V-TONE BASS DRIVER DI BDI21 The BDI21 combines the features of an active DI (direct injection) box with our proprietary tube emulation circuitry. It’s like having a truckload of vintage tube amps right at your toes! The Blend control allows you to mix the amount of tube emulation you want with your direct bass signal. And if you just want your instruments straight, pure tone – just step on the switch and the  ADI21  functions as a superb active DI box. You’ve Got Control With its dedicated Drive, Treble, Bass, Level, and Presence dials, the BDI21 goes above and beyond the call of duty, giving you vintage tube tones for funked-up slap, gonzo overdrive and everything in-between. You can use the BDI21 as a recording output DI with tube emulation, or as a standard active DI box, when running in bypass mode. The output is presented in ¼ " TS or balanced, gold-plated XLR connectors. There's also a ground lift switch that eliminates typical ground loop hum problems. You can power this bad boy with a 9V battery or our  PSU-SB  DC power supply (not included). Sound Value Thanks to our revolutionary Class-D amplifier technology, we are able to provide you with enormous power and incredible sonic performance in an easy-to-use, ultra-portable and lightweight package. Class-D amplification makes all the difference, offering the ultimate in energy efficiency and eliminating the need for heavy power supplies and massive heat sinks. This amazing technology makes it possible to design a