I have a Deckard on my desk as well. By itself it is a very smooth class A amp/DAC that is warmish and musical but I use the DAC and Deckard variable output to drive my Woo WA6 headphone amp. In this setup the results are fantastic as I can dial in the “pre-gain” and get the Woo amp to sing in the range it likes and sounds best. 
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Serge
Main System:
Amplification: Luxman L-590AX Mark II.
Luxman D-06u SACD.
Roon/Tidal.
Bryston BDP-Pi
PrimaLuna Dialogue HP EL34
Speakers: Harbeth 30.2 40th Anniversary
Headphones:
ZMF Auteur Blackwood, Audeze LCD-3, Audeze LCD-2C, Sennheiser HD600, HD650, Fostex TH-X00EB, E-MU Teak
Headphone Amplification: SPL Phonitor 2730, Audeze Deckard, PrimaLuna Dialogue HP, Luxman L-590AX Mark II, Woo Audio WA6
Source/DAC. Roon/Tidal.
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