Ok, I want to out a new preamp in my Yamaha TRB6-P. The thing is, I can't decide which one. I have narrowed the selection down to either a bart NTMB or an aggie OBP-3. The thing I like about the aggie is the treble centre frequency is 6.5kHz, where as the bart's treble control is centred around 10kHz. I have heard that the bart treble control can be useless or very subtle, but i'm not sure I want subtle. The mid control I am happy with on either preamp, I only really want to control 800Hz. The bass control, not sure how different either would be. Some say the aggie has a fatter bass control, some say the bart is more natural sounding, and I don't know which one I want. I take it the 30Hz centre on the bart bass control isn't overly different to the aggie 40Hz centre? See, this is my problem, I'm looking at the figures, but I can't use my ears and try them both out. I could, but that would cost more $$$, and I live in Australia, meaning it costs even more. Does anyone have experience with both preamps? Just so you know, the bass has Lane Poors in it. Lucky me I guess. I am yet to be wowed.