Speaker Impedance Advice?

[Joe Hart]

I have an old Leslie Tremolo unit (rotating styrofoam baffle with two speed motor) that I want to box up to make a rotating speaker cab. My question is what speaker impedance should I go with? I'm thinking of tossing a 75W speaker in there, but what happens if I want to power the speaker with an amp that needs a 4 ohm speaker load, or another that wants 8 ohms, or whatever? I know that you need to match the impedance, but am I going to be stuck with using the cab with whatever amp I decide to use it with? Or is there a better way to do this? Or should I just take an amp that I have and move it into the cab with the rotating speaker and make it an all-in-one unit? I'm just looking for different thoughts and advice on this. Ideally, I would like to just have the cab and be able to use it with different amps, but I don't know how to get around the impedance issue. Thanks!
-Joe Hart

[Enzo]

DOn't worry about it. Mount the 8 ohm speaker if you have it.

If you use a solid state amp, it won't care in the slightest what you use as long as you don;t bust the minimum. All SS amps are good down to at least 8 ohms, most to 4 ohms.

If the amp has a 4 ohm rating, the 8 ohm speaker will draw only half as much power as a 4, but that is only a 3db loss in loudness. Besides, most people playing through a Leslie are not trying to fill a concert hall with it.

If you have a tube amp that expects 4 ohms, it won't harm it if you use an 8.

[Joe Hart]

Thank you. That is exactly what I was looking for and couldn't find using Google or the search on this site. Thanks!!!!
-Joe Hart