Re: 405 Mi 16 car stereo issues
From: Dick Sears
Date: Wed 11 Dec 2002 - 09:19:25 EST
Doh! That's what I get for figgerin' in my head late in the work day.
4/3 = 1.333, not 1.667.
Most modern aftermarket amps specify 2 ohms as the low limit for
impedance per channel. I certainly wouldn't trust a factory radio to
go lower than that with impunity.
-Dick
89 Mi16
85 Alliance ragtop
87 GTA ragtop
(and, um, 93 Saab 9000CS)
All with aftermarket sound - we like it top-down and cranked!
--- In peugeot-L@yahoogroups.com, "Wayne Burton" <wburton@t...> wrote:
> 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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