bel canto and wyred 4 sound

I would have to agree with Magfan on his comments regarding similarity of class D amps having more in like, than major differences. I have owned and tested a few and found this to be the case - WITH WHAT I HAVE HEARD.

There are certainly other threads that make note of MAJOR differences; however, not to my ear!

I am surprised how content I am with the Maggie SMGa speakers, considering their price (I paid), their age and the lack of equipment support vs. my main rig. It makes me want to consider buying a more current and much larger pair.

As to the sound of Bel Canto and W4S, I can't say based on side by side comparisons, but again, I agree with Magfan that there is unlikely to be much of a difference. So many of these Class D amps seem to be comparing themselves to much more expensive Class A amps. I haven't experienced a level of performance that is anywhere close to matching the true class A amps that I am accustomed to in MY SYSTEM.

I don't think you can compare the two brands. Wyred amps are mostly similar save power ratings however BC designs vary more. THe better BCs have improved power supplies and are tube pre-amp friendly. Different BCs use different version ICEPOWER modlues. The Wyreds are tube pre-amp friendly but do nothing special with teh power supply TTBOMK and I think all Wyreds use the same version of the ICEPOWER module. So you have to compare specif models, not brands in general.

Resale prices tend to be good relative indicators of how specific models compare feature wise I think

The ASP module includes powersupply. So, they are pretty much plug /play.

The ASC module is meant to be powered from an ASP module OR from a stand-alone PS. At that point you can buy a transformer and a capacitor bank, or go SMPS.

The output sections are very similar...topology and device selection.

It would appear that W4S uses unmodified ASP modules with perhaps a few changes on the input end. My PSAudio, built in the same facility has what they call the 'GainCell' on the input. I have no detail on that, except it is a potted module.

Other 'd' implementations may have character of their own. Hypex, Spectron and the little known International Rectifier are all 'd' entries. Spectron is proprietary, Channel Islands uses Hypex and I have no idea about IR modules, except I've got one out in the garage needing a power supply.

The 2 major topologies of 'd' amps, what are called 'FullBridge' and 'HalfBridge' may account for differences in sound.

Magfan, aside from adding an input buffer, I know for a fact W4S does modify their modules.

Would you or anyone consider such changes making the ASP moduled amps an Apples / Oranges proposition or maybe like a Fuji /Gala? (I'm a BIG fan of Apples!)

Changing (upgrade?) some caps? The only thing that would have a major effect, IMO, would be to change the feedback loop gain. I doubt even changing parts in the Zobel would have a major effect. The W4S integrated also has a different input impedance than the 'stock' ASP module OR my PSAudio which is a near-dead ringer. That supports your 'input buffer' remark.

I'd love to know what changes W4S makes. IF they are THAT major, why aren't they trumpeting it to the sky?

I'd LOVE it if someone organized a 'd' amp shootout. If it were local enough, I'd even bring my GCC250 over and put that in the rotation.