I was talking with the luthier that made my bass(i bought it used) and he told that the pickups on that bass are similar to bartolinis, the thing that he modified on them is the higher output of 7000 ohm or something like that(the normal output is 4000 ohm aprox.) so this pickups are really heavy sounding because the old owner wanted a heavy sound(heavy but still has a natural sound, not distorted), so in order to produce that sound he used a wood called lingue on the body, that is a really full sounding wood with a lot of lows and lack of highs, and Eucaliptus on the fingerboard, wich is the same thing but with some high frequences. I think that the old owner used an external preamp to boost the high frequences....... but i can't remember that. anyway the trebly sound of the bass were in the frets...... when i converted it to fretless it sounded natural and huge but without highs.... that's why he told me to buy an active preamp, or modify the pickups..... now he told me that the bqc system is a really good preamp but i have my doubts...... opinions????? PD: I'm going to install it this saturday, so give your opinions quick. The homepage of my luthier is orrego.com, there are some pics of recent works. He is really well known where i live(Chile, south america).