Originally posted by TobiasMan
I'm hoping that means they were hearing "good things". 
Absolutely - everyone was diggin' it. [8D]
Originally posted by TOM
Thanks for your answer!!!
I decided to do a quick visual for you, as well. [
This is a ripple-tank simulation of sound waves from a single source. Think of it as looking down from above on a vertical stack of two identical 10" drivers projecting sound:
As you can see, the signal is the same everywhere the wave travels.
Now, here are the same two drivers, as seen from above, in a typical horizontal set-up:
You can see there's a big difference here. In the center section is the full signal, and anyone standing in that inverted "V" will hear everything alright.
Then you have the black smears which define the "V" - those are areas of phase cancellation, where you wouldn't hear much of anything at all!
The areas outside the black seem to appear normal at first, but if you look closely, you can see that they are completely out of phase with the center section (green where red should be, and vice versa). These are the areas where the upper mids and highs are not audible.
You can see from the graph how a drummer or guitarist - or anyone not standing directly in front of the bass rig - couldn't possibly hear the full tonal characteristic of the bass... they'd be hearing it out of phase, and without the upper-frequency content.
This explains why everyone could hear me so much better when I first set my rig vertical at the rehearsal - my tone was filling the room, not just "beaming" in the center.
The lesson: If you want to be sure that the sound you hear in front of your rig is the same sound everyone else is hearing, stack identical drivers vertically.
You can tinker with ripple-tank simulator here:http://www.falstad.com/ripple/
...and I'd like to apologize to Flatball for hijacking his thread!