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Focusrite ISA 828 Microphone Preamp

8-Channel Microphone Preamp with A-D Conversion
Part No: MOIF828MK2-UK

The ISA828 eight-channel microphone preamplifier provides eight original ISA transformer-based preamps in a single robust 2U chassis, offering the Focusrite signature sound at its lowest cost per channel to date. The eight ISA-series transformer-based microphone preamps feature the same classic microphone preamplifier design as the original ISA110 module from Focusrite's critically acclaimed Forté console (including the original Lundahl L1538 transformer and bespoke zobel network).

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£1,949.00 £1,624.17 ex VAT
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£1,949.00 £1,624.17 ex VAT

 
Focusrite

Product Description

Details

Focusrite’s ISA828 eight-channel microphone preamplifier delivers the Focusrite trademark sound at its lowest cost per channel to date, supplying eight original ISA transformer-based preamps in a single sturdy two unit chassis. The eight ISA-series transformer-based microphone preamps make use of the same archetypal microphone preamplifier design as the original ISA110 module from Focusrite's legendary Forté console (including the original Lundahl L1538 transformer and bespoke zobel network).

The preamps are supplemented by eight line inputs, eight line outputs and a further optional eight channel 192kHz A-D converter boasting a dynamic range of 122dB. The ISA828 also combines speedily and effortlessly with ProTools HD, and other popular hard disc recorders and mixing desks, because of its widely-compatible 25 pin D-Type connectors.

The microphone input stage also features a variable impedance circuit, providing the user the opportunity to alternate between four well thought out selected input impedance settings. The original ISA110 setting is complimented by three more impedance settings to either faultlessly counterbalance the preamp with a microphone, maximising level, or to use diverse settings creatively to sculpt the sound of the microphone being used.

High and low impedance options are present on the four front panel instrument inputs to deliver a complete and accessible DI solution. If the need arises to position extra processing between the preamp and converter insert switches feature on every channel. Each channel provides vintage design 75 Hz / 18dB per octave high pass filters, making certain that unwelcome low frequencies are essentially eliminated.

Features

  • Eight ISA series transformer-based preamps: in a single robust 2U chassis, offering the classic Focusrite pre at its lowest cost-per-channel to date

 

  • New optional eight-channel 192kHz A-D converter: Embodies cutting-edge conversion technology, incorporating Focusrite analogue circuitry to deliver the best A-D performance on the market, bar none

 

  • Convenient 25 pin D-type connectors: The ISA828 integrates quickly and seamlessly with ProTools HD, as well as other popular hard disk recorders and mixing desks

 

  • Switchable impedance: Selectable per channel; choose one of four carefully selected input impedances, including the original ISA110 setting, to suit any microphone

 

  • Direct instrument inputs: Each instrument input features high and low impedance options to provide a comprehensive and accessible DI solution

 

  • Inserting available on every channel: Allows external devices to be inserted between the preamp and the A-D converter, using the 25-pin D-type cable
 
  • High pass filter, phase reverse and phantom power: Each has a dedicated switch, independent on each channel
 
  •  Six LED input meter: Complete with precise meter trim - Designed to utilise the same reference points as Avid Pro Tools HD™

Specifications

Additional Information

Specification

Mic Input Response

 

  • Gain range: 0dB to 60dB in 10dB steps
  • Input Impedance, variable: 600?, 1k4?, 2k4?, 6k8?
  • EIN (equivalent input noise): -126dB measured at 60dB of gain with 150 Ohm terminating impedance and 22Hz/22kHz bandpass filter
  • Noise at main output with gain at unity (0dB): -97dBu measured with a 22Hz/22kHz bandpass filter
  • Signal to noise ratio relative to max headroom (9dBu): 106dB
  • THD at medium gain (30dB): 0.0008% measured with a 1kHz -20dBu input signal and with a 22Hz/22kHz bandpass filter
  • Frequency response at minimum gain (0dB): -0.5dB down at 10Hz and –3dB down at 110kHz
  • Frequency response at maximum gain (60dB): –3dB down at 16Hz and –3dB down 85kHz
  • CMRR: 91.8dB (Channel 1, 1kHz, maxiumum gain)
  • Crosstalk Channel to Channel: with 10dB@1kHz input to chA, chB output =102dBrA. With 10dB@10kHz input to chA, chB output = 84dBrA


Line Input Response

 

  • Gain range: -20dB to +10dB in 10dB steps
  • Input Impedance: 10k? from 10Hz to 200kHz
  • Noise at main output with gain at unity (0dB): -96dBu measured with a 22Hz/22kHz bandpass filter
  • Signal to noise ratio relative to max headroom (24dBu): 120dB
  • Signal to noise ratio relative to 0dBFS(+22dBu): 118dB
  • THD at unity gain (0dB): 0.001% measured with a 0dBu input signal and with a 22Hz/22kHz bandpass filter
  • Frequency Response at unity gain (0dB): 0.3dB down at 10Hz and –3dB down at 122kHz


Instrument Input Response

 

  • Gain range: 10dB to 40dB continuously variable
  • Input Impedance: 1M? or 300k?
  • Noise at minimum gain (+10dB): -90dBu measured with a 22Hz/22kHz bandpass filter
  • Noise at maximum gain (+40dB): -62dBu measured with a 22Hz/22kHz bandpass filter
  • THD at minimum gain (+10dB): 0.002% measured with a 10dBu input signal and with a 22Hz/22kHz bandpass filter
  • Frequency Response at 10dB gain with -10dB input: 10Hz-200kHz +/- 0.6dB
  • Frequency Response at 40dB gain with -40dB input: -2.5dB down at 10Hz and 0dB at 200kHz


High Pass Filter

 

  • Roll off: 18dB per octave 3 pole filter
  • Fixed Frequency 75Hz measured at the 3dB down point


Dimensions and Weight

  • 484mm (W) x 85mm (H) x 305mm (D) (350mm depth with heat sink)
  • Weight: 8.84kg

 

Download ISA 828 User Manual

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