Prasen
I also have an AKSA 55N( with Nirvana uograde) and find that this is very good. I have the standard Hypex unit.
So do you find AKSA just different or not as good as Hypex. I had read somewhere that the issue with Class D amplification which is also there with some extent with the hypex is higher output impedance even though the impedance is relatively quite uniform across the frequency range. So hypex is supposed to be good at the bottom extreme but not at the top extreme. You have the good fortune and by extension us too of having both to compare so please do elaborate.
Since we are on this topic have you heard of R.E designs. There LNPA 150 Mono amplifier (R.E. Designs LNPA 150 Monoblock Amplifier) are always well reviewed and the designer has this core design philosophy of targeting uniform charateristic across frequency range and power.