Its a TRB-4, and I'm loving this thing. I actually bought it about 2 weeks ago, though I decided not to post about it without any pics. The bass has an ash body, 3 piece maple neck, and 2 band eq with a midrange boost selector switch. People who say these basses are no good for rock must be out of their minds. I'm able to get a serious mid-rangey jazz bass grind out of this bass, with almost stingray-like punchiness. I can also get a great assortment of more traditional "hi-fi" tones, great for jazz, funk, slapping, etc. As some have said though, the preamp does make some slight noise with the treble boosted, though this is really no problem for me as I don't think I'll be using it much. The neck and string spacing both feel and play perfectly, and the balance and ergonomics of the bass just fit like a glove. After getting pretty well sick of my cumbersome, neck heavy jazz bass, this bass has been a godsend to me, as I can now finally stop lamenting about the discomfort of playing my bass, and just get back to music. This ones definitely a keeper.