Re: 405 Mi 16 car stereo issues
From: Dick Sears
Date: Thu 12 Dec 2002 - 11:48:36 EST
Great call on the tweeter suggestion. There was always something
missing sound-wise - the factory dash tweeters were basically
inaudible relative to my aftermarket high-sensitivity door speakers.
After your post I scooted right out to Radio Shack and grabbed one of
the last pairs of Optimus tweeters (they are indeed dropping car
audio), chopped the wires off the factory tweeters, spliced in the
new ones, and stuck em off in the corners (double-sided stickies
included) where the sound reflects very nicely off the windshield. A
huge improvement in sound fullness and stereo imaging - not bad for
only $14.99.
Danka mucho - Dick
--- In peugeot-L@yahoogroups.com, fred smith <peugfan@j...> wrote:
> Yup, that sounds better. So either I disconnected the original
tweeters
> when I put in these little supertweets, or the originals were blown,
> causing me to want more screeching highs.
>
> Then kyew.
>
> fs
>
>
> On Tue, 10 Dec 2002 19:55:47 -0800 "Wayne Burton" <wburton@t...>
> writes:
> >Actually the formula is almost right. it should be (r1*r2) /
(r1+r2) =
> >Rc1 then Rc1 * r3 / (rc1 + r3)
> >thus 4 * 4 = 16 / 8 = 2
> >then 2 * 4 = 8 / 6 = 1.3333333
> >Since the current is split equally at each division, the current
must
> >be calculated for each division separately, no matter how many are
in
> >parallel. If there are more than 3 sets, there is another formula
> >which is easier
> >
> >No IC stereo amplifier can handle this impedence for very long,
> >especially in a car stereo because of the current limitations of
the
> >IC design. Discrete component amps, are better able to deal with
this,
> >but are quite high end nowadays.
> >
> >Impedence can NEVER increase in parallel circuits.
> >
> >Wayne Burtn
> > ----- Original Message -----
> > From: fred smith
> > To: SearsD@B...
> > Cc: peugeot-L@yahoogroups.com
> > Sent: Tuesday, December 10, 2002 4:06 PM
> > Subject: Re: [Peugeot-L] Re: 405 Mi 16 car stereo issues
> >
> >
> > We may need Jim L. to decide this one.
> >
> > The formula for parallel impedance is: r1 times r2 divided by r1
> >plus r2.
> > I've never heard it expressed for three impedances, so I'm not
sure
> >if
> > this formula would still hold true.
> >
> > If it is correct to extend it, it would be thus: r1 times r2
times
> >r3
> > divided by r1 plus r2 plus r3. That would be 4 times 4 times 4
(64)
> > divided by 4 plus 4 plus 4 (12) = 5.333. Most amps would have no
> >real
> > problem with that.
> >
> > Dr. Bose? Anyone?
> >
> > fs
> > (I am not an electronics engineer, I merely play one on the
> >Internet.)
> >
> >
> >
> > On Tue, 10 Dec 2002 22:01:40 -0000 "Dick Sears <SearsD@B...>"
> > <SearsD@B...> writes:
> > >Just be aware that if you wire the new tweeters as described
below,
> >
> > >you'll have 3 speakers in parallel (including the door
speakers) on
> >
> > >the same channel. At 4 ohm impedance per speaker (standard for
car
> >
> > >audio), that works out to about 1.7 ohms impedance per
channel.
> >I'm
> > >not sure about the Alpine factory head unit, but many
amplifiers
> > >won't handle such low impedance happily. To be on the safe
side,
> >you >
> > >might just want to replace the old tweeters with the new ones.
>
>
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