A good friend uses the Citation 1 and 11 combo. The pre-amp really is something unique but what is of interest is we use both the 11 and the 1v. The four is a little simpler circuit but I tend to like the sound a little better; however the 11's have more power and really sock home the fundamentals. Nice hefty transformers. Have you read in AudioeXpress Norman Thagarrds article where he bridges either six or eight of these amps on each channel for a total of 600 watt output? He tells of having to brace the floor joists to support the weight of the whole group.