Yamaha TRBX505 5 Strings Electric BassTRBX Electronics TRBX500 features controls for master volume, balance and 3 band EQ with active passive switch for maximum flexibility. Pickups YGD designed H5 pickups are defined by a clean, open tone thats perfectly matched with the flexibility of the active passive preamp design. Their quad polepiece design and alnico magnets give them the power to drive the active circuit and the sensitivity and subtlety to capture every nuance in passive mode.