Quite the thread folks!!
Not to add any fuel to this fire, I would like to say that I have heard both the NAD & Amplifier-Dudes amps and they are not even on the same planet. Atmasphere is 100% correct about the input buffer/gain stage which is where most companies try to save money but AD has put most of his, and this is why there are some products that can benefit from modifications, and some that don't need them at all. Personally, I want to have a completely clean and neutral amplifier (to my ears) with a high SINAD to start the system, and build any flavour or character down stream, I believe that unless you start off that way you will always end up chasing your tail sonically. I also think that Bruno has done a lot to help the average audiophile with the cost/reward ratio that these modules can provide and thus allowing more funds to go towards speakers/drivers, in particular because with amps being so inexpensive, relatively speaking?? one can now think about active for a reasonable cost which intern allows for better drivers with lower distortion which ultimately ends up creating a more complete illusion with blacker blacks etc. This is the route that i'm choosing, and for me thus far it has been very satisfying. Everyone else's journey will differ, good luck with it as it's your system and your ears, i've not yet heard the LSA but will report back if I do as I've heard most of the class D options available, my amp journey, at least has ended.
Cheers,
