[s-cars] Bose head unit notes
Strangconst at rogers.com
Mon Jul 19 22:34:55 EDT 2004
Actually that is fairly low level.
A lot of high end components now seem to be 5 volt or even 10 volt.
Makes noise a thing of the past.
----- Original Message -----
From: Kevin Day
To: s-car-list at audifans.com
Sent: Monday, July 19, 2004 10:11 PM
Subject: [s-cars] Bose head unit notes
There seemed to be a bit of confusion in the archives as to whether the
stock Bose (Blaupunkt) head unit can be mated to aftermarket amps and
For the record, the Audi/Bose Gamma CC unit in the Ur-S4 has fairly
standard (for car audio) line-level outputs. I measured 1.8 Vrms
maximum at the input to the rear amplifier. For the measurement I
burned a 1 kHz sine wave at 0 dBfs onto a CD and turned the volume
all the way up with the speakers disconnected. Tone controls were flat.
I do not believe that the head unit is doing any equalization of the
signal. I have it on good authority that the EQ in Bose systems of this
vintage is done in the amplifiers, using good old fashioned RLC circuits.
A visual inspection of the amp PCBs seems to confirm this. (There are 3
different amp part numbers, incidentally: LF RF and rear.)
In any event, after confirming that the output was normal
I hooked up an aftermarket amp and a new pair of 6x9s in the back. It
sounds pretty good, considering I haven't done the front yet.
Anyone have words of wisdom to share regarding wiring up the front
speakers to an amp in the trunk? Wiring routes?
S-CAR-List mailing list
S-CAR-List at audifans.com
More information about the S-CAR-List