Focusrite ISA 428 MkII 4-Channel Rack-Mount Transformer-Based Microphone Preamplifier
Focusrite | SKU: FOCUSRT-ISA428MKII-AMSISA428MK2
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Most orders placed before 10:00am PST will most likely ship out the same day. We work hard to process and ship your items quickly so you can start enjoying them as soon as possible.
Found a lower price? Contact us and we'll see if we can match it! Price match will only be applied to products sold and shipped by authorized retailers of the brand.
No restocking fee will be charged when you opt for store credit. Exclusions apply.
Condition: New
AMS-ISA428MK2
Focusrite ISA 428 MkII 4-Channel Rack-Mount Transformer-Based Microphone Preamplifier
The Focusrite ISA 428 MkII houses four acclaimed transformer-based ISA mic preamps in a compact 2U rack enclosure. With selectable input impedance, front-panel instrument inputs, insert points, LED metering, and optional onboard A-D conversion, it offers both classic sonic character and modern flexibility.
Each channel delivers up to 60 dB of stepped gain plus an additional 20 dB trim (80 dB total), a variable high-pass filter (16ā420 Hz), and transformer-driven warmth. Add the optional A-D conversion card to integrate eight analog inputs with high-quality digital output.
Key Features
- Mic Preamps: 4 transformer-based ISA series mic pres with Lundahl LL1538 transformers
- Gain Range: 0ā60 dB stepped, plus 0ā20 dB continuous trim (80 dB max)
- Input Types: Mic (XLR), Line (TRS), front-panel Instrument (Ā¼ā³ TS)
- Input Impedance: Selectable: Low (600 Ī©), ISA 110 (ā¼400 Ī©), Medium (2.4 kĪ©), High (6.8 kĪ©)
- High-Pass Filter: 18 dB/octave, 16ā420 Hz (continuously variable)
- Inserts: Switchable per channel for outboard processing
- Metering: 6-segment LED peak meters per channel
- Optional A-D Conversion: Internal 8-channel AD card (ADAT/AES3, up to 192 kHz, 122 dB dynamic range)
- Connectivity & Power: IEC mains (100ā240 V), rear-panel I/O including mic/line inputs, inserts, outputs; sealed 2U rack unit requiring 75 mm rear clearance
- Warranty: 3-year manufacturer warranty (as with other ISA products)
Technical Specifications
- Dimensions: 19" W Ć 3.5" H Ć 11" D (480 Ć 88 Ć 280 mm)
- Weight: 12.2 lb (5.5 kg)
- Package Weight: 15.5 lb (7.03 kg)
- Box Dimensions: 25" Ć 18" Ć 9"
- Gain (Mic): Up to 80 dB total
- HP Filter: 16ā420 Hz, 18 dB/octave
- Impedance Settings: 600 Ī©, 400 Ī©, 2.4 kĪ©, 6.8 kĪ©
- Metering: 6-segment LED
What's Included
- 1x ISA 428 MkII unit
- 1x IEC power cable
- 1x User manual
- 3-year warranty
- Optional: A-D conversion card (sold separately)
