There's not a dip, but I can shelve the treble down on the ribbon tweeters on my speakers by using wirewound resistors and I do lower the output of my tweeters so that the treble is less pronounced (I listen in a small room and I have to in order to get a balanced sound). Also in my opinion a lot of solid state amplification has "grit and grain" in the treble and I dislike that; I find my tube amplification to have a smoother and more tolerable treble. (I'm just not a solid state fan any longer after living with tubes for a decade; I've got a B&O system in the living room now that sounds pretty good--it ought to for what it cost the original owner, I inherited it recently--but I'd really rather have tubes, and I don't really listen to much music on it as my tubes sound more like music). The two lp burns that I have sound better than the Flip Conn to me on my system; the Conn sounds thinner and more digital. I really think that even if he is not using Nonoise, that the Sonic Solutions console imparts something to McMaster's work; I don't dig the sound. JVC's XRCD engineer has commented that he won't touch that console because it makes things sound immediately "digital". . . . I prefer RVGs because they don't sound as thin and brittle as McMasters. Sure there are some duds, but to me there are fewer duds and McMasters I find almost uniformly disappointing in their thinness.
I know it's just personal opinion after a point, but I just lately listened to someone else's system with a Denon receiver and some Heresys and I'm so glad to be back to my system! Man it was bright and gritty! The owner thought it sounded great. Ultimately it's mostly subjective. I'd rather have Addey and RVG remaster, but I'm not the producer.