Re: Re: 405 Mi 16 car stereo issues
From: Wayne Burton (wburton@telus.net)
Date: Tue 10 Dec 2002 - 22:55:47 EST
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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