The driver has a bit less mechanical clearance than most of the drivers typically used, also it has a shorter 'clean' throw than most. While it doesn't require massive amounts of power, it will do fine down low as long as you don't put too much power to it and 'break' it.
A Behringer A-500 might be just about right for these drivers, but I would cut down the sonotubes some and give them around 13 ft^2 each after port displacement, and stick with an 8" port, also raise your tuning some, I would suggest around 16 hz-17 hz.
Output wise, they should hang with a SVS Ultra-13 in 15 hz mode. Yes, the SVS has a smaller enclosure, but the driver is a long throw unit, as well as having a much more powerful amp.
You need something like the Behringer Ultragain MIC PRO 2200 for high pass filtering duties... yep, it's $ 100, but it will protect your wallet from having to buy more drivers.
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