Which Rel subwoofer

All I can say is I've had several RELs and had reliability issues, stay away from REL!

Xti-16

I have the original C-1.

Sksos1,

There are a large number of REL models out in the world. Which did you have issues with?

And how was support from REL when these issues did come up?

Loved my REL Storm III when I had need of it. Best sub I have owned to date. (But also the highest end sub I have had to date).

Taters - Personally I would go with a sub that goes the lowest. Especially if you are trying to get what the C1's can't physically do then consider a crossover around 36 - 38 hz. I think you'll find there are not too many recordings that go much lower than what the C1's can do. OTOH if you were thinking of crossing over around 80 hz what you will get is what the C1's can't do BUT adding (probably doubling) to what is already there and may sound real boomy. In that case I would recommend any sub or one that doesn't go very low at all.

I asked which C1's you had because of your response to Pass XA 30.5 with C1 sigs thread. 100w tube amp and wanting more power. Even when I had the originals both the Octave V40se and V70se are more than enough power (even when using EL34 output tubes). What amp do you have? Also for me I don't listen loud and the MKII/Sig is as good or better than the originals when cranked up to sound the best. That being said the MKII/Sig may not actually get as loud (but super close) as the originals before bottoming out.

Xti-16,

I listen very loud so that is why I feel I need more power. If I listened at a low level I would have enough power.My Amp is a Audio Research VT-100MKIII.