Whirlwind invented the first commercially available DI box in 1979. Since then, the line has been expanded to included splitters, combiners, testers and various other specialty interface devices.

(Click here for the complete story of how Whirlwind began making the first high quality U.S. made DIs.)

Another batch of IMP2 DIs being assembled. Features include our own high quality transformer, heavy duty metal box and genuine Switchcraft connectors. In production over 20 years - the most relied on DI in history!

Every product from our IMP department is hand made with the finest quality components and is built to withstand the rigors of everyday professional use.