Hi All, This is my first post to the forum. Well, I just accepted delivery of my new J-RETRO 01 onboard preamp. It is a beauty, though much heavier than I had assumed it would be. Now, herein lies my dilemma: I had full intention of installing this baby in my passive Don Grosh J4, but over the past weekend, fell in love with and couldn't say no to a used Mike Lull M4V. Now I don't know if I want to "change" the Grosh, because I love the true passive tone she puts out. I've read that the J-Retro pre doesn't really put out a true passive tone, that the high and lows are somewhat colored. I will probably leave the Grosh original, remove the Bartolini 2 band pre in the Lull, and replace it with the J-Retro. Since they are both 2 band preamps, and I know the Bartolini is a proven piece of electronics so am I better off with one over the other? Your comments please.