What makes a Devialet unique and standing out from any competition is its patenting amplification section ADH (Class A / Class D Hybrid). What you get to hear is the purity of a class A together with the efficiency of a class D. This allows us to have the best of both world.
Secondly, there is a DAC which is an integral part of the amplifier's circuitry and makes it difficult not to use.
Those 2 stages together give us such incredible characteristics such as less than 0.001% THD and less than 0.001 Ohm of output impedance. This alone gives you a damping factor between 6000 and 10000 which is HUGE! That means that the Devialet really holds the speaker. This results in a very precise sound stage and extremely well defined basses.
You can use a Devialet (using the PreOut) to feed another amp or active speakers; but it is a little bit like owning a Ferrari and just drive with the first gear!