I might be able to help. I just set up a pair of Avantgarde Trios with Tact W210 subwoofers and a Tact 2.2 XP this weekend.
I have been using a Tact 2.2 for the past ~ 4 years, at first with Sonus Faber Guarneri's and REL Strata Subs, then with Tact W210 subs in place of the RELS< followe dby Kharm 3.2 CRM FE's in place of the Guarneri's. and now the Trios in place of the Kharma's. The W210'a are amplified byt a pair of Marantz MA700 monoblock (200 wpc), and my main speaker amps ar eCJ PRemier 8 XS (135 watts pure triode), though I am now auditioning the Lamm ML2's with the Trios. Beofre buying a tact, I used a top of the line BAT SE tube preamp.
I have not tried the 225 subs with the Trios. I have 2 pairs in the basement, but was told by the owner (these are on loan) that they wer enot all that good.
The integrations of the W210 subs and the Trios using the Tact 2.2 XP in my room (25 by 19 by 8.5 feet) is amazing. The W210's are not as loud as the Trios, but the Tact allows you to precisely mathc levles and tim-align the subs and the mains, so integration is seamless. The W210's are more thna fast enough for the Trios and,at $ 4400 a pair, one hell of a bragain vs any of the new Avantgarde Subs. I would ike to get another pair of W210's or a W410 in order to increase the output a fee dB..but as it is I get clean bass down to 20 Hz, and I'm down only 2 dB at 16 Hz.
One caveat...my Tact is heavily modified by Aberdeen Components - I have the so called "full enchilada" version, with a new power supplied, heavily modded D/A and A/d modules, and a heavily modded motherboard. This is NOT you grandfather's Tact! ONce ANthony Padilla gets done with the Tact, this thing rivals most outbaord DAcs and preamps. If you are considering a Tact, I wold NOT go with outboard DAC's..this will only introduce jitter and cost due to the additional interfaces and interconnects..and Anthony's modded DACs are VERY good....especialy wit the right trnasport (try his modded North Star 192..awesome for the $).
I listen to a lot of vinyl (Basis Debut Gold, Vector arm, Benz LP cartridge, Pass XOno preamp) and have no qualms abotu feeding it into the Tact A/D. It STILL sounds like vinyl, and it STILL beats the pants of CD..
I have no idea how your room measures, but in my experience abit of DSP correction and precise X-over settigns and delay setting will far outweigh any potential compromises introduced by the Tact. Again..I speak ONLY for the Aberdeen modifieds units. The stock Tact is good, but they dont use the highest quality components. When Anthony gets done with his upgrades, this thing is magic. Give him a call...he may even have a demo/trial unti to send you - he is a stand up guy..
I wont say the Tact is better than a top flight tubed preamp in aperfect room, but for what you are trying to do.I woud not go any other way...