Re: Re: 405 Mi 16 car stereo issues
From: fred smith (peugfan@juno.com)
Date: Wed 11 Dec 2002 - 22:37:28 EST
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@telus.net>
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@BioTek.com
> 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@BioTek.com>"
> <SearsD@BioTek.com> 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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