Focusrite ISA 428 MkII
Focusrite ISA 428 MkII 4-Channel Microphone Preamplifier
ISA 428 MkII incorporates four of Focusrite's renowned mic pres in a simple-to-operate 2U enclosure, placing four mic preamps, instrument inputs and line ins at your fingertips. The original Focusrite mic pre was designed to suit the microphones of the time; today's model makes one small change, adding three additional input impedances to the classic ISA 110 setting, allowing you to match any microphone, old or new, and access a wide range of sounds, from the character and warmth of a vintage mic to the clear transparency of a modern design.
Each mic pre has the option of mic, line or the front-panel instrument input, with variable input impedance to ensure you are getting the best performance from the source. Up to 60dB of gain is available on the four-position rotary and gain range switches, with a further +20dB of continuously variable trim, meaning a huge 80dB of gain is available should it be required. The high-pass filter features variable cut-off frequency between 16 and 420Hz. An array of 6-segment LED meters show peak signal level for the four mic pres, in addition to the four direct inputs to the optional A-D card. Switchable rear-panel insert points allow the use of inline processors such as compression.
- Classic ISA mic preamp design featuring Lundahl LL1538 input transformer
- Instrument and line inputs with dedicated input connectors and front-panel switch
- Switchable input impedance including classic ISA 110 setting
- Variable cut-off frequency high-pass filter
- Dedicated switchable insert point
- Per-channel six-segment LED peak-level meters
- Optional A-D card with up to 192kHz, 24-bit sampling via ADAT or AES3