I experimented with Rel subwoofers. Purchased two Carbon Specials to pair with my B&W 802 D2 speakers and my Gryphon Diablo 300 amp. Bought the upgraded hi-level “Blueline” cables too. I know many, many trusted audiophiles love these subs and they can work well. But my experience was different. What I found was:
1) While the bass was excellent it didn’t provide the effect that was expecting. I was expecting a bigger richer sound, which is not what I got. I expected bass guitar solos to stand out more and be more like a live experience. The frequencies that were boosted (when crossover and level were adjusted correctly) were lower than what would have made the sound richer. So yes you could feel the bass more, but the notes weren’t bigger or richer in any way (which in retrospect may not have been a good thing anyways) And,
2) While I can see how people say subs can improve the mids (they did in some ways), I couldn’t get the subs adjusted such that the vocals were perfectly focused.
My crossovers were set at 3 clicks and the level set at 5 clicks at the best sounding setting I could find (I tried everything). And I tried everything I possibly could with positioning. Some positions were better but I just couldn’t get vocals to snap into place and be natural. I had marks on the floor and I was at the point of making less than 1cm adjustments to the position or toe-in.
I spent the entire month trying to get things right, and failed. Returned them within my 30 day window and used the funds to go down the digital rabbit hole, which I’m entirely enjoying (see my MU1 thread). Never looked back and am somewhat relieved as my system just looks better too without the two subs on the outsides of my speakers.
Two things could have been a factor in the subs not working out: my room, and also my system is extremely revealing. This isn’t a good thing for all folks and can be a double edged sword. I can make the slightest adjustments and the effects are blatantly obvious to anyone. So things can be far more difficult to set up for me to ensure everything is right. But I simply couldn’t get there with the Rel’s, despite the fact that I know they make exceptional subs.
I’m now not even concerned with bass, although I could use some more in my large room. Just not missing it though.