Thanks so far for the advice ...

I'm thinking the BK Electronics Monolith as that's very similar to my REL Stadium 3 that I use for music and very happy with it and was in my previous home cinema setup but cant find a Rel Stadium 3 atm apart from a very silly priced one on eBay.

I have looked at Meridian subs and imho they are poor.

Home Cinema: 861v4, 4x DSP5000, DSP5000C, SW5500.
Music: 47 laboratory - Shigaraki CD Transport, Mark Levinson 335, Benchmark HDR DAC, Dynaudio C1's, REL Stadium III.