Focusrite ISA 428 MKII Four-channel microphone preamp

Focusrite ISA 428 MKII Four-channel microphone preamp

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$1,499.99

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Focusrite's ISA428 Mk II gives you four transformer based microphone preamps based on the time tested 1985 design. Expansion options allow this studio solution to integrate into your digital studio. A great solution for analog studios looking for more preamps, or digital studios looking for a digital front end, your key to pristine sound is waiting at UniqueSquared.com.
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Description Four ISA series transformer-based preamps

ISA series mic preamps have been the producers’ choice on countless hit records over the last two decades.

Eight-channel optional A-D converter

Four additional A-D converter inputs allow eight channels of high-quality conversion, with a dynamic range of 122dB and jitter performance below 250 picoseconds.

Selectable impedance

Ideal for mic matching or extended microphone creativity. Settings include the ‘Vintage ISA110’ setting, providing the original Focusrite signature sound.

Four front panel instrument inputs

Instant access on the front fascia - no separate DI box required.

Dedicated analogue insert points

Switchable insert points are featured on every channel, allowing routing (between pre-amp and output) through additional external processing.

Variable high pass Focusrite filter

Provided on every channel, this is the same filter as featured on the original ISA428.

Accurate LED meters for every channel

Clear metering designed to catch even the fastest and most elusive of transients.

Additional Features

Phantom power available on every channelTrim control allows 20dB of extra gain with fine adjustmentPhase reverse buttons help to correct phase issues with microphones or cablesOptional A-D converters easily synchronise to external word clock

SKU FOC-ISA428MKII
MPN ISA 428 MKII
Features

The ISA428 MkII provides four of Focusrite’s prestigious transformer-based microphone preamps. It features the same classic circuitry and renowned audio quality found in the original at a new level of affordability. With selectable input impedance, direct instrument inputs and an optional eight channels of high-quality analogue to digital conversion, the ISA428 MkII creates the perfect front end for the discerning recording professional.

First introduced in 1985, the ISA microphone preamp holds a reputation for outstanding transparency along with subtle warmth contributed by transformer core saturation. The addition of a variable impedance circuit allows ISA users to perfectly match the preamp with any microphone, or to use different settings creatively to shape the sound of the microphone. Unchanged for decades, the ISA microphone preamp topology offers incredible clarity and the signature Focusrite sound that makes it the top choice among many audio professionals today.

The optional class-leading eight-channel A-D converter option used with the ISA828 is also compatible with the ISA428 MkII. Along with the four mic preamp inputs, four additional inputs allow you to route other line signals through the converter. High quality Burr-Brown Pro Audio Amplifiers and flagship PCM4220 A-D converter chips seated within Focusrite custom analogue circuitry deliver unparalleled performance. Specifications include a dynamic range of 122dB and jitter performance below 250 picoseconds. The card can be retrofitted at any time. Thanks to its convenient 25-pin D-Type connector, it integrates seamlessly with most digital workstations, including Pro Tools.

Four instrument inputs, instantly accessible on the front panel, allow quick and easy connection without the need for a separate DI box. Extra processing can be placed between preamp and conversion via the units dedicated insert points, featured on every channel. Finally, accurate six-segment LED metering is designed to catch even the fastest transients on every channel.

Over 25 years, Focusrite has earned a reputation for bringing superb audio quality and engineering excellence to an array of audio professionals. Whether you’re looking to preserve the sound of your classic microphones, or searching for the perfect front end for your digital studio, the ISA428 MkII brings legendary tools to your studio at an exceptional new price.

