Focusrite ISA 428 MKII
Professional music gear - detailed information and where to buy
The ISA 428 MKII is a serious preamp for engineers and musicians chasing that classic, analog warmth. Its transformer design adds a lovely harmonic richness to vocals, acoustic instruments, and even electric guitars. This is a workhorse for anyone needing high-quality, reliable preamps for tracking and mixing.
Product Description
- Focusrite ISA 428 MKII
- 4-Channel preamplifier
- For microphone - instrument Hi-Z and line signals (transformer-based)
- 4 Line outputs
- Variable input impedance
- Per channel: phantom power
- insert
- phase reverse and variable high-pass filter (16 - 420 Hz)
- 6-Segment LED display
- Optionally upgradeable with: 24 bit 192 kHz 8-channel AD converter card
- Dimensions: 19"/ 2U
PROS
- • Transformer-based circuitry imparts a warm, characterful sonic signature.
- • Variable input impedance allows tailoring preamp response to diverse sources.
- • Robust, rack-mountable build quality inspires confidence and longevity.
- • Flexible routing options with inserts and phase reverse enhance workflow.
CONS
- • Premium-priced, a significant investment for smaller studios.
- • Limited channel count might not suit large-scale recording projects.
- • Can introduce subtle noise floor in very quiet recording environments.
Product Video
Key Features
Channels
4
Preamp Type
Transformer-based, Class A
Gain Range
+60 dB
Phantom Power
48V
Connections
4 XLR/TRS combo inputs, 4 TRS line outputs, Insert sends/returns
Weight
7.7 lbs
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Frequently Asked Questions
Unlike many Focusrite models, the ISA 428 MKII’s transformers provide a distinct, more saturated and 'vintage' tone – less clean, more characterful.
It's genuinely useful; adjusting impedance can significantly alter the low-end response of dynamic microphones and instruments, improving tracking.
The optional AD converter provides a clean, high-resolution conversion path, but its value depends on your existing ADC chain - it’s an upgrade, but not a night-and-day difference.
