Sorry folks, I do not check these forums often so I am often late to comment....
If packaging tracking holds correct, a pair of the Atma-Sphere Class D amps will be here tomorrow (9/10). I will have them for several days before I need to send them off to their buyer, so I will get a chance to hear what they do on Merlin's.
In regards to TSM's . . .
Merlin TSMs between their sealed box alignment and crossover design, are a pretty stable easy load (min impedance is in the low 6 ohm range) and moderately efficient (87dB). So, many tube amps play really well with them. Many TSM users have Ars Sonum Filarmonia amps driving their TSMs (about 30W/ch) [I'll put in a plug here for the current generation of the Ars Sonum Filarmonia integrated amp, and its brother the Armonia power amplifier, which have a number of significant improvements over the earlier versions that Bobby P sold back in the aughts and early teens].
Of course good (smooth, clear - not overly damped) solid state works great on them too. For example, there are a number of Power Modules Belles Aria integrated amps being used on Merlin TSMs. Later version/production TSMs IMO can also really show off what even better solid sate amps can do.
I am very much looking forward to trying Ralph's new amps on the speakers. :-)
Cheers
Rich