Focusrite ISA428 Pre Pack 4-Channel Microphone Preamp

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Transformer-based ISA design

Gain range:
Line = +/- 18dB
Mic = 0 to 60dB (both in 6dB steps)
Inst = +10 to +40 dB variable

Input impedance:
Line = 10k ohm
Mic = Variable - 600, 2k4 and 6k8 ohm + original ISA 110 settings
Inst = >1M ohm

Analog Performance
Line = -96dB
Mic = -128dB (EIN with 150 ohm input resistance at 60dB of gain)

Line = 0.003% with 0dBu, 1kHz input and 20Hz to 22kHz band-pass filter
Mic = 0.003%

Analog Input and Output connectors (balanced)
D.I inputs: 1/4 inch Jack (unbalanced)

Mic inputs: XLR (balanced)

Line: TRS Jack (balanced)

Insert Sends and Returns: TRS Jack (balanced)

Additional ADC inputs: XLR (balanced) Line level

Analog Outputs: XLR (balanced)

Digital Output Option
AES/EBU and S/PDIF dual 9 pin D-types

Optical - ADAT Lightpipe

Bit depths 16, 20 or 24 bit

Frequency options 44.1, 48, 88.2, 96, 176.4 and 192kHz

Clock options Standard or -256 x

Meter - 0 dBfs = +22dBu

Digital Performance

SNR - 120dB A weighted
Focusrite Warranty Focusrite offers a 3-Year Warranty on this and all other Focusrite products.
If you have additional warranty questions, please contact the manufacturer at 310-322-5500
(27 ratings)
Submitted June 30, 2005 by a customer from
This is a very unique pre. Transparent, yet somewhat colored. Best out of the new ISA range bunch as a mic pre. Great on acoustic instruments. Musical sounding pre.
Some great features such as the impedence settings, the A/D option which also can be used for 4 xtra mic pre's of your choice to run through the A/D of the ISA (bypassing for expample the 002 converters).
Its solid. Looks great. Feels great.
Great value. Great bang for the buck. Paid $2100 w/ the digital card option. Would've paid more if i had to.
Manufacturer Support
have not used their support.
The Wow Factor
Its a great 4 channel unit. Pretty damn sexy!!!! Others i'd want also are the API 3124 ($3300), or the Great River MP2NV (2 channel pre $2150)
Musical Background:
Musician, Recording Engineer, Live Sound Production...
Musical Style:
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