Designed to help you integrate media players, iOS devices, and computer soundcards into your next gig, the Kopul SDI-APC3 is a stereo DI box with transformer-isolated inputs and active circuitry. With this device, you can feed the inputs of mixing consoles and recording interfaces with sound from low-level signals and HI-Z instruments alike, all while preserving tonal integrity across long cable runs.
On the input side of the SDI-APC3, you’ll find two 1/4" TS jacks. These are suitable for instruments such as electric guitars, basses, and keyboards. You'll also find a single stereo 3.5mm input for smartphones, tablets, and media players. Rounding out the input section are two RCA jacks for turntables, A/V connections, computer soundcards, and more. The output section provides two XLR connectors, as well as two RCA through-outputs for routing sound to additional consumer-level gear.
Operating on the 48V phantom power provided by your console or interface, the SDI-APC3 provides active circuitry that converts high-impedance, unbalanced signal into audio compatible with balanced, mic-level inputs. This active circuitry, coupled with isolated 1.1 transformers on each input, serves to mitigate noise issues often associated with long cable runs. It also helps preserve the integrity of low-level signals, all while preventing ground loops.
You’ll note the -15 dB pad for lowering particularly hot levels, as well as a ground-lift shift, should you encounter a ground loop. Its sturdy aluminum housing not only provides durability, but electrical isolation. This bolsters signal integrity even further.