Hi Collen. Nice to have you here. One of the things that you should consider when deciding which sub to buy, is how much air the sub will have to move. If you could give us the size of your room WxLxH, and the size of any adjoining spaces like a dining area, or foyer, which are open to your primary listening area, we'd be better able to give you some advice on which direction to go. With those dimensions we can figure the cubic footage of you space, and give you an idea of what will work in that space.
Another question is, does your receiver have a subwoofer RCA output jack. Or, would you be running speaker wire from your receiver to the sub, and then from the sub to the speakers. This would tell us whether you would be using the
crossover in the receiver (if it has one) or the crossover in the subwoofer.
I'll echo JohnK's statement that balancing your sub to your Axioms is NOT complicated. I'm not familiar with your receiver, but if it has a speaker setup menu, it will probably provide some test tones. They and a
Radio Shack Sound Pressure Level Meter. would be all that is necessary to balance things.
If your receiver doesn't have test tones, something like the
Sound & Vision disk would do the job. This disc will walk you through the whole process.
If you use the tones in your receiver, here are some tutorials that will give you an idea of how to do the job.
Essential Accessories: The Radio Shack Sound Pressure Level Meter
A Quick Overview of Home Theater Calibration
And, of course, everybody here would be glad to help you in any way we can.
