Focusrite ISA 428 MkII
4-channel Mic Preamp
Preamp$2,300Manufacturer list price
Specifications
- Type
- Preamp
- Description
- 4-channel Mic Preamp
- Topology
- solid-state, based on original ISA 110 module design
- Signal path
- Analog
- Channels
- 4
- Channel format
- 4 mic preamps with variable impedance, 4 instrument inputs, 4 line inputs; 4 XLR line outputs, 4 inserts
- Form factor
- Rackmount
- Rack units
- 2U
- DSP
- false
- Powered
- true (mains, 100-240V IEC)
- Frequency response
- -0.35dB@20Hz to -3dB@122kHz (0dB gain)
- Impedance (Ω)
- 600 / 1400 / 2400 / 6800 (switchable input impedance)
- Introduced
- 2020
Details
Controls: Gain (0-60dB in 10dB steps + 0-20dB continuous trim), variable HPF (16-420Hz), 6-LED per-channel metering, variable input impedance (600/1400/2400/6800Ω)
I/O: 4x XLR mic in, 4x front instrument in, 4x rear line in, 4x XLR line out, 4x TRS inserts; optional 8ch ISA ADN8 A-D card for Dante/ADAT/AES3 output
Notes: Site listed unit as out of stock at time of check (7/2026); price_usd is last published MSRP, FLAGGED. year_intro of 2020 FLAGGED as inferred from the same-generation ISA 828 MkII/ADN2/ADN8 announcement (Jan 2020); no separate 428 MkII launch date found. Phantom power not explicitly stated on page, left blank.