Raul, whilst I may query your selection of turntables and arms on occasion, I must tell you how right you are about the utilisation of two subwoofers over one.
For 10 years I had a single REL Stadium II subwoofer integrated in my system and was quite happy with the sound. After installing the Halcro DM58 monoblocks, I found that they drove my full-range speakers down to the same low frequencies as did the REL.....so for the last 2 years I have lived happily without any subwoofers. Your thoughts, and those of Richard Hardesty in the Audio Perfectionist convinced me to try two subs in my system. I purchased two Vandersteen 2Wq subwoofers, and after some help from John Rutan of Audioconnection in integrating them properly, I must admit that everything you say about having two instead of one is correct. The extra extension into the lower octaves is probably the LEAST important improvement wrought. The entire musical presentation has rocketed to a previously unimaginable level. The 3 dimensional space between and behind instruments has snapped into such dramatic relief that guests who listen, turn to each other in disbelief. The sound of the main speakers have an ease and purity together with seemingly unlimited headroom, and listening to full symphony orchestras with a solid bass foundation is as close to the real thing as I have experienced. It's great to have your contributions on this forum.......it's just that you may not be right ALL of the time?