Focusrite ISA428 MKII Mic preamp Features:
  • 4 classic transformer-based preamps
  • Switchable impedance for unparalleled mic matching or extended mic creativity
  • Includes the classic ISA 110 setting
  • Multiple direct instrument inputs on the front panel
  • Analog insert points on every channel
  • Highpass filters on every channel
  • Ultra-precise LED metering (dBfs)
  • 2U chassis design
  • Optional A/D card provides 8 channels of cutting-edge conversion at up to 192kHz
Specifications
Focusrite ISA428 MKII Mic preamp Specifications:
Number of Channels
4
Inputs
4 x XLR Microphone (rear panel)4 x 1/4" TS phone Instrument (front panel)4 x 1/4" TRS phone Line (rear panel)4 x 1/4" TRS phone Insert Return (front Panel)4 x XLR ADC Input for optional AD converter card (rear panel)
Output
4 x XLR Line (rear panel)4 x 1/4" TRS phone Insert Send (rear panel)
Phantom Power
+48V individually switchable
Multi Function
Has provision for optional analog to digital converter
Gain Range
Microphone: 0dB to +60dB in 10dB steps, plus 0dB to +20dB continuously variable trimLine: -20dB to +10dB in 10dB steps, plus 0dB to +20dB continuously variable trimInstrument: +10dB to +40dB continuously variable
Input Impedance
Microphone: 600O, 1.4kO, 2.4kO, 6.8kOLine: 10kOInstrument: >1MO
Maximum Output Level
Microphone: +7.4dBuLine: +25.4dBuInstrument: +11.5dBu
Frequency Response
Microphone: -0.35dB at 20Hz and -3.0dB at 122kHz (0dB gain) and -2.5dB at 20Hz and -3.0dB at 103kHz (60dB gain)Line: -0.3dB at 20Hz and -3dB at 94kHz (0dB gain)Instrument: -0.2dB at 20Hz and 0dB at 200kHz (+10dB gain) and -3.0dB at 20Hz and -3.0dB at 38.4kHz (+40dB gain)
THD + N
Microphone: 0.0009% (measured at 1kHz, -20dBu input signal, at 30dB gain setting, with a 20Hz/22kHz bandpass filter)Line: 0.002% (measured with +4dBu input signal, 0dB gain setting, with a 20Hz/22kHz bandpass filter)Instrument: 0.006% (measured with -20dBu input signal, at minimum gain (+10dB), with a 20Hz/22kHz bandpass filter)
Noise
Microphone:Noise EIN: -126dB (measured at 60dB of gain with 150O termination and 20Hz/22kHz bandpass filter)Noise at main output with unity gain: -98dBu (measured with a 20Hz/22kHz bandpass filter)SNR: 123dB (relative to max output 25dBu)SNR: 120dB (relative to 0dBFS (+22dBu)Line:Noise at main output with unity gain: -91dBu (measured with a 20Hz/22kHz bandpass filter)SNR: 116dB (relative to max output 25dBu)SNR: 113dB (relative to 0dBFS +22dBu)Instrument:Noise at main output with minimum gain (+10dB): -95dBu (measured with a 20Hz/22kHz bandpass filter)
CMRR
Microphone: 88dB
Meters
Each 6-LED meter is calibrated 0dBFS = +22dBu (the maximum level which can be correctly converted by the optional internal A/D converter before overload occurs). The meter calibration points are as follows (Meter panel calibration value in dBFS / Equivalent dBu value):0dBFS / +22dBu-2dBFS / +20dBu-6dBFS / +16dBu-12dBFS / +10dBu-18dBFS / +4dBu-42dBFS / -20dBu
Power Requirements
100VAC~240VAC
Dimensions (WxDxH)
19" x 11" x 3.5" (483 x 279 x 89mm)
Weight
12.2 lbs (5.5kg)
Specialties
High Pass FilterRoll off = 18dB per octave 3 pole filterFrequency range: 16Hz to 420Hz (continuously variable, measured at the 3.0dB down point)
Package Contents
  • (1) Focusrite ISA 428 MKII microphone preamp
  • (1) USA Power Plug
  • [100-240V 50/60Hz]
  • (1) Warranty
Warranty Details Warranty Information
Product: Period:
Focusrite ISA428 MKII Mic preamp 1 Year
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Rating

Description

Description Four ISA series transformer-based preamps

ISA series mic preamps have been the producers’ choice on countless hit records over the last two decades.

Eight-channel optional A-D converter

Four additional A-D converter inputs allow eight channels of high-quality conversion, with a dynamic range of 122dB and jitter performance below 250 picoseconds.

Selectable impedance

Ideal for mic matching or extended microphone creativity. Settings include the ‘Vintage ISA110’ setting, providing the original Focusrite signature sound.

Four front panel instrument inputs

Instant access on the front fascia - no separate DI box required.

Dedicated analogue insert points

Switchable insert points are featured on every channel, allowing routing (between pre-amp and output) through additional external processing.

Variable high pass Focusrite filter

Provided on every channel, this is the same filter as featured on the original ISA428.

Accurate LED meters for every channel

Clear metering designed to catch even the fastest and most elusive of transients.

Additional Features

Phantom power available on every channelTrim control allows 20dB of extra gain with fine adjustmentPhase reverse buttons help to correct phase issues with microphones or cablesOptional A-D converters easily synchronise to external word clock

SKU FOC-ISA428MKII
MPN ISA 428 MKII

Features

Features

The ISA428 MkII provides four of Focusrite’s prestigious transformer-based microphone preamps. It features the same classic circuitry and renowned audio quality found in the original at a new level of affordability. With selectable input impedance, direct instrument inputs and an optional eight channels of high-quality analogue to digital conversion, the ISA428 MkII creates the perfect front end for the discerning recording professional.

First introduced in 1985, the ISA microphone preamp holds a reputation for outstanding transparency along with subtle warmth contributed by transformer core saturation. The addition of a variable impedance circuit allows ISA users to perfectly match the preamp with any microphone, or to use different settings creatively to shape the sound of the microphone. Unchanged for decades, the ISA microphone preamp topology offers incredible clarity and the signature Focusrite sound that makes it the top choice among many audio professionals today.

The optional class-leading eight-channel A-D converter option used with the ISA828 is also compatible with the ISA428 MkII. Along with the four mic preamp inputs, four additional inputs allow you to route other line signals through the converter. High quality Burr-Brown Pro Audio Amplifiers and flagship PCM4220 A-D converter chips seated within Focusrite custom analogue circuitry deliver unparalleled performance. Specifications include a dynamic range of 122dB and jitter performance below 250 picoseconds. The card can be retrofitted at any time. Thanks to its convenient 25-pin D-Type connector, it integrates seamlessly with most digital workstations, including Pro Tools.

