Focusrite ISA 828 MkII – Eight-Channel Classic Mic Preamps with Modern Expansion
Built for high-end studios and enduring workflows, the ISA 828 MkII combines eight of Focusrite’s legendary transformer-based mic preamps with flexible analog/digital topology. Featuring adjustable impedance, instrument inputs, high-pass filters, and optional Dante/ADAT/AES3 outputs via expansion card, it delivers pristine sound, tonal richness, and pro-level adaptability—core gear for discerning setups at Soundium.
Key Features
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Eight ISA mic preamps with Lundahl LL1538 transformers: Vintage console tone with modern control, capturing presence, depth, and fidelity
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Multi-source input capability: Mic and line-level inputs on all channels plus front-panel instrument jacks on channels 1–4
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Wide gain range (up to 80 dB): Stepped mic gain (0–60 dB) plus continuous 20 dB trim delivers extreme flexibility
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Selectable input impedance & high-pass filter: Four impedance modes including classic ISA 110, and a built-in 75 Hz 18 dB/octave low-cut filter to tame rumble
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Per-channel metering & inserts: Six-segment LED meters, insert points for outboard gear, and calibrated level trimming for seamless integration
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Modern, efficient power design: Quiet, reliable switched-mode PSU reducing heat and enhancing durability
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Optional ADN8 expansion card: Adds ADAT, AES3 (DB-25), Dante audio-over-IP, and Word Clock I/O—up to 24-bit/192 kHz digital outputs
Customer Benefits
ISA 828 MkII delivers iconic analogue warmth and detailed capture in a single, rack-friendly unit. Whether you're tracking vocals, instruments, or expanding your I/O footprint, the adjustable impedance and instrument inputs offer creative tonal control. Smart metering and inserts let you shape sound with analog gear before conversion, and the optional digital card future-proofs your setup with network and digital audio workflows. It’s the refined heartbeat your studio deserves.
Quick Specs
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Analog Inputs: 8 × XLR mic/line, 4 × front-panel ¼″ instrument inputs
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Gain Range: Mic: 0–60 dB (stepped) + 20 dB trim (total 80 dB); Instrument: +10 to +40 dB via trim
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Input Impedance: Mic: Low / ISA 110 / Med / High; Instr (1–4): Low / High
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High-Pass Filter: 75 Hz, 18 dB/octave
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Metering: 6-segment LED per channel with rear-trim calibration
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Insert Points: Switchable per channel for analog processing
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Power: Universal IEC-switching PSU (100–240 V), approx. 35 W
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Digital Expansion (ADN8): ADAT, AES3 (DB-25), Dante (dual RJ-45), Word Clock in/out, up to 192 kHz
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Dimensions: 2U rackmount, about 7.05 kg
What’s in the Box
- ISA 828 MkII mic preamp rack unit
- IEC power cable
- Quick-start and safety documentation
Use Cases / Ideal For
Perfect for high-end studio tracking, live room capture, mobile recording rigs, and setups requiring both warmth and modern digital connectivity. Ideal as a front-end for converters, analog color extension, or I/O expansion via Dante or ADAT.
Compatibility
Uses analog outputs by default (DB-25), with inserts built for analog processing. Supports digital output when paired with ADN8 card—stream via Dante, ADAT, AES3. Clock sync via Word Clock I/O. Fits seamlessly into both analog and digital studio infrastructures.
Pros & Cons
✅ Pros:
- Iconic ISA tone with modern flexibility
- Massive gain range and adjustable impedance for tonal shaping
- Insert capability before digital conversion
- Optional digital expansion via Dante, ADAT, AES3 adds future-ready connectivity
⚠️ Cons:
- Analog only without ADN8—digital output requires separate purchase
- Large, heavy rack unit—not intended for mobile rigging without support
- Analog inserts and options add complexity to signal routing
The Focusrite ISA 828 MkII blends revered analog character with modern studio flexibility. Whether you're chasing classic mic tone or building a versatile, expandable ecosystem, it delivers unmatched sonic richness—available now at Soundium.
