Oh, I didn't know that.
I own two pairs of D7k and used Grace Design m903 when comparing them – it has two headphone outputs so I was able to swap between them and those were the effects I heard. Might be my ears sitting upside down though, lol. The pads went off as the bass became too prominent.
Here are a couple of shots from the session
Since you have experience with the older Denon model (built by Fostex and appearing to be the same basic chassis used as the TH series), how close is the sound to the TH900 (and I guess by extension the 600)? I have the D2000 w/ MarkL mods and looking at the TH900 it looks identical to mine other than wood cups.