I believe that crossovers are factored into the equation when multiple drivers are used. I wish I knew the technical aspect of all of this but I believe that if the windings were adjusted that you could have an 8ohm cab without much problem. There ARE other audio speakers with a 6 driver configuration that are 8ohm.

Playing with the number of windings changes the strength of the magnetic field in the driver. You can't change that without fundamentally affecting the sound of the speaker.

I will be looking into why guitar and any other musical instrument speakers (including PA) can have the SAME speaker made with different impedances.

Because they don't care as much about how it sounds.

Don't say that to a guitar player with a loaded guitar.

OK, try this one: because they're either a single driver or multiple of the same drivers.

Oh, you're GUITARDED... I'll speak slower then.

Old industry joke.

There's tons of them once you cut through what the musicians are trying to say:
"It's got a good growl" = "I'm driving the amp into clipping"
"It's punchy" = "I could only afford a 2x8 cabinet"
"That mellow part" = "The part where I turn off one of my chained Co Pro Rats"
"I play guitar" = "Just ignore me"
"I play bass" = "I handle the money and the band hates me"
"I play drums" = "I'm homeless"
"I sing" = "Mommy didn't love me"
"I'm the sound guy" = "I downloaded Audacity"
"I'm an audio engineer" = "I pirated Pro Tools"
"**** you" = "I'm the actual audio engineer"

(tongue planted firmly in cheek)

Bren R.

To be more specific on my original point: musicians are looking to create a sound. Perhaps that sound has distortion (I rather like that sort of sound) or is overdriven. But that's cool--audio enthusiasts are looking to reproduce a sound that has already been generated and committed to recorded media. Accuracy is (or should be) paramount. Therefore, you don't screw with the speakers to make them any given impedance with the end goal simply to be to change the impedance!

And if you don't think there aren't other 4 ohm speakers out there, I'm sorry, but you simply haven't looked. Magnepans spring to mind as excellent speakers that are 4 ohm (nominal), and, incidentally, are much harder to drive than M80s. I believe the old Dunlaveys were 4 ohm, as well.

It's funny how people read things. I NEVER said that there aren't any other 4 ohm speakers out there. Heck, the names I know now I didn't know existed 3 weeks ago. Who knows how many more makes there are out there.

btw I'm done with this topic. I don't know enouh about this topic to discuss this any further.

there is always Google.