yea, it has a switch that allows you to add more upper mid-range and more top end. filter 1 starts at 3k and slopes upwards, and filter 2 starts at 1.5k and slopes upwards. i think filter 1 combined with the crossfeed is pretty magical. filter 1 starts just early enough to add a nice amount of attack to percussion(drums). it helps the snare drum in rock and metal to smack you in the face a bit which i really like and helps with vocal clarity, especially female vocals. it doesn't add enough treble to bring on any sibilance or harshness, but just enough to add some attack, sparkle and air to the mix.
it is pretty versatile. the only problem i could possibly see would be with somebody who likes crossfeed, but doesn't like the extra warmth and bass that it adds along with it. i really like the extra warmth and bass myself, and the brightness filters help even things back out a bit. i am loving the sound. it's very fun and engaging, but is still accurate enough and still very detailed. a person on the analytical side may find it a bit colored, but i enjoy it. i'd rather listen to the music than listen to the headphones. i prefer fun over analytical, but this is a good mix of both i think.
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yeah! im very exited about my future set up! i
do hear that the 650's are kinda dark, but to know that the amp can bring some brightness to them makes the deal even more sweet... sounds like it is a very dynamic and versatile amp... i can already see me spending hours a day during my vacations getting lost into my music, and "rediscover" a lot of my music! that's a testimony i hear often in these forums