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This is called the "Concert Sound System". It was advertised as a 200
watt 12 speaker system which was optional equipment for any 505
sedan. It was standard equipment on all '88-'89 Turbo sedans however.

The FTC doesn't regulate car audio claims, so one has to be careful.
Like any auto sound system, the "200 watt" rating isn't exactly that.
Instead it is a peak rating of all the channels combined (into a 2ohm
load at 10% distortion). It would be more accurate to say it is an 8
channel 12 watt RMS (into 4 ohm @ 0.1% distortion) system.

Most people don't realize that most of their music is heard with no
more than a few watts to each speaker--and doubling the wattage only
yields a 3db increase in sound (1 db is almost unnoticeable). In
other words, a real 1000 watts is only marginally more loud than a
real 500 watts. Any EE or just someone who is electronically savvy
will confirm this.

The Concert Sound System idea is really cool--each amplifier module
(4 total) houses 2 bridged amplifier ICs which are fed via a built-in
active crossover. This is also referred to as a "bi-amp"
configuration.

You will not find any passive crossover components in the system
(i.e. no capacitors or inductors in series with the speakers).

Each front channel consisted of a 5.25" woofer in the kick panel with
a 2" cone tweeter in the dash. Each rear channel had a 5.25" woofer,
a 2" cone tweeter, and 2 small mylar dome tweeters--the 3 tweeters on
each side all used the same amplifier circuit.

The input section of each amp module has a pretty substantial dummy
load, so you need to use the amplified outputs of the radio, not the
RCA style line level outputs.

Please remember that the installation of a coaxial (or, ugh,
triaxial) speaker in the place of the woofers is pointless--since the
amplifier module has an active crossover, the woofer circuit will
always recieve lower frequencies. In order to keep it logical, it is
best to use component drivers just like they did originally.

The woofer cone size is 5.25", but a normal 5.25" speaker will not
fit. The "basket" of the speaker is probably a metric size that's
closer to 6".

I have found the *perfect* replacement for the odd size woofers. It
is from RadioShack and it works great. I think it's around 89db @
1w1m (which is sufficient) and is 4 ohm just like the original. It
also fits almost as though it was designed for the 505. I think the
part number is 40-1422... but I'm not 100% sure. They're only about
$10 each.

MCM Electronics sells a Pioneer cone tweeter which fits perfectly in
the original spaces and seems to work really well. When I restore
those rear speaker assemblies, I just leave out the dome tweeter deal
and pretty much duplicate the front setup--one woofer, one tweeter.

Does anyone have a car where the original dome tweeters still
function? I think the Sun pretty much kills the rear drivers after 12
years. Every single Concert system I've heard lately is all bass, and
crunchy bass at that--the tweeters no longer work and the foam
surround for the woofers has disintegrated.

There are some mods which can be performed to the amplifier modules,
so those of you who are interested in keeping your Peugeot more-or-
less stock, but want a lot more fidelity from your sound system,
listen up...

There is an unholy number of coupling capacitors inside each amp
module, and they're completely unnecessary except for one. All these
caps not only induce some distortion, they also make the low
frequency section roll off 3 db at around 70 Hz.

Plenty of "punch" bass comes through--too much actually with that
blasted "automatic loudness" function in the stock Alpine head unit.
But no low bass can make it through, a pity. There are also some
crossover tweaks which can be performed. All the carbon-comp
resistors are booted in favor of new ones, and most of the small-
value electrolytic caps are junked in favor of some nice
polypropylene ones.

Overall, a bunch of input components are removed from the PCB, and a
few are changed. I can get more details if people are interested, and
we may even offer a swap program--where you pay a small fee, we send
you some professionally modified and upgraded amp modules, and you
send us your cores.

-Joe G

--- In peugeot-L@y..., "Smith Family" <smithm14@c...> wrote:
> My 89 505 turbo seems to have a "premium" sound system that looks
like it
> was from the dealer. There appears to be an amplifier on each rear
speaker
> (in the rear deck) and one with each speaker in the front kick
panels. Can
> anyone tell me about this system? Should the outputs from my
replacement
> radio/CD be the amplified outputs or the pre-amp outputs?
>
> Thanks,
> Harry Smith - Michigan

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