TC Electronic Thrust BQ500 bass head500 Watt Portable Bass Head with Mosfet Preamp and Thrust Compressor THRUST BQ500 is a 500 Watt revolution in portable bass amplification, packing more bang for the buck into an ultra lightweight micro bass head (2. 3 kg 5. 1 lbs) than a warehouse full of discounted fireworks! A custom designed EQ and MOSFET preamp provides a tremendous tonal palette and realistic tube like sound and feel. Built for the pragmatic bass player, the 500 Watt BQ500 is