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.
Lowend amp
Have had Krell Ksa 250 and 300S as Well as Ksa200.
Love the lowend control for B&w speakers.
Now these things are older wondering what amps have similar lowend control that are Very reasonably priced?