Which REL subs for ProAc One SCs?

I use a REL Strata III with ProAc D30R.. My room is 15x 25 works great have the crossover at 34hz.. I've been considering a upgrade but it's down on the list after my PS Audio DirectStream Dac upgrade and my Auralic Aries..

I use two subs with my SC's, both are NHT SW2's, which have outboard amps. I have the subs on spiked amp stands, with cushioned auto wheel rings under the subs. How I came to that configuration is a long story, but they work very well. The only way you are going to know if two are better then one is to try them together. Purchase where you can get a return accommodation with full refund within 30 days. If one works, take the other back.

Thanks again guys.

Sc53 is the Neutrik made by REL or is it separate?

Erik, I wish I coujld afford a D30R right now. I've spent some time listening to the D40R, it was magical. Has to be in my future though.

Bob, yes I am worried about that stress. While sending some bass energy to the sub will help, still it's a big space and I do listen loud. My RM9 will easily overwhelm the One SCs. I guess I'll just have to find out. If I end up selling the ProAcs the sub will be useful anyway. I wonder if it would be useful to set the high pass at a higher frequency? The woofers in the One SC are small.

Velodyne makes the SMS-1. Don't know if it has a parametric or if it differs from Hsu's network. What is the advantage of a built in high pass vs. the REL with an external?


Thank you,
Jim

Thanks Larryi for the link, I'm going to check it out now.
Jim