How about a Yamaha AS 701 or AS 801 as an alternative? See here for a test of the previous AS 700, essentially the same amplifier but lacking the digital inputs: http://i.nextmedia.com.au/avhub/australian-hifi_reviews_2011-05_to_12_2011-07_yamaha_as-700_amplifie...
The test of the slightly less powerful AS 500 shows that also under simulated real loads frequency response is as flat as it gets (within +/- 0.05 dB), and better than almost all other amplifiers on the market, even very expensive ones. The implication is that this amplifier has no sonic signature at all - a straight wire with gain: http://i.nextmedia.com.au/avhub/australian-hifi_reviews_2014_2014-02_yamaha_as500_amplifier_review_a...
The test of the slightly less powerful AS 500 shows that also under simulated real loads frequency response is as flat as it gets (within +/- 0.05 dB), and better than almost all other amplifiers on the market, even very expensive ones. The implication is that this amplifier has no sonic signature at all - a straight wire with gain: http://i.nextmedia.com.au/avhub/australian-hifi_reviews_2014_2014-02_yamaha_as500_amplifier_review_a...