Subwoofer help??

[Themoth]

I am debating on changing out my current subwoofer, mirage fx-8 for a Kef PSW2150. I have the specs listed below and wanted to get some thoughts n this matter. thanks

PSW 2150 specifications
Design Powered subwoofer
Drive unit Slot Port design 10 in. (250 mm)
Frequency range 30 Hz - 140 Hz
Amplifier 250 W
Maximum output (SPL) 110 dB
Internal volume 40.4 litres
Weight 40.7 lbs (18.5 kg)
Dimensions
(H x W x D) 16.5 x 15.0 x 15.8 in.
420 x 380 x 400 mm
Finishes Black

The FRx-S8
incorporates its own discrete 100 watt MOSFET amplifier with an 8" heavy-duty woofer. Frequency response ranges between 29 and 150 Hz, ensuring a seamless blend between the bass output of the subwoofer and the mids and highs of the satellites.