Focusrite ISA 828 MkII

The Focusrite ISA 828 MKII is a versatile and flexible eight-channel microphone preamplifier in a 2U rack-mount design equipped with Lundahl input transformers and independent line and instrument inputs. The preamp topology is based on the circuitry of the original ISA110 designed by Rupert Neve, a circuitry that has been used for decades in Focusrite's most successful products.

The Lundahl LL1538 input transformer used in the original RED modules lends a special character to the sound that cannot be replicated in any other way. Another distinctive feature that will affect the sound of the connected microphone is the ability to select one of four carefully preset impedances (Low / ISA 110 / Med / High). This choice really does significantly affect the input sound, and you can experiment and bring out the character of the microphone or, conversely, opt for a completely transparent presentation, it's up to you. Within each channel, the preamplifier offers independent adjustment of all the important functions, starting with the impedance selection and precise gain adjustment via two potentiometers and a range knob, this combination makes the input gain as high as 80 dB. You'll also find switches for phantom power, phase rotation, insertion channels into the signal path and fixed HP filters.

In addition to the main microphone (8 x XLR) and line (8 x Jack 6.3 mm TRS) inputs on the rear panel, instrument inputs (4 x Jack 6.3 mm) are available on the front panel, so you can use the preamp's potential to enrich the sound of your instruments. A pair of DB25 terminals (A-D external inputs and Analogue outputs) are used to connect external devices (insert SEND/RETURN) and these inputs and outputs are activated by the front panel Insert buttons. If you only need an analog output, use the appropriate DB25 terminal to connect a multi-pair output cable. The preamplifier can be expanded with the optional ISA ADN8 card, which instructs high-end A/D signal conversion.