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  #1  
Old 10-16-2004, 03:59 PM
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Join Date: Jan 2003
Location: Innisfil, Ontario, Canada
Posts: 93
7 channel BOSE amp died totally 92 W140

Hello all!

Well 1 1/2 years ago ai Installed a new head head unit and sub woofer amp in my 1992 300SD W140. This was due to NO cd and the subwooer channels were doing the squeking and poping etc. that the BOSE amp does.

A few weeks ago my left front speaker started the SQUELAING noise on start up and then a couple of weesk ago it totally died, only my subwoofers working on their separate amp. But at the same time my Sony HU radio reciever has died too. The CD woorks OK as does the changer.

the system sounded AWESOME with lots of BASS!!!

so... my delemia is... Choices! LOL!!
First....
1. have to replace or repair the head unit. It' almost 4 years old. I liked the HU separate Front and rear pre-amp amp out and Sub pre-out.
then....
2. Repair the 7 channel amp and run system as it was.
or
3. Install after market amp (s). HOwever I have heard the factory BOSE speakers will sound HORRIBLE without the BOSE amp's crossover/EQ system.
Is this true?

I feel option 2 is the most cost efective, Is it cost efective to reapor a 4 year HU? It was $450 CDN 4 years ago and had a 3year warranty!! LOL!

any other ideas?

Steve

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  #2  
Old 10-17-2004, 01:54 PM
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Join Date: Feb 2004
Posts: 501
Hey,

All I know about the bose speakers is that bose will not give you the specs on their speakers therefore you wont be able to match an amp up right. The cross overs are probably altered a little just to spite the world and not be able to use bose speakers separately.

Good luck,
Peter
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  #3  
Old 10-18-2004, 11:19 AM
3 MB's and counting!
 
Join Date: Apr 2001
Location: Toronto, Canada
Posts: 1,825
Id say fix the bose amp and maybe get a new head unit......that would be the best.

What kind of music you listen to in the car? Im from Toronto.
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  #4  
Old 10-22-2004, 10:58 PM
Elec_little_Mech
 
Join Date: Oct 2004
Posts: 14
My experience with BOSE amp designs is that they run sub-ohm output impedances <0.5 Ohm and not the usual 2-4 Ohm on other amps. This will have a serious effect on external cross-over's frequency response designed for the usual 2-4 Ohm impedances.

There are some easy ways determining the specs of a speaker using an audio signal generator, AC voltmeter, sealed box with opening for speaker etc. if you have this equipment at hand.
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  #5  
Old 10-26-2004, 05:25 PM
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Join Date: Apr 2002
Location: Lakeside, Ca.
Posts: 350
Amplifier problem

Hi dieselsteve,
The amplifier is a 7 channel amp. With 2 front amps, 2 rear amps, 1 center channel amp, and 2 sub amps. To replace it would require an minimum of a 6 channel amp. The center channel is not very critical since it is located behind the rearview mirror. To get it repaired would be the least expensive way to go. We service the amplifiers and provide a 3 year warranty to back up our service. Let me know if I can help you further.


Cleeve Morrison
La Jolla Audio Repair

www.mercedesradiorepair.net

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