Jump to content

Server Lease Renewal/Software Licenses

Our yearly server lease, software licenses, as well as hardware operating costs, WERE due Dec 4th, 2022. Our current donations have fallen far short of the funds we need to renew. Please remember the RennTech.org community is Member supported so please consider a donation to help...  THANK YOU!

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

Upgarding Bose Audio / MOST

Recommended Posts

I'd like to upgrade the sound in my '04 C4S. At the same time, I'd like to keep the PCM nav system and the integrated audio control. It looks pretty clear that I can replace the speakers w/o any problem, since they are hooked to the amp woth the usual copper speaker wire. In looking around, I can't tell if the MOST bus will allow me to keep the CD/Radio/CD changer and upgrade the amp. It looks like the fiber optic connections also go to/from the amp. If I replace the amp, will I still have control of volume/balance/trebel/bass/fader/etc. through the PCM interface?

Link to comment
Share on other sites

  • Moderators

You need to come to one of our work on cars day in San Jose. Then you need to have Raman there.

Not sure what your question is, but with MOST the units communicate to each other via the fiber optic MOST system. If you remove a unit from the optic link then you will have a problem. Your PCM cannot then talk to another amp.

The copper speaker wires are not the issue.

Perhaps Raman will see this and give you his input. Jeff

Link to comment
Share on other sites

Yeah, that was the question. If I (a) keep the head unit, and (B) remove the BOSE amp, could I replace the BOSE amp with another (non-MOST) amp? And if the answer to that was yes, would the PCM interface control the new amp. Sounds like the answer is no to both. I guess I can still upgrade the speakers.

Edited by acourvil
Link to comment
Share on other sites

You're correct, you can not upgrade just the amp, unless someone comes out with a MOST compatible model. You certainly can upgrade the speakers but I'm not sure how much of an audible improvement that will be.


Link to comment
Share on other sites

I've tried to find MOST-compatible components, but the only ones I've seen are OEM parts.

I could probably live with the Bose system except for the distortion that I'm hearing in higher frequencies. It's particularly obvious if I turn on a AM station; voices and other sounds end with a sort of buzzing sound, almost like someone was mixing the voice with the sound of paper ripping. I can also hear it in CDs, although it less obvious with a fuller sound spectrum. And it seems to come from front and back speakers on both sides, although the front passenger side sounds a bit worse than the others. I guess I could take it in and complain to a dealer, but I'm kind of skeptical that the service people there will do much on the sound system.

Edited by acourvil
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.