Hi, looking for a bit of advice.
Im changing up my system to use 5 B&W M1 satellite speakers and a subwoofer but not sure what I need in terms of subwoofer. My brother in law has M1’s with a pvd1 and it sounds awesome but is it necessary?
No it´s not necessary and most people here would advice you steering away from any B&W subs (ASW serie or the PV1D bowling ball which is highly overpriced). REL T5x is small and good looking, but we think there is better products movies in mind cause tiny 8" driver with 100w amp can only do so much.
Looking the ones you listed assuming you looking compact sized sealed woofer then have a look example SVS SB1000 Pro. You might get little discount from forum advertisers if you ask. SVS is probably one of the most known and largest company specialized in subwoofers. SB1000 Pro is smallest sealed sub in market with 12" driver, phone app control and very good performance. Long 5year amp warranty and great support/service is something that gives extra peace of mind. There is 3 finishes available for this model and naturally there is larger models if your budget goes higher close to 1k£.
AVForums - Best Buy. Small subwoofer cabinets are not conducive to big bass, which presented a challenge for SVS engineers when designing the SB-1000 and its compact 13x13x13-inch enclosure. Refusing to sacrifice performance for size, SVS engineers threw out preconceived notions and designed a...
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Review of the SVS SB-1000 Pro Subwoofer
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If you want something cheaper then BK Electronics builds their units in UK and offers more finishes also plus FF/DF driver orientation options. Naturally they lag little bit behind the big companies with older technology, but they sell direct to customer so the price is lower. Warranty is 2years for amps.
Of course there is lot more options depending how thick wallet you have and what you really looking.