Newbie needs serious sub help

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I have been reading through some DIY projects and thought I would try one myself. I have a very small budget so I figured I would use some speakers I have lying around the house since it would be my first project. When looking through my speakers I ran into a problem. I have heard that you cannot mix 4ohm with 8ohm speakers. Is this correct?
I would be using a Bose 2.75" tweeter(8 ohm), a Bose 6.5"mid/woofer(8 ohm), and a 12"SVC Cerwin Vega subwoofer(4 ohm). Is this a waste of time? Thanks for your help.
 
Um, lesse... if your amp is 8 ohms, then the two 8 ohm speakers in parallel, + the 4 ohm sub in series, will get a good impedance match.

In the real world, this probably won't work right, and something is telling me you'd need a capacitor across the sub (as opposed to a series inductor) to shunt higher frequencies away from it, and pour into the other speakers instead.

Tim
 
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