High end Class D amps?

 'naturally balanced'.

This statement is not correct!
And as far as Laverda's go your lucky to keep your fillings in your teeth after a ride.

Moto Guzzi's  feel very similar to the BMW horizontal flat twin vibrations, both are no-where near as smooth as he V Twin Ducati.
 

Ducatis and Moto Guzzi as you know share the same top end angles between their cylinders so vibration harmonically cancels; i.e. 'naturally balanced'.

This statement is not correct either. Ducati's V-twins are perfect balanced because of the counter weighting that can be done (my mistake saying they were "naturally balanced")

Ducati:
The first thing is that Ducati V twins have or 90 degrees. This uniquely makes it possible to balance a 90-degree twin with counterweights of 100 percent of one piston's shaking force.

Moto Guzzi: 
"There are two aspects to our Moto Guzzi engines. One is that they are "fairly" vibration free compare to some other twins (like HD and old British twins) but "they still have secondary vibrations". But that is also separate from the side to side torqueing vibration of the motor that is more noticeable when you get on or off the gas but is always there." "Guzzi parts are not well balanced and the transverse layout also contributes...the late, great Gordon Jennings felt that transverse engines seem to vibrate more.."

You want to talk smooth motorcycles? My 1996 Yamaha Royal Star Classic Cruiser (purchased new out the crate)  is 4 cylinder

Moto Guzzi's feel very similar to the BMW horizontal flat twin vibrations, both are no-where near as smooth as he V Twin Ducati.
 

For along time the 916 was my dream bike. Then a friend let me ride it and I never wanted to ride one again. It vibrated more than my Guzzi, the seat was hot and I nearly threw the thing on the ground trying to turn into an entrance ramp at slow speed; I was unprepared for its limited turn radius.


Actually you can get the Laverdas to be quite smooth (but not as smooth as a 90 degree or 180 degree twin). The trick on the triples is a computer controlled timing advance. It also helps to weight the ends of the handlebars. With the twins they are actually well-behaved on account of the pistons being 180 degrees apart when firing, and a well-weighted flywheel. Despite all that, they hold up extremely well.

Michael Fremer says it drives the Wilson’s very well? I have not read the review yet. OH NO, this cannot be. George will never talk to us again.

You believe Fremer on any PS audio product? good luck with that

I see a slight problem in Michael Fremer’s review of the PSA amps...he and Paul McGowan happen to be very good friends...so..for reality’s sake...I would take that review with a grain of salt.

You can say that again.

JA bench tests found this PS Audio amp’s distortion rises very quickly into 2ohms, about 3 x higher even only at 1/3rd it’s output power, would be nice to see what the distortion would be then with the Alexia’s 0.9ohm!!!

And as for wattage power tests into 8 and 4ohms yes it does well, just like any Class-D, but JA didn’t post up any test or mention into 2ohms, and you can only guess why, as he nearly always does with linear amps.

JA
Like he did with the smaller A-Class Gryphon Essence poweramp
8ohms 53w (all in Class-A)
4ohms 101w (said to be all Class-A as well)
2ohms 182w

Cheers George

Also the linear Soulution Amp
135W into 8 ohms
260W into 4 ohms 
490W into 2 ohms 

Not many Class-D's have I seen JA do 2ohm loading wattage figures on, in fact can't remember any.

Cheers George