2026 best deal in audiophile class D stereo amp?

@lardawg +1

The M700s make my Maggies sing. I’m delighted with the super quiet black background and tons of details. I can no longer chuck around 50# amps. The M700s are manageable weight wise and seem to be very well built. Around $2k used at The Music Room.

@gents, I know exactly what you mean.

How do the Hypex Nilai 500 amplifiers compare to other high performance amplifiers?

Within the category of high current capacity solid state amplifiers, it's generally true that the more expensive you go the better the audio experience, however, there are diminishing returns as you hit the extreme edge of price.
We have facilitated testing and listening to a variety of amplifiers, mostly Class AB. We have discovered that most amplifiers today sound pretty darn good. In our last amplifier shootout at Deer Creek Audio, we compared 7 amplifiers including the Nilai 500. The Nilai 500 measured better than all, however it came out second in the listening comparison to a $32,000 Ayre. What set the top two apart from the more common amplifiers was a smooth neutrality with superior imaging and layering.
Having said all that, we think going with the Nilai 500 will bring you happily into the ultra-high end amplifier world.

@kennyc so have you auditioned some of the other popular class D amps being suggested here?  (Class D audio, Buckeye, PS Audio, Laiv)  Or are you basing this on reviews?   The Atma-Shpere are very highly regarded and there is a used pair on audiomart... but there is also a Class D Audio GanFet 2 channel for a quarter the price.  I wonder if I could really hear the difference.  

I have received the provisional BOM for my custom design Class D Power Amp to be produced for me.

The BOM is not far from the cost of a cheaper option on a Quad of Power Amp Tubes I use, and near the cost of a respectable pair of SET Tubes I use.

Costs to be incurred will be any uplift in base costs as forecast in the BOM, the casing ( a friend just started out with a Audio Device Chassis / Case producing business has offered to produce my case), and a Labour cost, not yet supplied, but should be easy to forecast, as this will be the second model produced by the designer/builder. 

Off the shelf, might get a better price, but does not guarantee after-sales support.

In the UK, after 12 months, I would be on my own if having bought retail off the shelf. My audio equipment commission builds are designed/built by Audio EE's who I have cultivated friendships with since the 90's and 00's,  and I still have items produced today from their designs.

If I went down the retail route, I would be on my own with little support and close to £100K+ out of pocket to achieve an end sound I am able to create. 

My PS Audio PWT had very recently developed a fault, which I soon learned I was not supported by PSA. The PSA forum assisted with helping me get through the fault and produce a repair that is working. I haven't got that with Amplification built for me in the 90's, 00's and 20's.  

Reviews. I was curious about GanFet sonic differences until reviews did a comparison. I’ve demoed AGD and liked the Grand Vivace, the Audions were very good.

Other amp topographies also sound different, so I’m not surprised that Class D does also. Since the OP is moving from SET tube warmth, establish tube designers know deeply about tube sound when designing their non-tube amps. I’m assuming that the OP still wants that warmth.