The speaker terminals should be marked + and - right on the lug you
connect your wire to.
Many new radio require independent speaker grounding. You will need
right/left and two independent ground wires. 4 wires in all. These radios
are called 4 channel.
With the OEM three wire setup radio will appear to work at low volume but
you will smoke the radio when you turn the volume up. (Blow one channel
or more and have mono)
As for speakers, they work on Watts, the more watts you put in the more
sound you get out, up to the point that you start getting distortion and
them just crap. Yes you can blow speaker out. You can also ruin them with
high volume. The best way to get big volume at low power is to install
big speakers.
When a radio is rated at 180 Watts, that means 180 divided 4 ways. So 50
watt speakers are OK. If you install 150 watt speakers that will work
too.
http://williamwareagency.com/forsale/stanvan/speakers.htm
My solution. Probably not the best but works for me.

Stan Wilder

On Mon, 25 Mar 2002 11:22:06 EST Brian Doss <Doss88Wkndr@AOL.COM> writes:
> I'm replacing my rear 4" speakers (because I removed the A/C).  The
> new
> speakers have a (+) and a (-) connection spade.  How do I know which
> wire is
> (+) ?  Is the (-) a ground wire? Will you burn something out if you
> get it
> wrong?
>
> PS - Will a 5.25" speaker produce better or more sound than a 4"
> speaker
> given the same input?
>
> As you can tell, this design engineer - carpenter - teacher knows
> squat about
> electronics...
>
> Thanks
> Brian Doss
> '88 Weekender, Queequeg
>

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