Sub for Sonus Faber Guarneri Homage

I use REL and you can drive them either off preamp outputs or off the power outputs of the amp. Both REL and I think that is the better way. This way you are not running your signal through any additional circuitry; you will get exactly the same sound you have now plus the bass will be filled in. You can still run the signal through the subs and out to the main amps if you want, some like it better as it allows you to roll off the main speakers, I prefer the other way myself. The only problem with using the power output would be if you go to mono amps and place them next to the speakers, you would have to get a custom cable made up. You will be surprised at how much the bass adds even to music that is not suppose to have a great deal of low bass.

Thanks for your answer, but didn't quite understand which is the best way you recommend: preamp vs amp outputs. Cheers,

Amp output is what REL recommends and I use, but if you use mono amps widely separated you will not be able to use the standard cable.

You should take a look and a listen to the Wilson Benesch Torus Infrasonic Generator (sub) It can mate with virtually any speakers very fast.