Hi:
I am trying to decide between one LFM-1+ and two LFM-2s. Any advice would be most appreciated. My setup:

Paradigm Monitor 11 v.3 floorstanding speakers, bi-wired. Notwithstanding published specs, in my room they appear to have a useable bass starting at about 60 Hz.

Cambridge Audio Azur 640a integrated stereo (2-channel) amplifier - no LFE socket - my sub is now connected via pre-out.

CA Azur 640c CD player.

Pro-Ject 1 Xpression turntable, Sumiko Pearl cartridge, Bellari VP129 tube phono preamp.

My room is 18' x 16' with a 9-12' cathedral ceiling. It has wall-to-wall carpet but is quite live. I listen mostly to classical symphonic, chamber, and vocal music. Thus there will rarely be any need to go below 40 Hz (except for the longest organ pipes or the bottom of the piano), but a strong and smooth 40 Hz (lowest note on bass fiddle) is essential.

Finally, is it better to connect the subwoofer(s) via the pre-out or at speaker level?

Thanks!