Amplifier head for electric bass guitar from Tour series that delivers 450W RMS into 4 ohms and offers extensive tone shaping tools, such as bright and low-cut switches, active high and low shelving controls, a contour control for advanced signal shaping, and a 9-band graphic EQ with bypass switch configured to target critical bass frequencies. Thanks to the SmartRail technology, patented Peavey power-amp topology, it is possible for the combo to deliver its massive dynamic power with increased efficiency and lighter weight. The amplifier is also equipped with the Peavey-exclusive sub-harmonic generator with level control and foot switchable bypass that adds a note one octave lower than the original note, creating interesting harmonic textures and a significantly enriched bottom end. In addition, the XLR-equipped direct out allows traditional patching to a front-of-house or studio mixer, but features fail-safe phantom power backup that sends a flat signal through the house P.A. or studio console. Other features include pre- and post-gain controls, hi boost/low cut, post-EQ effects loop, buffered tuner send jack, two input jacks for high and low output bases and rear-mounted auxiliary input jack