Well guys.......I'm slowly learning....
Some of you informed me that "under-powering a cab is a myth" and I was a little skeptical of such a claim. My thought (like many others probably) is that my Acoustic B600H just didn't have the output to make any of my cabs sound good. The prevailing TB thought was that it was my cabs that were the weak link (power handling was too low), and that my Hartke 3500 and Acoustic B600H heads have plenty of power.
I finally put that to the test.
I ran my B600H into the Acoustic 410 cab I have at home, and cranked the gain and volume to about 50%. It was loud, but sounded pretty bad.
Well, last night I plugged my B600H into our church's 2x15 vertical stacked, ported sub cabinet rated for 1200W @ 4ohm. This was a real test to see how power handling of the cab would impact the sound.
I was literally
blown away. I had the volume/gain at about 20% and I couldn't stand in front of it. My ears are still ringing from the bass awesomeness that came from that cab. We switched it to "full range", which I'm not sure what the range is for the enclosure and/or speakers, so the crossover wasn't engaged (I think). Obviously, those cabs were built to primarily function as subs, and as such, they didn't have some of the frequencies I typically put into my sound, but the punch, power, and low end were astounding.
Lesson learned. Myth debunked. Now I'm getting somewhere! I have 100% confidence that my current heads with a little EQ and maybe some kind of DI pedal going into a vertical stacked 2x12 or 2x15 would be amazing.
If you've read this far, congrats. I appreciate all the free advice and lessons from everyone so far. I have a lot to learn, but I feel like I took a big step forward last night.