Why do some fine solid state amplifiers like Soulution have such low input impedance?

I was looking at an excellent deal on a 5 series Soulution stereo amplifier to mate with my VAC Renaissance 5 preamplifier.  I then found out that the Soulution has an input impedance of 2000 Ohms balanced. Although my VAC is transformer coupled at the output, I am going to pass on the Soulution. Each component is too good alone to worry about a compromised “marriage”.  Do SS amplifier manufacturers find sonic benefit in such low input impedances, or is it really to discourage use with tube preamplifiers and encourage sales of their own preamplifiers?