Subwoofer recommendation for jazz and rock

Hi,
I've got a simply setup with a pair of Sonus Faber Concertinos, and a Musical Fidelity A3.2 amp. Source is CD or my Thorens turntable.

I find that I have trouble hearing the bass parts in jazz trios, and that rock can use more... energy. What is a good recommendation for a sub, in keeping with the modesty of the rest of the system?

I'm interested in the REL, especially the T-0. Would this integrate well? Also, below is a photo of the rear of my amp- how can I connect a subwoofer?

thanks!

http://img.usaudiomart.com/uploads/large/966445-musical-fidelity-a32-dual-mono-integrated-amplifier-32-made-in-england.jpg