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User Manual for Focusrite ISA428 MkII - Microphone Preamp Click to enlarge the picture
Contents of the user manual for the Focusrite ISA428 MkII - Microphone Preamp
- Product category: Microphone Preamps Focusrite
- Brand: Focusrite
- Description and content of package
- Technical information and basic settings
- Frequently asked questions – FAQ
- Troubleshooting (does not switch on, does not respond, error message, what do I do if...)
- Authorized service for Focusrite Microphone Preamps
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User manual for the Focusrite ISA428 MkII - Microphone Preamp contain basic instructions
that need to be followed during installation and operation.
Before starting your appliance, the user manual should be read through carefully.
Follow all the safety instructions and warnings, and be guided by the given recommendations.
User manual is an integral part of any Focusrite product,
and if it is sold or transferred, they should be handed over jointly with the product.
Following the instructions for use is an essential prerequisite for protecting
health and property during use, as well as recognition of liability on the part of the manufacturer
for possible defects should you make a warranty claim. Download an official Focusrite user manual in which you will find instructions on how to install, use, maintain and service your product.
And do not forget – unsuitable use of a Focusrite product will considerably shorten its lifespan!
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Product description - Focusrite // The ISA 428 & 828 with Damian Taylor
The ISA428 MkII from Focusrite is a four-channel microphone preamp featuring Focusrite's transformer-based preamps. With selectable input impedance, direct instrument inputs and an optional eight channels of high-quality analog to digital conversion, the unit is a perfect front end for the audio professional, whether utilizing digital or analog recording. The ISA microphone preamp holds a reputation for delivering transparency along with subtle warmth derived from transformer core saturation. The addition of a variable impedance circuit allows users to perfectly match the preamp with any microphone, or to use different settings creatively to shape the sound of the microphone. The extremely broad frequency response of Focusrite preamps (close to 200kHz at the top end) guarantees accurate phase response across the range of human hearing, with the roll-off point being moved entirely outside of the audible hearing range. Warmth, plus beautifully open, unrestricted high frequencies, is a classic hallmark of the mid 80's Focusrite designs to which this preamp owes its design. The optional eight channel analog converter utilizes high-quality Burr-Brown amplifiers and PCM4220 A-D converter chips seated within Focusrite's custom analog circuitry. Specifications include a dynamic range of 122dB and jitter performance below 250 picoseconds. The card can be retrofitted at any time and due to the convenient 25-pin D-type connector, it integrates seamlessly with most digital workstations, including Pro Tools. - Four ISA Series Transformer-Based Preamps
- ISA series microphone 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 microphone matching or extended microphone creativity - settings include the "Vintage ISA110" setting that provides the original Focusrite signature sound
- Four Front Panel Instrument Inputs
- Instant access on the front fascia - no separate DI box required
- Dedicated Analog 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
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- Phantom power available on every channel
- Trim control allows 20dB of extra gain with fine adjustment
- Phase reverse buttons help to correct phase issues with microphones or cables
- Optional A-D converters easily synchronize to external Wordclock
UPC: 815301005124 In the Box Focusrite ISA428 MkII - Microphone Preamp AC Power Cable Limited 2-Year Warranty Table of Contents
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Technical parametersFocusrite ISA428 MkII Specs | 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 trim
Line: -20dB to +10dB in 10dB steps, plus 0dB to +20dB continuously variable trim
Instrument: +10dB to +40dB continuously variable | | Input Impedance | Microphone: 600Ω, 1.4kΩ, 2.4kΩ, 6.8kΩ
Line: 10kΩ
Instrument: >1MΩ | | Maximum Output Level | Microphone: +7.4dBu
Line: +25.4dBu
Instrument: +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 150Ω 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 Filter
Roll off = 18dB per octave 3 pole filter
Frequency range: 16Hz to 420Hz (continuously variable, measured at the 3.0dB down point) | | | | Package Weight | 17.55 lb | | Box Dimensions (LxWxH) | 25.0 x 18.0 x 9.0" |
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