take a look at
http://hyperphysics.phy-astr.gsu.edu/hbase/audio/imped.html
which explains impedance matching.  As the smart guys before me
said ( Jinx and Blick ), the guys at the guitar shop don't know what  
they
are talking about.  The main thing is that if you drive too much power
through the speakers, it is bye bye speakers.  Play at a reasonable
level and have fun... crank it up to 11 and watch the cones fly.
Cedric

Mario Mendes Jr. wrote:
> I have 2 unused Becker speaker boxes (specs below), that I'd like to
> use to make a guitar amp box.  I went to a local guitar shop to see
> if they sold just the amps, without the speakers and explained that I
> wanted to use it with these speakers and they told me I was going to
> ruin them.  They couldn't really tell me why it would ruin them, just
> that it would happen.  One of the guys said it had something to do
> with the fact they're 4 ohm speakers and not 8 (makes sense, since
> each is half the load a guitar amp is expected to drive), which led
> me to say, "just wire them in series", and again I got a "it does not
> work like that".
>
> So my question for you guys is, can I wire them serially and hook
> them up to a 600 watts amp?  I won't be using that much power in the
> house, but since the speakers can handle it, I'd like to have the
> ability to drive them that loudly should the opportunity present
> itself.
>
> 300 watts RMS 4 ohm 3 way crossover 15 inch woofer
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