and 9 channels . BMW calls there system 13 or 11 speakers because they count tweeters as speakers. But there are 9 channels.

To overcome the Fiberoptic output of the Head Unit you can reprogram it to Hi Fi which has a standard analog head unit output that is a plus minus 5 volt signal. Then add lines to your aftermarket amp for the Analog Inputs.

The Match up BMW system is designed for Hi Fi replacement they even have harnesses that plug into that system .
But you have to know you have 676 and not the HK 677 or 688 system mentioned above.

IN the case of the 676 sytem the Match system is way above that when coupled with good speakers. Also better than the HK 677 or 688 system when matched .

There are also several other Match system now on the Audio Tech Fisher Site designed to work with the 676 system with more or better output and better DSP.

Technicpnp.com has a harness for the 677 or 688 system if you wish to rip it out and reprogram the Head Unit to output Analog signals.

Gecko123 · Yesterday, 10:39 PM

Ok. Thank you very much. Appreciate your thorough explanation. Thanks again!!

Yesterday, 01:50 PM	#1
Gecko123 Private 39 Rep 93 Posts Drives: 2011 BMW 328xi Join Date: Feb 2016 Location: Canada iTrader: (0)	Harmon Kardon system upgrade amp Anyone here have the factory Harmon Kardon audio and upgraded the amp to something like the MatchUp MATCH UP 8BMW 8-CHANNEL DSP AMPLIFIER PLUG N PLAY, BMW HIFI SOUND OPTION 676 Thoughts or suggestions to upgrading the amp
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Yesterday, 04:32 PM	#2
ctuna Lieutenant General 2438 Rep 14,068 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	There is a stereo sub forum here where a lot of the following links came from . Be sure you know if you have 676 Hi Fi system = easy to upgrade 6 channel system or a 677 or 688 Hk system hard to upgrade because of the Fiberoptic Interface between the Head Unit and Amp and the number of speakers and channels. BMW stereo types http://www.e90post.com/forums/showthread.php?t=352586 http://www.e90post.com/forums/attach...2&d=1266451970 http://www.e90post.com/forums/attach...2&d=1260829447 http://www.e90post.com/forums/attach...1&d=1209780865 http://bmwcoders.com/forum/3-er-8/bm...1-e92-e93-291/ http://technicpnp.com/menuDiagrams/d...e90_92_93.html http://www.musicarnw.com/page-2/ http://www.e90post.com/forums/attach...3&d=1169133185 http://www.e90post.com/forums/attach...1&d=1209780605 http://www.e90post.com/forums/showthread.php?t=641323 http://www.e90post.com/forums/attach...4&d=1278871872 http://www.e90post.com/forums/showthread.php?t=343673 https://www.bimmerfest.com/threads/e...n-752.1275694/ base system wiring pre/post 3/09 https://www.google.com/url?sa=t&rct=...tDpLJPcGkw_ui_ Base System Guide http://www.e90post.com/forums/attach...5&d=1493273253 If you have the Logic 7 aka HK system(option 677 or 688) it is pain to change it because of the Fiber optic Connection between the Head Unit and Amp . The Most Bus system (Fiberoptic system) is not compatible with aftermarket Amps. Also you are dealing with 9 speaker locations and 9 channels . BMW calls there system 13 or 11 speakers because they count tweeters as speakers. But there are 9 channels. To overcome the Fiberoptic output of the Head Unit you can reprogram it to Hi Fi which has a standard analog head unit output that is a plus minus 5 volt signal. Then add lines to your aftermarket amp for the Analog Inputs. The Match up BMW system is designed for Hi Fi replacement they even have harnesses that plug into that system . But you have to know you have 676 and not the HK 677 or 688 system mentioned above. IN the case of the 676 sytem the Match system is way above that when coupled with good speakers. Also better than the HK 677 or 688 system when matched . There are also several other Match system now on the Audio Tech Fisher Site designed to work with the 676 system with more or better output and better DSP. Technicpnp.com has a harness for the 677 or 688 system if you wish to rip it out and reprogram the Head Unit to output Analog signals. Last edited by ctuna; Yesterday at 04:50 PM..
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Yesterday, 10:39 PM	#3
Gecko123 Private 39 Rep 93 Posts Drives: 2011 BMW 328xi Join Date: Feb 2016 Location: Canada iTrader: (0)	Ok. Thank you very much. Appreciate your thorough explanation. Thanks again!!
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