Bryston 7BSSTs are perfect for low bass control. I use them as my sub amps and love them. 800 watts into 1-4 ohms. Figure 4-5K for the mint ones with lots of warranty left.
Damping factor has very little to do with bass output. My ksa 300s has a damping factor of 150 and has great bass. It's the size of the power supply that matters most. I doubt you will find anything with a power supply as large as those krell amps.
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