New Class D amplifiers

I suggest checking out the D-Sonic M3a-800S. This will give you 400 wpc or 2x the max rating of your speaker.

I have their M3a-600M mono-blocks, which at 600 wpc provide 2x the max rating of my ATC Scm-19's. The headroom and high dampening factor provide great control over the speakers, even at lower listening levels.

You might want to consider the Lyngdorf SDA 2400.

There are also plenty other like NAD, Bel Canto or Mola Mola.

From my experience Class D is very neutral, can sound brilliant with a good source from the preamplifier, or be unforgiving with a poor signal.

it’s - as always - a matter of matching.

My Peachtree GaN 400 @ $2500 is easily the bargain of the year. I'm a tube lover and matched it with Audio GD tube preamp. Beautiful , silky smooth sound and power to drive any speaker. I'm sold on good quality ganfet transistor amps. Sounds like class AB without the heat.

@innersound300  Gene of Audioholics is not someone I would rely on for audio advice. He’s a notorious cable denier, who when challenged to back up his claims predictably seeks out the nearest rock to hide under. 

@grantgg I would also look at Orchard Audio and VTV, both designers have made huge strides in implementing GaNFET technology. Both have received glowing reviews.

I have a pair of Atma Sphere mono blocks (Class D) on order, which should arrive mid March. So I can’t yet comment on their sound but after countless hours of research they appear to be the best Class D amps I could find under $5K.  

Happy listening. 

Check out Buckeye amps.