My Larrivee LV-03RE came equipped with LR Baggs Element preamp installed. The output impedance as listed in the manual is 620 ohm which is Lo Z. Connecting cable is unbalanced. Do I need a Z matching transformer to match the 620 ohm output to 10 Meg ohm input on my Hi Z input acoustic/guitar amp? I must run volume level at high level when playing through an amp. Any suggestions?