MICROPHONE PREAmp Single channel DI / Preamplifier. ISA series transformer based preamplifier, mounted in a robust and portable chassis, and at a price never seen before. Versatile Independent DI Channel: Ideal for both the hobbyist and the serious user, Independent gain control, output to send to an amplifier, independent XLR output on the rear and connection to the optional A/D converter. You can switch between four carefully selected impedances, including that of the original ISA110. Headphone output with volume control for monitoring the sum of the two inputs, or an external stereo mix of the two inputs in TRS jack format on the rear panel. Dedicated insert point for additional processor, such as an equalizer or compressor. Optional 192 kHz stereo A/D converter, best-in-class A/D conversion with 118 dB dynamic range. The ISA One Digital model comes with the A/D converter as standard. Lundahl LL1538 input transformer used in the original Red modules. Backlit VU meter with variable calibration that guarantees a perfect adaptation with both analog and digital recording media. Inputs can be measured in both pre and post insertion mode.