I'm planning to install a fishman powerbridge on my Les Paul shortly - keeping it passive and really simple by wiring it to an on-off switch then straight to the ring of the stereo output jack. I'll be using an LR Baggs Para DI for all EQ and volume controls for the powerbridge, leaving the magnetic pickups and their controls/circuit completely unaffected. I've had one of these before, and if I recall I had issues with ground hum because the magnetic and piezo signals go to separate amps (I always assumed it was normal, if it isn't please let me know!!) - I used to get round it with a different preamp for the piezo that had a ground lift. Obviously the Baggs Para DI doesn't have a ground lift, and it requires phantom power, so I'm left looking at my options. I'm not completely up with what's safe and I don't want to take any risks. Would something like the Behringer MICROHD HD400 in front of the Para DI do the job? Has anyone used one for a similar purpose? Any help will be greatly appreciated! Many thanks, Ian.