D400 to 440 Pro SQ reviews

[Amelot75]

My 440-Pro CI returned from France Friday morning after upgrading from 400 & they've been playing continuously for the last 40 hours. After the initial 36 hrs of continuous pink / white noises burnin', I sat down to do some serious auditioning. Here's what are my observations ...

The first thing that strikes you is the huge dynamic ability of the amps along with clarity. Upon dissecting this, the Low-level details especially the high frequency harmonics, reverberant cues in the music and other small textural and transient details became much more audible, intelligible and coherent so much so that you begin to rediscover your music once again ... along with the exploding dynamic behaviour of the dual-mono amplifiers that brings forth new realm of holographic, three-dimentional sound to your room. 

I used AIR with my Macbook Air playing files straight from Roon to the 440-Pro CI using Audioquest Diamond Ethernet. The new CI board is apparently doing a ton of good things yet the same earlier DAC chips of the 400 is still present ... it does make me wonder that Devialet has done a marvellous job whatever they did on the CI board. The streaming was flawless using FW 13.0.0 + DOS 2.2.2. 

This upgrade from 400 to 440-Pro CI was worth every bit of my money and my sincere thanks to @Confused for advising me to go ahead with it. I am really glad I did it and IMHO, the direct streaming to the Devialets is absolutely flawless [so far]. 

My next plans are to replace my Macbook Air with a Roon Nucleus with internal SSD, a Linear power-supply that I built myself and also address power conditioning by incorporating a PS Audio Direct Stream Power Regenerator 12.

Thank you for your wonderful SQ feedback.