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2X10 and 1X15; Does it Matter Which is On Top?

Shouldn't matter in that situation. If you're concerned about doing it all "right", stand the 210 on it's end so the speakers are all aligned vertically instead of side by side to eliminate comb filtering. Also gets them closer to your ears instead of hitting you in the back of the knees.
 
I now have two cabs, a 1X15 and a 2X10.

Traditionally the 15 goes under the 10s. In my case, the 15 is quite a bit smaller than the 10s, and it's more stable with the 15 on the bottom.

Does it actually matter?

There's really no right or wrong way here, but it will almost certainly sound different because of the proximity of the floor and certain low frequencies being reinforced. Use it the way it sounds best to you with your particular EQ requirements.
 
There's really no right or wrong way here, but it will almost certainly sound different because of the proximity of the floor and certain low frequencies being reinforced. Use it the way it sounds best to you with your particular EQ requirements.

+1

I was using a 2x10 + 1x15 combo for quite some time. I found that the combo sounded much better with the 15 on top. YMMV. Just try 'em both ways and see what works for your equipment and ears.
 
I have an Ashdown EB 180 15" combo and an Ashdown Mag 210 extension cab that when I have them both hooked up I but the 210 on the bottom because it has a bigger footprint and is physically more stable that way... Someone said something about standing the 2x10 on its side to line up all the speakers... is it OK to do that (not bad for the cab in any way???)
 
My main rig is an Eden D115 & D210T, & I've experimented with stacking them either way (15" on top vs. 15" on bottom).

It doesn't necessarily sound "better" one way or the other, though it does sound different. I can't decide which one I prefer, so I keep thinking I should just get one more of each and stack 'em both ways simultaneously!

(Actually, there's a good argument for getting 4 cabs and inverting 1 stack on top of the other, so that it's (from bottom to top) 15", 2x10", 2x10", 15".

There's also a good argument for not wasting time dreaming of 7' tall speaker stacks...)
 
So far they sound better with the 15 on top. A lot better.

This was my experience when I had a Bergantino HT210 and HT115. Of course this is concerning the sound the rig produces only, not the sound the PA makes if you're in a large venue and using a DI or mic.

When I was at a Tony Franklin appearance where he was pushing SWR, he had his 15 on the top and 2X10 on the bottom, when asked about it he said it sounded better that way.
 
I have an Ashdown EB 180 15" combo and an Ashdown Mag 210 extension cab that when I have them both hooked up I but the 210 on the bottom because it has a bigger footprint and is physically more stable that way... Someone said something about standing the 2x10 on its side to line up all the speakers... is it OK to do that (not bad for the cab in any way???)

Won't hurt a thing, you may find it easier by adding little rubber feet to the side of the cab (that would then become the bottom). This matters more if the audience is actually hearing your bass rig, if you're running through the PA just configure your rig so the guys in your band can hear it the best, whatever that ends up being.
 
im pretty sure it DOES matter... im sure bill fitzmaurice or someone can stop by and explain in detail.
To each their own, but tens usually have better midrange response than fifteens, so they will usually be better on top where you can hear them better. You also should have the 2x10 on end, the drivers vertical, unless it's one of those rare 2x10s that (correctly) have the drivers vertically aligned to begin with.
 
I’m with the other guys, if you are running direct then set it up however you want. If you are using the cabinets as you source of sound instead of the PA then yes it does matter, and both can be right. Lifting a cabinet off the floor will reduce certain frequencies and add to others. If you are in a room that is extremely bass heavy put the 15 on top, if you need a bit more put it on bottom. There are many variables in what I am getting ready to say, so every one please don’t attack me for this. As a general rule of thumb a 15 will put out more sound than two 10s , so if your cabinets are around the height level of the crowds head it could very well kill some one in front of your rig if the 15 is on top. On the other hand your 15 on bottom could over shadow the 10s. All in all it doesn’t matter which is on top or bottom; you will get different sounds from doing either, just listen to what the room is telling you J
 
I run an Orange head on Epi UL2 210 and 115. I like the 210 on top because I can hear the mids better, and because when I tried the 115 on top it was too loud (even though I always wear plugs) for me to stand directly in front of.