The preamps from the million-dollar Focusrite Forte console made affordable.

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The Focusrite ISA-828 8-channel microphone pre-amplifier provides 8 original ISA transformer-based pre amps in a single robust 2U chassis. Offers you the Focusrite signature sound at its lowest cost-per-channel to date.

The eight ISA-series transformer-based microphone pre amps, with switchable impedance and direct instrument inputs, are complemented by eight line inputs, eight line outputs and an optional eight-channel 192kHz ADC. The pre amps feature exactly the same vintage 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). Thanks to its convenient 25-pin D-Type connectors, the ISA828 integrates quickly and seamlessly with ProTools HD, as well as other popular hard disc recorders and mixing desks.

The microphone input stage includes a variable impedance circuit, allowing the user to switch between four carefully selected input impedance settings. The original ISA 110 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 points are also featured on every channel, should the need arise to place extra processing between the pre amp and converter, Vintage design high pass filters are also provided on every channel, ideal for eliminating unwanted low frequencies without affecting the rest of the audio signal.

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 < 250 picoseconds.

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

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Focusrite ISA-828 8-Channel Mic Pre-amp Features:

8-channel microphone pre-amp
8 original ISA transformer-based pre amps in a single robust 2U chassis
Switchable impedance and direct instrument inputs
8 line inputs
8 line outputs
An optional 8-channel 192kHz ADC
25-pin D-Type connectors
Integrates quickly and seamlessly with ProTools HD and other hard disc recorders and mixing desks
The microphone input stage includes a variable impedance circuit, allowing the user to switch between four input impedance settings, including the original ISA 110 setting, to suit any microphone
4 front panel direct instrument inputs feature high and low impedance options to provide a comprehensive and accessible DI solution
Insert points and vintage design high pass filters featured on every channel
Optional eight-channel 192kHz ADC provides eight channels of unparalleled A/D conversion, delivering a dynamic range of 122dB and jitter at < 250 picoseconds
Every channel features a six LED input meter with precise global meter trim
High-pass filter, phase reverse, and phantom power independent on each channel

Focusrite ISA-828 8-Channel Mic Pre-amp Specifications:

Mic Input Response
Gain range = 0dB to 60dB in 10dB steps
Input Impedance, variable as follows:-
Switched Impedance setting Equivalent Input Impedance at 1kHz
Low 600
ISA 110 1400
Med (Medium) 2400
High 6800
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
Ohms 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:
High >1M Ohms
Low > 300k Ohms
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
Input Meter
Calibrated in the detent position for 0dBFS = +22dBu and indicates the level after the High Pass Filter and before the
Insert Send output. LED levels are as follows:
0 = +22dBu
-2 = +20dBu
-6 = +16dBu
-12 = +10dBu
-18 = +4dBu
-42 = -20dBu
Calibration is adjustable to allow 0dBFS to equal +10dBu to +26dBu

Focusrite ISA-828 8-Channel Mic Pre-amp

All Focusrite products are built to the highest standards and should provide reliable performance for many years, subject to reasonable care, use, transportation and storage.

In the event of a Manufacturing Defect becoming evident within 12 months from date of purchase Focusrite undertakes that the product will be repaired or replaced free of charge if the product is returned to the authorised dealer from whom it was purchased. In these circumstances, or if you need an out-of-warranty repair to your Focusrite product, please contact your local Focusrite distributor in your country of residence or business : Find your local distributor here and you will be advised of the correct return procedure.

Alternatively contact the Focusrite Reseller from which you purchased the product. If you purchase a Focusrite product outside your country of residence or business you will not be entitled to ask your local Focusrite Distributor to honour this Limited Warranty, although you may request a chargeable repair.

Alternatively, the unit may be returned at your cost to the dealer you purchased the unit from so that they can organise a Warranty repair with their Focusrite Distributor.

This Warranty does not include cost of shipping to and from the authorised dealer from whom it was purchased. In every case it will be necessary to provide the original invoice or store receipt to accompany the defective product to the supplying dealer. This Limited Warranty is offered solely to the first purchaser of the product from an Authorised Focusrite Reseller (defined as a reseller which has purchased the Product directly from Focusrite Audio Engineering Ltd. in the UK or its Authorised Distributors outside the U.K,) and is not transferable.

This Warranty is in addition to your Statutory Rights in the country of purchase.

Please note: A Manufacturing Defect is defined as a defect in the performance of the product which may be expected from a reasonable interpretation of the published description and performance specifications as published by Focusrite Audio Engineering Ltd. This does not include damage caused by post-purchase transportation, storage or careless handling, nor damage caused by misuse.

A significant proportion of products returned under Warranty (which are very few in number compared to numbers sold) are found not to exhibit any fault at all. Please check that the mains voltage is correctly set for your local supply and that your connecting cables are in good order and correctly connected.

If in doubt about the product functions please read the user guide and if necessary contact your dealer for advice before returning the product to the supplying dealer. You can also contact the Focusrite Tech Support team at the Focusrite Answerbase for general advice.

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