best speakers for wyred 4sound sti- 500

Chazzbo... yeah, all class D amps sound "dry" is like saying all tube amps are "romantic, noisy, and not very resolving," and that all conventional solid-state amps sound "bright." Also, the statement does not take into account that when you optimize a system for a particular amplifier it puts all other amp candidates at a disadvantage.

At any rate, the W4S STI-500 is an excellent, detailed and musical amplifier that can mate well with almost any speaker as it is very neutral and has great speaker control and drive capabilities. The Maggie 1.6 and the Emerald Physics 2.3 are valid candidates and there are many, many, more.

Rousosd I would suggest picking the speaker based on your room size, desired volume level, musical taste, and listening bias. Of course, as Chazzbo said, we have none of that information... To offer another analogy, it's like asking which fruit taste's better -- apples, oranges, blueberries, or watermelon?

Emerald Physics + Wyred 4 Sound is an excellent match, talk to Walter @ Underwood HiFi. Martin Logan/Magnepan also works well with class D.

I recently heard a pair of Acoustic Zen Crescendos hooked up to a W4S STI-500 and thought it was an excellent match.

Almost anything will work well. The world is your oyster....

I have the Red Dragon D amps and they have worked very well with Tannoy Ardens, Merlin TSMMMx, and Ref 3A Grand Veena.

Your amps should be able drive just about any speaker even the most high efficiency types.
My amps are dead silent, no buzzing or power noise thru the speakers, so even high efficiency speakers should be contemplated for the Wyred's also.