While it will be "tested" thoroughly here, it has another home after I have played with it a bit. Ill elaborate on that more later in another post.
As to my personal opinion on the 400 from my experience. Intense quality amp. Simply crushed the Crown XLS. Not a comparison. Likely could have crushed the AP800 Yorkville pro amp as well. Standing up against the 1801, not so much. With that said, this is the only amp I have ever heard that has even come close to comparison with an 1801. Stacked against a stock 1801, that margin I believe was small. That little 400 was definitely the best competition its ever seen IMO.
While what I have come to expect from an 1801 was simply there with the 400at lower listening levels, at serious driving levels, for extended periods, the 400, could hold its own, but clearly couldnt keep up.
All things considered these are arguably one of the best amps you can get for your money in this day and age. Stand up quality. Without a doubt better than almost anything on the market in the price range.
After all my personal tests, I dont doubt that a 700, as Lee says, is "double the power" would possibly be able to trump my personal favorite.
Lee man, you made 2 serious audio nuts up in Canada extremely happy with that shit. We thank you kindly, from the bottom of our hearts brother.
Ben.