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Focusrite ISA 828 MkII 8-Channel Rack-Mount Transformer-Based Microphone Preamplifier
The Focusrite ISA 828 MkII houses eight iconic transformer-based ISA 110-derived mic preamps in a compact 2U rack unit. Equipped with Lundahl LL1538 input transformers, variable impedance, front-panel instrument inputs, high-pass filters, optional digital expansion, and robust metering, this preamp delivers legendary tone with modern flexibility.
Key Features
- Iso Preamp Design: 8x classic ISA mic preamps with Lundahl LL1538 transformers
- Inputs: Mic/line inputs on all channels; front-panel instrument inputs on channels 1–4 with high/low impedance
- Gain: Up to 60 dB stepped + 20 dB trim (80 dB total) for mic gain; line gain –20 dB to +10 dB + 20 dB trim
- High-Pass Filter: Fixed 75 Hz, 18 dB/octave, per channel
- Metering: Per-channel six-segment LED meters with rear-panel calibration
- Input Impedance: Variable mic impedance—Low (600 Ω), ISA 110 (1.4 kΩ), Medium (2.4 kΩ), High (6.8 kΩ); instrument inputs switch between Low (470 kΩ) and High (2.4 MΩ)
- Insert Points: Switchable rear-panel inserts when used with optional AD card
- Optional A-D Expansion: Supports ISA ADN8 card for Dante, ADAT, AES3 outputs at up to 24-bit/192 kHz
- Power: Internal universal PSU (100–240 VAC), efficient switching design
- Reliability: Updated PSU generates less heat, higher reliability; 3-year warranty
Technical Specifications
- Dimensions: W 482 mm (18.98") x H 88 mm (3.46") x D 325 mm (12.80")
- Weight: 7.05 kg (15.55 lb) – 7.48 kg (16.49 lb) with accessories
- Gain Range (Mic): 0–60 dB stepped + 0–20 dB trim (80 dB total)
- High-Pass Filter: 75 Hz, 18 dB/oct, per channel
- Input Impedance Settings: Mic: 600 Ω / 1.4 kΩ / 2.4 kΩ / 6.8 kΩ; Instrument: 470 kΩ / 2.4 MΩ
- Metering: 6-segment LED, dBFS, rear-trim calibrated
- Power Consumption: 35 W
- Rack Space Required: 2U, with 75 mm rear clearance
- Max Env. Temp: 40 °C (104 °F)
What's Included
- 1x ISA 828 MkII unit
- 1x IEC mains power cable
- 1x Safety cut sheet / quick info
- 3-year Focusrite warranty
- Optional: ISA ADN8 A-D expansion card (sold separately)
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