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Top » Catalog » Focusrite ISA 828 and 428 A/D Card
Focusrite ISA 828 and 428 A/D Card
[FR-828AD] Optional ADC for the ISA428, ISA428MkII and ISA828
 
Retail Price:
$604.99+IV
COSTAQ Savings:
- $55.00
COSTAQ Price:
$549.99+IV

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Focusrite Isa 828

Eight classic microphone preamplifiers and class-leading A-D conversion



  • The ISA eight channel 192kHz A-D converter outperforms every other converter yet devised, and was the first audio A-D converter to utilise Burr-Brown Pro Audio Amplifiers and flagship PCM4220 A-D converter chips. With cutting-edge conversion technology seated within Focusrite custom analogue circuitry, the card delivers unparalleled performance; specifications include a dynamic range of 122dB and jitter less than 250 picoseconds. More information about Focusrite's ISA A-D converters can be found on the right.

    The card can be retrofitted to an ISA428, ISA428 MkII or ISA828 at any time and, thanks to its convenient 25-pin D-Type connector, integrates seamlessly with Pro Tools HD as well as other popular hard disk recorders and mixing desks.

    All eight converters are always available with this option, even when using the ISA428 and ISA428 MkII. When installed in one of these four-channel mic preamps, the the extra 4 converters of the A-D card are fed by four XLR inputs on the back labeled "ADC Input".

    Digital formats include an eight-channel single/dual wire AES/EBU and S/PDIF output, as well as an eight-channel ADAT lightpipe (SMUX/SMUX2) output. Word clock i/o is provided via dedicated BNC connectors.

     


    • 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™.
     


  • We always quote 'real world' performance figures (measured to the AES17 standard). Some companies choose to quote chipset performance, which is misleading, and here's why.

    The difference between 'real world' and 'chipset' performance


    In deciding between two similar interfaces, the often hard-to-decipher performance specifications play an integral role for the audio engineer. And here’s the problem – you would be fooled if you thought that these performance figures were reliable. Because companies do not adhere to the same measurement standards, their performance figures often misrepresent the true performance of a product. Digital dynamic range figures are a classic example of this. Worse than this, some companies in the pro-recording industry quote figures from the data-sheets they receive from the manufacturers of the silicon devices they’ve selected for their product. These figures are extremely misleading, since once placed in the environment of a product, with essential circuitry around the chip, performance figures change for the worse.

    Herein lies the real talent of good product design – to get the most out the chips used. Focusrite R & D have found that the difference between real-world and chipset performance can be as much as 12dB dynamic range. In other words, a chip's D-A conversion performance might be specified at 114dB by the manufacturer, but when used within an audio interface could perform at only 102dB. That difference of 12dB is equivalent to a reduction from 19bits to 17bits – essentially, the studio is being short-changed by two bits!

    The AES17 standard provides a set of guidelines on how to accurately measure the 'real-world' performance of audio equipment. Focusrite measure to this standard, but many interface companies do not. So when you’re told that a product does ‘exactly what it says on the tin’, treat these words with caution – appearances can be deceiving.



    Output formats (All channels)


    • AES/EBU (5V / 110 ohms), S/PDIF (0.8V / 75 ohms)
    • ADAT lightpipe (SMUX I/II/IV, channels 1-4 only in 176.4kHz, 192kHz mode)
    • S/PDIF lightpipe (channels 1-4 only; mutually exclusive with ADAT lightpipe)

    Bit depth


    24 bits, internally configurable to 16 or 20 bits if necessary.


    AES3 output jitter


    <:1500ps, 50Hz-100kHz
    <:350ps, 700Hz-100kHz


    Frequency response


    All ranges: 20Hz–20kHz ± 0.3dB (100Hz–20kHz ± 0.1dB)
    176.4kHz, 192kHz : 17Hz–90kHz ± 0.5dB


    THD+n


    –121.5dB A-weighted, audio band-limited, 1kHz, -60dB FS input
    Maximum 0.0033% at –1dB FS (1kHz)
    Minimum 0.0008% at –15dB FS (1kHz)


    Idle channel noise


    117.5dB at 44.1kHz, CCIR-weighted, full bandwidth


    Crosstalk


    –100dB at 12kHz


    (Paired channels)


    –95dB at 20kHz

     








Available
 
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