So I just ordered a 4 string pickup set for a jazz bass build I'm doing and I need some advice. The site says: "Contrary to common perception, due to the tri-colour coil mode LEDs, our Super-Quad pickups are completely passive. That is because our aim when designing the pickup was to achieve the 3 classic [passive] tones within a single housing. However, they are very effectively used with active preamps as well as passive circuitry." So any suggestions for a nice preamp? 2 band, 3 band. I had someone suggest the Aguilar OBP2 and OBP3. Sims website sells the Glockenklang 2 band and 3 band preamps. Thanks!