Not surprised at that reviewer’s findings in regard to the Legacy i.V2 amp. Having worked with 2 vs. 4 channels of the i.V4 Ultra, I would not be without the two additonal channels for use with any speaker, from efficient to more difficult to drive. Big difference in perfomance with the extra two channels, which brings up the resolution and refinement without penalty. It’s such a large improvement that I would not even consider running only two channels on any setup when 4 are availalble. Why starve a system from the extra 600wpc? :)
My review of the i.V4 Ultra (in fact, I reviewed a pair of them, offering up to 8 channels of amplification, 4,800 total wpc into 8 Ohms - I put such things to good use) is at Dagogo.com, and I have to say that the Whisper with the Legacy XTREME XD Subs in such a setup (12 fifteen inch drivers altogether) is otherwordly in terms of dynamics. Scary capacity to pressurize the room even at low listening level. Some of the best sessions of detecting and appreciating LF in any system I have heard. That made the Focus seem like a bookshelf speaker in comparison.
Imo, putting another pair of speakers in for mains for HT would be a misstep. If I recall correctly, I used the Outlaw Audio’s (I don’t put big money into HT) pre outputs into the Wavelet for HT. Calibrate for level, and you’re set.