The output of the boss eq20 is +4 dbu. Am I correct in that this is enough output power to drive my AI Focus SA to its full 600w? If this thing works as a preamp, I would be quite pleased as it is light (2lbs) and talk about tone shaping (10 bands of eq with 9 presets). The only drawbacks are: 1. No DI 2. How to connect tuner? Could I use a "Y" cable from my bass (which has active EMG P pickups) to the input of the eq20 AND the input of the tuner without degrading the signal to a degree which would be noticeably negative? Thanks!