[T3] FW: radio in
Jim Adney
jadney at vwtype3.org
Sat Jul 12 05:03:15 PDT 2014
On 11 Jul 2014 at 21:55, Dennis Stiefel wrote:
> Actually I've tried just doing one speaker on each channel (having 2 instead
> of 3 like it is now).
Typical speakers are 8 Ohms. If you put 2 in parallel, you've reduced
the resistance to 4 Ohms. Three in parallel will put it at 2.666
Ohms. So the current you're asking from the radio has gone from, for
example, 1 A to 3 A. In the electronics world, that's a big
difference.
If you put the 2 rear speakers in series, they now measure 16 Ohms,
so putting that in parallel with the front speaker now asks the radio
to drive 5.333 Ohms. So the current in the same example will now go
from 1 A to ~1.3 A. That's not such a big deal.
The current you actually ask the radio to provide depends on how far
up you crank the volume, so if you keep things moderate, you can get
away with a lot.
Some of your posts seem to imply that this is a stereo, which is
unusual for a Sapphire from our era. If that's the case, consider
wiring the rear speakers as L & R, and then combine the ground
returns from them into one conductor and pass that thru the dash
speaker. This creates a "center channel" which might work nicely, but
note that you can't do this unless the 2 channels have a common
ground. Keith can probably tell you if this will work on the radio he
fixed up for you. Be careful. If you do this wrong, you'll damage the
radio.
--
*******************************
Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
*******************************
-------------- next part --------------
A non-text attachment was scrubbed...
Name: WPM$RQAY.PM$
Type: application/octet-stream
Size: 1911 bytes
Desc: Mail message body
URL: <http://lists.vwtype3.org/pipermail/type3-vwtype3.org/attachments/20140712/8852cf00/attachment.obj>
More information about the type3-vwtype3.org
mailing list