Focusrite ISA 828 MkII Microphone Preamplifier

Focusrite ISA 828 MkII
The Focusrite ISA 828 MkII incorporates eight of Focusrite's classic mic preamps, with Lundahl LL1538 transformers on every input. Each channel has the option of mic or line inputs, while inputs 1-4 also feature instrument inputs on the front panel.

Focusrite ISA 828 MkII Microphone Preamplifier Details

The Focusrite ISA 828 MkII builds on the legacy of the original Focusrite Studio Console, incorporating eight classic mic preamps that share the simple yet powerful design of the ISA 110 module. Each input is equipped with a Lundahl LL1538 transformer, ensuring exceptional analogue character and sonic integrity.

Every channel of the Focusrite ISA 828 MkII offers the choice of mic or line input, with channels 1–4 also providing front-panel instrument inputs, making the unit highly versatile in a range of studio applications. The variable input impedance allows engineers to tailor the response to their microphones, including the authentic ISA 110 setting that reproduces the impedance of the original console design.

The Focusrite ISA 828 MkII provides up to 60dB of gain, along with an additional +20dB of continuously variable trim, giving a massive 80dB gain range. Each channel is equipped with a high-pass filter fixed at 75Hz with an 18dB per octave slope, perfect for reducing rumble and unwanted low-frequency noise.

Per-channel six-segment LED meters make accurate level monitoring simple, while switchable rear-panel insert points allow for the seamless integration of external processors such as compressors or equalisers.

Practicality is further enhanced with dedicated connectors for mic and line-level inputs, allowing all sources to remain connected simultaneously, making the Focusrite ISA 828 MkII an excellent choice for permanent rack installations. The new switching power supply provides efficient and reliable operation with reduced heat generation, ensuring stability in demanding studio environments.

For those requiring digital integration with the Focusrite ISA 828 MkII, the optional ISA ADN8 card offers eight channels of Dante, ADAT and AES3 connectivity at resolutions of up to 24-bit/192kHz, delivering pristine digital conversion alongside the legendary Focusrite analogue sound.

The Focusrite ISA 828 MkII combines classic analogue design with modern efficiency and flexibility, continuing Focusrite’s tradition of delivering professional-grade recording tools trusted worldwide. With a three-year warranty included, users can rely on long-term performance backed by Focusrite’s commitment to quality.

Features

  • Optional A-D card with up to 192kHz, 24-bit sampling offers high-quality digital audio conversion to Dante, ADAT and AES3Classic ISA mic preamp design featuring Lundahl LL1538 input transformer
  • Switching power supply design allows for efficient and cool operation
  • Front-panel instrument inputs to first four channels
  • Line inputs with dedicated input connectors and front-panel select switch
  • Switchable input impedance including classic ISA 110 setting
  • High-pass filter with fixed 75Hz frequency and 18dB/octave roll-off
  • Switchable insert points when used with A-D card
  • Per-channel six-segment LED peak-level meters
  • As with all Focusrite products, you’ll also benefit from a three-year warranty
  • Brainworx bx_console Focusrite – exclusive plug-in that faithfully captures the sound, feel and styling of the original Focusrite ISA 110 Equaliser and ISA 130 Dynamics Modules.

Specifications

Released in: 2017
Made in: China
  • Mic inputs gain range: 0dB to +30dB (30-60 switch disabled) and +30dB to +60dB (30-60 switch enabled) in 10dB steps, with an additional +20dB of continuous trim
  • Mic inputs impedance: Low = 600Ω, ISA 110 = 1400Ω, Medium = 2400Ω, High = 6800Ω
  • Mic inputs max input level: +7dBu, min gain, medium Z
  • Mic inputs frequency response (20Hz – 20kHz): 20Hz – 20kHz ±0.2dB, min gain, medium Z
  • Mic inputs THD + N: -91dB (0.0028%) @ -1dBr, min gain, medium Z
  • Mic inputs EIN: -123dBu ‘A’-Weighted (typical)
  • Mic inputs signal-to-noise ratio: 122dB ‘A’-Weighted (typical), medium Z
  • Mic inputs common-mode rejection ratio: 997Hz CMRR: -93dB, min gain, medium Z
  • Mic inputs phantom power: +48V, independently switchable per channel
  • Mic inputs high-pass filter: 75Hz knee frequency, 18dB/Octave, independently switchable per channel
  • Mic inputs frequency response (10Hz – 110kHz): 10Hz – 110kHz ±1.5dB, min gain, medium Z
  • Line inputs gain range: 20dB to +10dB in 10dB steps, with an additional +20dB of continuous trim
  • Line inputs impedance: Low = 600Ω, ISA 110 = 1400Ω, Medium = 2400Ω, High = 6800Ω
  • Line inputs max input level: +25dBu, min gain, low Z
  • Line inputs frequency response (20Hz – 20kHz): 20Hz – 20kHz ±0.1dB, min gain, low Z
  • Line inputs THD + N: -91dB (0.0028%) @ -1dBr, min gain, low Z
  • Line inputs signal-to-noise ratio: 122dB ‘A’-Weighted (typical), min gain, low Z
  • Line inputs frequency response (10Hz – 122kHz): 10Hz – 122kHz ±3dB, min gain, low Z
  • Instrument inputs gain range: +10dB to +40dB with continuous gain using trim pot
  • Digital card slot compatibility: ISA ADN8
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