Four instrument inputs, instantly accessible on the front panel, allow quick and easy connection without the need for a separate DI box. Extra processing can be placed between preamp and conversion via the units dedicated insert points, featured on every channel. Finally, accurate six-segment LED metering is designed to catch even the fastest transients on every channel.

Over 25 years, Focusrite has earned a reputation for bringing superb audio quality and engineering excellence to an array of audio professionals. Whether you’re looking to preserve the sound of your classic microphones, or searching for the perfect front end for your digital studio, the ISA428 MkII brings legendary tools to your studio at an exceptional new price.

Focusrite ISA428 MKII Mic preamp Features:
  • 4 classic transformer-based preamps
  • Switchable impedance for unparalleled mic matching or extended mic creativity
  • Includes the classic ISA 110 setting
  • Multiple direct instrument inputs on the front panel
  • Analog insert points on every channel
  • Highpass filters on every channel
  • Ultra-precise LED metering (dBfs)
  • 2U chassis design
  • Optional A/D card provides 8 channels of cutting-edge conversion at up to 192kHz

Specs

Specifications
Focusrite ISA428 MKII Mic preamp Specifications:
Number of Channels
4
Inputs
4 x XLR Microphone (rear panel)4 x 1/4" TS phone Instrument (front panel)4 x 1/4" TRS phone Line (rear panel)4 x 1/4" TRS phone Insert Return (front Panel)4 x XLR ADC Input for optional AD converter card (rear panel)
Output
4 x XLR Line (rear panel)4 x 1/4" TRS phone Insert Send (rear panel)
Phantom Power
+48V individually switchable
Multi Function
Has provision for optional analog to digital converter
Gain Range
Microphone: 0dB to +60dB in 10dB steps, plus 0dB to +20dB continuously variable trimLine: -20dB to +10dB in 10dB steps, plus 0dB to +20dB continuously variable trimInstrument: +10dB to +40dB continuously variable
Input Impedance
Microphone: 600O, 1.4kO, 2.4kO, 6.8kOLine: 10kOInstrument: >1MO
Maximum Output Level
Microphone: +7.4dBuLine: +25.4dBuInstrument: +11.5dBu
Frequency Response
Microphone: -0.35dB at 20Hz and -3.0dB at 122kHz (0dB gain) and -2.5dB at 20Hz and -3.0dB at 103kHz (60dB gain)Line: -0.3dB at 20Hz and -3dB at 94kHz (0dB gain)Instrument: -0.2dB at 20Hz and 0dB at 200kHz (+10dB gain) and -3.0dB at 20Hz and -3.0dB at 38.4kHz (+40dB gain)
THD + N
Microphone: 0.0009% (measured at 1kHz, -20dBu input signal, at 30dB gain setting, with a 20Hz/22kHz bandpass filter)Line: 0.002% (measured with +4dBu input signal, 0dB gain setting, with a 20Hz/22kHz bandpass filter)Instrument: 0.006% (measured with -20dBu input signal, at minimum gain (+10dB), with a 20Hz/22kHz bandpass filter)
Noise
Microphone:Noise EIN: -126dB (measured at 60dB of gain with 150O termination and 20Hz/22kHz bandpass filter)Noise at main output with unity gain: -98dBu (measured with a 20Hz/22kHz bandpass filter)SNR: 123dB (relative to max output 25dBu)SNR: 120dB (relative to 0dBFS (+22dBu)Line:Noise at main output with unity gain: -91dBu (measured with a 20Hz/22kHz bandpass filter)SNR: 116dB (relative to max output 25dBu)SNR: 113dB (relative to 0dBFS +22dBu)Instrument:Noise at main output with minimum gain (+10dB): -95dBu (measured with a 20Hz/22kHz bandpass filter)
CMRR
Microphone: 88dB
Meters
Each 6-LED meter is calibrated 0dBFS = +22dBu (the maximum level which can be correctly converted by the optional internal A/D converter before overload occurs). The meter calibration points are as follows (Meter panel calibration value in dBFS / Equivalent dBu value):0dBFS / +22dBu-2dBFS / +20dBu-6dBFS / +16dBu-12dBFS / +10dBu-18dBFS / +4dBu-42dBFS / -20dBu
Power Requirements
100VAC~240VAC
Dimensions (WxDxH)
19" x 11" x 3.5" (483 x 279 x 89mm)
Weight
12.2 lbs (5.5kg)
Specialties
High Pass FilterRoll off = 18dB per octave 3 pole filterFrequency range: 16Hz to 420Hz (continuously variable, measured at the 3.0dB down point)

Contents

Package Contents
  • (1) Focusrite ISA 428 MKII microphone preamp
  • (1) USA Power Plug
  • [100-240V 50/60Hz]
  • (1) Warranty

Warranty

Warranty Details Warranty Information
Product: Period:
Focusrite ISA428 MKII Mic preamp 1 Year

Reviews

Reviews
  1. Be the first to review this product

Write Your Own Review

Post a product review while logged into your store account for a chance at earning 100 Unique Reward points! (Pending Approval)

  1 star 2 stars 3 stars 4 stars 5 stars
Rating