D amps

@hgeifman FWIW, class D amps vary in sound more than tube amps seem to. So having a bad experience with one isn't an indication that another will be the same thing. The Hypex and Purifi modules are sold as parts so you have to come up with a power supply and input buffer, which has a dramatic effect on how they sound. At this point IMO its pretty well demonstrated that some of those modules have been put in boxes by by people that don't know what they are doing.

+1 @atmasphere 

@hgeifman May I know which specific vendor's Hypex-based amp you or your friends have purchased from?  Knowing the specific Hypex-based amp vendor might be necessary, as different vendors often implement subtle design choices that can influence sound quality beyond pure measurements. Brands like Apollon, Nord, and VTV Amplifier are some well-known names offering Hypex or Purifi modules, each with a slightly different approach to things like power supply and housing design, which can impact the listening experience.

@lanx0003. My first class D amp were custom built Hypex NCore NC400 bridged amplifiers. I had them for a short tine and replaced them with Mola Mola NC1200 mono blocks. I was disappointed with the sound quality and sold them. As I stated above, they sounded very good at first but the more I listened, the less I liked them.

This was several years ago and I have no other experience with class d amps.

I currently own the Musical Fidelity M-6Si integrated amp. I am VERY surprised it sounds this good. I am very happy with my decision. The M6si offers excellent performance, facilities, and power. As per the Musical Fidelity web site “Internally, the M6si is configured as 2 independent monobloc power amps with a separate preamp. It is, in fact, a preamp with 2 monobloc power amps that just happen to share the same casework. The M6si has 220wpc. It has very low distortion, outstanding noise ratio and extremely flat frequency response”.

+1 @atmasphere, I agree it is the overall design of the amp that makes it sound great.