Focusrite ISA 828 8-Channel Mic Preamp

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  • Our Price £1,999.00
  • Manufacturer SKU: FR-ISA828
  • Soundslive ID: 9336
  • Weight: 10 kg
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Focusrite ISA 828 8-Channel Mic Preamp  - Information

Focusrite ISA828 delivers multi-channel ISA premium grade microphone preamps for professional multi-tracking and recording. Focusrite ISA 828 features eight original ISA transformer-based microphone pre-amplifiers in a single robust 2U chassis, offering the Focusrite signature sound at its lowest cost per channel to date. ISA828 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).

ISA 828 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 new optional eight-channel 192kHz ADC is the first audio ADC to utilise 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 ISA 828 8-Channel Mic Preamp  - Specifications

  • Eight ISA series transformer-based pre amps. In a single robust 2U chassis, offering the classic Focusrite pre at its lowest cost-per-channel to date.
  • New Optional Eight Channel 192kHz ADC. 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 pre amp and the ADC, 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 Digidesign’s HD
  • Mic Input Response
    Gain range: 0dB to 60dB in 10dB steps
    Input Impedance, variable: 600 Ohm, 1k4 Ohm, 2k4 Ohm, 6k8 Ohm
    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 Ohm 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 Ohm or 300k Ohm
    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
  • Weight
    8.84kg
    19.5Ibs
  • Dimensions
    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)


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