Well, not all speakers are created equal. Some are tight, some are loose, some are fat, some are thin, some are bright, some are dark, and the list goes on. Now, when it comes to speaker size, yes, larger speakers push more subs and bass than smaller speakers, but what really matters is what you might refer to as response time. A 15" speaker tends to not respond as quick/tightly as, say, a 10" speaker, which gives the speaker more of a "slug" effect (as in the sound, slug, like chug -- does that make sense?). Metal guitarists in the 80's would use 15" speakers to get really "chuggy" palm mutes. Of course, if you listen to metal recordings from the 80's, the guitars are stepping all over the bass's toes. The bottom line is: what sort of sound are you looking for? Also, one 15" speaker and cabinet will sound quite different from another 15" speaker and cabinet. Jazz guitarists also seem to like 15" speakers, but more for the natural treble attenuation that occurs in the larger speaker. God bless.

JRSTAR666 wrote: Hello! I'm currently using an old 15" speaker w/ 2 2" horns (monitor) as a cab for my guitar head (In my small office). I want to make a speaker isolation box but am wondering if I should ditch the monitor set up and buy a 12" instead. Any tone wizards out there?

What kind of music? An iso cab with horns would probably hurt! I'm assuming you're trying to play blues/rock/metal/funk/etc through an amp and a monitor speaker? Not the best choice.

A monitor speaker MAY be OK for a passable acoustic guitar amplification system, but not for electric guitar. As mentioned, it full-range music reproduction speakers and guitar amp speakers are NOT created equally, despite looking kind of the same.

Get a small tube amp combo, and crank that little bugger. May not even need an "iso cab".

Kapt.Krunch

I play metal/rock, mostly using drop D, occasionally playing drop B. I use a 100 watt Peavy ValveKing head.

I recently acquired a full stack, which has one 15" and one 10" (name brand "Blues") speaker in each cab*2. Two monitors, one of which was mentioned in the last question, came with these cabs. These four pieces are really old and need new box's/cabs.

Basically I'm trying to put together something really cool with these 4 15" speakers. I'd have four 2" horns and two 10" speakers leftover. I'm thinking about two really loud and B.A stage monitors OR trying rig up some kind of guitar cab/stack. Maybe two 15's in each (this is where the tone/recording comes in). So, I'm not sure if it'd be smart to make a cab out of these or not.

It all depends if you like the sound. Knowing what is and isn't good tone for a mix is essential, though. Selecting what size speaker you will use is like choosing what size crash cymbal to use: sure, 13" and 18" crash cymbals do get used, but there's a reason 16" crash cymbals are used most frequently.