Pioneer makes some great product, but there subwoofer set ups are not the greatest. Since I always say buy once and buy the best I would suggest getting something custom built.

I spoke to my Pioneer Rep today, since I am not in the UK my model numbers in the USA are different. But I think that the unit you want to use contains a 8 inch driver. It will be better IMO to use a 10 inch driver, if my guess on the 8 is correct. But it depends on the money you are willing to spend for sound and looks.

For what its worth I do not like the subwoofers playing any higher then 80Hz.

Regards, and good luck on your choice.