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Focusrite ISA 828 8 Channel Microphone Preamp

$2,499.99

See manufacturer's website for warranty information

UPC:
815301005087
SKU:
MOIF8281-UL
Availability:
Ships within 3-5 business days
Shipping:
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Product Description

Key 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

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.

Specification

Mic Inputs

Gain range 0 dB to 60 dB in 10 dB steps
Input Impedance Variable, 600, 1k4, 2k4, 6k8
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 k 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 M or 300 k
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

Other Details

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