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  Focusrite ISA828 8-Channel Mic Preamp

Focusrite ISA828
Focusrite ISA828
 
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List Price: $3,124.99
Our Price: $2,499.99


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Product Code: 9999-01765

8-Channel A/D Option

  

 
 

Focusrite ISA828 8-Channel Mic Preamp

Focusrite ISA828 8-Channel Mic Preamp

Focusrite ISA828 8-Channel Mic Preamp Details

The ISA828 eight channel microphone pre-amplifier provides eight original ISA transformer-based pre amps 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 pre amps feature the same classic microphone pre-amplifier design as the original ISA110 module from Focusrite's critically acclaimed Forte console (including the original Lundahl L1538 transformer and bespoke zobel network).

The pre-amps are complemented by eight line inputs, eight line outputs and an optional eight channel 192kHz ADC boasting the widest dynamic range of any converter to date. Thanks to its convenient 25 pin D-Type connectors, the ISA828 also integrates quickly and seamlessly with ProTools HD, as well as other popular hard disc recorders and mixing desks.

The microphone input stage additionally includes a variable impedance circuit, allowing the user to switch between four carefully selected input impedance settings. The original ISA110 setting is supplemented by three further impedance settings to either perfectly match the pre-amp with any microphone, thus maximizing level, or to use different settings creatively to shape the sound of the microphone being used.

The four front panel instrument inputs also feature high and low impedance options to provide a comprehensive and accessible DI solution. Insert switches are also featured on every channel, should the need arise to place extra processing between the pre amp and converter. Vintage design 75 Hz / 18dB per octave high pass filters are also provided on every channel, ensuring unwanted low frequencies are effectively eliminated.

The ISA828"?s optional eight-channel 192kHz ADC is the first audio ADC to utilize Texas Instruments' Burr-Brown Pro Audio Amplifiers and Flagship Analog to Digital Converter PCM4220 chips. This cutting-edge technology is encompassed within Focusrite"?s own custom analogue circuitry to provide eight channels of unparalleled A/D conversion, delivering a dynamic range of 122dB and jitter at less than 250 picoseconds.

Finally, every channel features a six LED input meter, complete with global precise meter trim. Metering has been designed to utilise the same reference points as Digidesign"?s Pro Tools HD" system and provides clear and accurate input metering, independent of the DAW.

Focusrite ISA828 8-Channel Mic Preamp 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
  • Optional eight-channel 192kHz A-D converter
    • The Focusrite ISA 8-Channel A/D Option embodies cutting edge conversion technology, incorporating Focusrite analogue circuitry to deliver the best A-D performance on the market, bar none
  • Interface easily with Pro Tools and other systems
    • With convenient 25-pin D-type connectors, ISA 828 integrates quickly and seamlessly with Pro Tools | HD, as well as other popular hard disk recorders and mixing systems
  • 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
  • Switchable impedance
    • Selectable per channel; choose one of four carefully selected input impedances, including the original ISA110 setting, to suit any microphones
  • High pass filter, polarity 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 Pro Tools | HD
  • Eight Lundahl LL1538 mic input transformers
    • The original mic transformer used in the original Red modules helps to provide the unique sound and performance of this groundbreaking design

Focusrite ISA828 8-Channel Mic Preamp Specifications

  • Mic Inputs
    • Gain range
      • 0 dB to 60 dB in 10 dB steps
    • Input Impedance
      • Variable, 600Ω, 1k4Ω, 2k4Ω, 6k8Ω
    • EIN (equivalent input noise)
      • -126 dB measured at 60 dB of gain with 150 Ohm terminating impedance and 22 Hz / 22 kHz bandpass filter
    • Noise at main output with gain at unity (0 dB)
      • -97 dBu measured with a 22 Hz / 22 kHz bandpass filter
    • Signal to noise ratio relative to max headroom (9dBu)
      • 106 dB
    • THD at medium gain (30dB)
      • 0.0008% measured with a 1 kHz -20 dBu input signal and with a 22 Hz / 22 kHz bandpass filter
    • Frequency response at minimum gain (0 dB)
      • -0.5 dB down at 10 Hz and ""3 dB down at 110kHz
    • Frequency response at maximum gain (60 dB)
      • ""3 dB down at 16 Hz and ""3 dB down 85 kHz
    • CMRR
      • 91.8 dB (Channel 1, 1 kHz, maxiumum gain)
    • Crosstalk Channel to Channel
      • With 10 dB @ 1 kHz input to chA, chB output = 102 dBrA. With 10 dB @ 10 kHz input to chA, chB output = 84 dBrA
  • Line Inputs
    • Gain range
      • -20 dB to +10 dB in 10 dB steps
    • Input Impedance
      • 10 kΩ from 10 Hz to 200 kHz
    • Noise at main output with gain at unity (0 dB)
      • -96 dBu measured with a 22 Hz / 22 kHz bandpass filter
    • Signal to noise ratio relative to max headroom (24 dBu)
      • 120 dB
    • Signal to noise ratio relative to 0dBFS(+22dBu)
      • 118dB
    • THD at unity gain (0dB)
      • 0.001% measured with a 0 dBu input signal and with a 22 Hz / 22 kHz bandpass filter
    • Frequency Response at unity gain (0dB)
      • 0.3 dB down at 10 Hz and ""3 dB down at 122 kHz
  • Instrument Inputs
    • Gain range
      • 10 dB to 40 dB continuously variable
    • Input Impedance
      • 1 MΩ or 300 kΩ
    • Noise at minimum gain (+10 dB)
      • -90 dBu measured with a 22 Hz / 22 kHz bandpass filter
    • Noise at maximum gain (+40 dB)
      • -62 dBu measured with a 22 Hz / 22 kHz bandpass filter
    • THD at minimum gain (+10 dB)
      • 0.002% measured with a 10 dBu input signal and with a 22 Hz / 22 kHz bandpass filter
    • Frequency Response at 10 dB gain with -10 dB input
      • 10 Hz - 200 kHz +/- 0.6 dB
    • Frequency Response at 40 dB gain with -40 dB input
      • -2.5 dB down at 10 Hz and 0 dB at 200 kHz
  • Instrument Inputs
    • Roll off
      • 18 dB per octave 3 pole filter
    • Frequency
      • Fixed 75Hz measured at the 3dB down point
  • Weight and Dimensions
    • Weight
      • 8.84 kg
      • 19.5 lbs
    • Dimensions (W x H x D)
      • 484mm (W) x 85mm (H) x 305mm (D) (350mm depth with heat sink)
      • 19" (W) x 3.5" (H) x 12" (D) (13.8" depth with heat sink)

Focusrite ISA828 8-Channel Mic Preamp Downloads

What We Think

The Focusrite ISA828 8-Channel Mic Preamp is a multi-channel solid-state preamp which represents one of the greatest values in recording. There is quite simply a LOT of flexibility in this unit. Multiple impedance settings, Lundahl transformers, 4 instrument DIs, line inputs on each channel, the optional 8-Channel ADC... This box does a lot. And it sounds pretty good too :-) The character is smooth and somewhat contained. It's not an especially "tall" sound; but it's one that doesn't need a lot of dynamics processing either. Basically, it sounds like a record and is a good antidote to brittle sounds of digital. Be forewarned, the ISA828 does get rather warm... so be sure to leave plenty of ventilation around it. But pound for pound, this is a great first or upgrade preamp for someone who wants to track a band, who needs lots of the same character preamp for sonic continuity, and who would want to keep it around for a long time as they refine their sound.

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