Dear Guido,
Yes, of course, Spectron has balanced output - its truly, not big deal.
Dear Zaikesman.
class D power module if anything its not IC chip and if they would be inexpensive then most if not all class D manufacturers would use them in FULLY balanced amplifier. It takes thousands and thousands of man-hours to design proper class D module. In the United States there are only three design studios (Spectron, Nu Force and that of Bruno Putzey)
I see that first of all we need to define word "balanced" - OK, balanced design of anything mean that there are two (2) signal paths in this "something" where all electrical characteristics are as identical as technically possible - with one exception only - they MUST be in oppose phase to each other.
For example, with flip of the switch on the back of Spectron you convert this stereo amplifier into FULLY (i.e. from amp input to binding posts of the speakers) balanced design with may be (nobody measured) 2400 wpc @ 8 ohms. You double slew rate, you double bandwidth, you have this and you have that. Simply the amp is so good that as far as I know nobody ever tried to use two of them in balanced monoblocks form.
The same is probably true (I suspect, I really don't know) with Jeff Rowland and other responsible and talented manufacturers in United States and Europe.
May be one day, I will write small "primer" on true advantages of fully balanced design, at least as can be implemented by end user in Spectron amps and post it on Discussion Form.
All The Best to both of you!