Quad ESL 57 with subwoofer

All you need are,8-10" subs, a pair is ideal. Drive them from your main amp using the high level inputs, so not run cables from your preamp, set the crossover at 40Hz, adjusting the volume to blend, use a piano and a vocal recordings, when either becomes to thick/heavy sounding you raised the volume to high, after you are happy try 50Hz, you may have to adjust the volume  a bit, choice is yours on what you prefer, don't crossover higher than 50Hz. 

noromance
Has anyone tried adding a sub to a pair of Quad ESLs?
If so, did it work out?

When we played around with them with subs. The problem was the 57’s bass to where you use it to is very fast and agile as it is with all ESL’s
To mate this with a big diameter 12" 15" 18" slower sub for us was not successful, there was always a disconnect between the two.
We found it better to use subs the had 10" or less drivers with maybe even twin 8" and that were also servo controlled to mate up better with the Quads bass.
And I agree with phillyb 2 stereo subs are better each next to or behind each Quad run off the L & R preamp outputs (not from the mono HT sub output)

Cheers George

Thanks guys. I ended up removing the old REL and adding it to the other rig. It burned out anyway and I replaced it with an S3 which is MUCH better. The Quads sounded better without it. I've also removed the grills.
I was thinking of something like a pair of REL T5i.

noromance OP
I was thinking of something like a pair of REL T5i.

Nice but I think two of these will be better and faster 2 x 8" and servo controlled.http://www.rythmikaudio.com/FM8.html
Cheers George

@georgehifi Nice but they don't have high-level inputs which won't work for me.