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User manual for Focusrite ISA428 MkII - Microphone Preamp ISA428MK2
- Manufacturer: Focusrite
- Basic description and contents of package
- Product classification: Pro Audio - Recording - Microphone Preamps
- Safety instructions
- Startup and operation of the microphone preamps
- Tips for setting up your Focusrite
- Settings and expert assistance
- Contact Focusrite service
- Troubleshooting
- Warranty information
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We recommend checking out our discussion threads on the Focusrite ISA428 MkII - Microphone Preamp ISA428MK2,
which address similar problems with connecting and setting up Microphone Preamps Focusrite.
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User manual for the Focusrite ISA428 MkII - Microphone Preamp ISA428MK2
The user manual for the Focusrite ISA428 MkII - Microphone Preamp ISA428MK2 provides
necessary instructions for the proper use of the product Pro Audio - Recording - Microphone Preamps.
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.
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If you own a Focusrite microphone preamps and have a user manual in electronic form,
you can upload it to this website using the link on the right side of the screen.
You can upload and download the manual for the Focusrite ISA428 MkII - Microphone Preamp ISA428MK2 in the following formats:
- *.pdf, *.doc, *.txt, *.jpg - Other formats are unfortunately not supported.
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Additional parameters of the Focusrite ISA428 MkII - Microphone Preamp ISA428MK2:
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" | |
The user manual for the Focusrite ISA428 MkII - Microphone Preamp ISA428MK2 can be downloaded in .pdf
format if it did not come with your new microphone preamps, although the seller is
required to supply one. It is also quite common that customers throw out
the user manual with the box, or put the CD away somewhere and then can’t find it.
That’s why we and other Focusrite users keep a unique electronic library
for Focusrite microphone preampss,
where you can use our link to download the user manual for the Focusrite ISA428 MkII - Microphone Preamp ISA428MK2.
The user manual lists all of the functions of the Focusrite ISA428 MkII - Microphone Preamp ISA428MK2,
all the basic and advanced features and tells you how to use the microphone preamps.
The manual also provides troubleshooting for common problems. Even greater
detail is provided by the service manual, which is not typically shipped with the product,
but which can often be downloaded from Focusrite service.
If you want to help expand our database, you can upload a link to this website
to download a user manual or service manual, ideally in .pdf format. These pages
are created by you – users of the Focusrite ISA428 MkII - Microphone Preamp ISA428MK2. User manuals are also
available on the Focusrite website under Pro Audio - Recording - Microphone Preamps.
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