Thanks to Amir, recently I have ditched my enjoyable and lovely sounding, but very hot running (especially during summer), Quad feed-forward ‘current dumping’ 909 power amp (still have it though), and am now biamping my Neat Acoustics Notive 1 speakers, using all class D power amp combo:
a) Buckeye 2-ch amp, based on Purifi 1ET400A board (in high gain, driving tweeter and midrange)
b) Audiophonics, Hyped nCore NC502MP 2-ch based amp (driving bass woofers) … pre-amp is Benchmark LA-4, DAC is SMSL Su-9n
According to Dylan from Buckeye, in high gain mode Purify 1ET400A based amp, perfectly matched with the voltage gain of Audiophonics nCore NC502MP based amp … Buckeye + Audiophonics combo really sounds great … he is definitely right
literally unlimited clean power per channel (500+ watts) for less than 2.5 Grands