The Beta Ultra is the most versatile bass preamplifier we've designed: With its two distinct distortion circuits (Alpha and ), extremely high dynamic range, six-band active graphic EQ, dedicated headphone output and balanced direct output with switchable digital impulse-response cabinet emulation make for an incredibly complete tool for the modern bass player. Mod:Selects or mixes between the two distinct distortion circuits: A is punchy, tight with a lot of definition, whereas O is simply brutal and raw. On the Suite you can assign footswitch control of theMod to toggle between A and O. Blend:Mixes the clean and processed signals. The clean signal remains at gain while the volume of the overdriven signal is set by the Level knob, allowing for fine mix tuning.LevelSets the volume of the overdriven signal.DriveSets the amount of gain in the overdriven signal. Input Impedance: 500kΩ Output Impedance: 1kΩ Current Consumption: ~20mA DI out and ground lift controls 1/8inch aux-in and 1/8inch headphone out for silent practice Power Supply DC9V Volts ,center negative DC Current Draw 80mA Dimensions:12 x 9.5 x 5.5CM Weight : 473g Color: As Shown Material: Metal Package Contents: 1 * Bass Preamplifier Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.