Focusrite ISA 428 MKII

4-Channel preamplifier

  • For microphone - instrument Hi-Z and line signals (transformer-based)
  • 4 Line outputs
  • Variable input impedance
  • Per channel: phantom power, insert, phase reverse and variable high-pass filter (16 - 420 Hz)
  • 6-Segment LED display
  • Optionally upgradeable with: 24 bit 192 kHz 8-channel AD converter card
  • Dimensions: 19"/ 2U

Further information

Channels 4
Number of microphone inputs 4
Instrument input Yes
Tubes No
Compressor/Limiter No
Equalizer No
De-Esser No
Phantom power Yes
Phase Reverse Yes
External effect loops Yes
Analogue Outputs XLR, jack
Digitale Outputs None
Headphone connection No
Level Meter Yes
9 customer ratings:
  • 5
  • 4
  • 3
  • 2
  • 1
4.9 / 5.0
  • handling
  • features
  • sound
  • quality
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HeritageSound!

09.02.2016
The ISA 428 is equipped with its standard preamps and the Lundahl LL1538 input transformer, which plays a key role in the preamplification stage along with the second-generation technology innovations of the instrument: 4 types of impedance "Z In": LOW, ISA 110, MED, HIGH / HIGH PASS FILTER and very accurate to capture even the fastest transient LED METER for each channel can offer great versatility and experimentation between different types of Input, thus recreating a variety of types Of sound; From the warm vintage sound to the more transparent and clear of modern microphones.

In a simple layout, which occupies the space of two rack units, everything is within reach.
MIC, LINE AND INSTRUMENT, the latter ideal for overcoding in the directional room.

- 48V power on each channel
- Phase Reversal on each channel
- Analog switchable switches on each channel allowing routing with an external processor

Transparency is the PREAMP key, but by adding the right colors to the input signal, it offers a large amount of gain (up to 80 dB thanks to the "TRIM / INSTRUMENT" knob), allowing you to record your audio sources in an exceptional way .

At present, used to record 4 different electric guitar cones; Playing from Ambient to Folk at Alternative Rock; Acoustic Guitars and Voices.

SENSATIONAL!
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A useful studiotool

gary73, 25.08.2014
Hello, I bought this 4 channel preamp some time ago, after I had worked with another Focusrite product in the studio at a production.
I like the features like the quadruple impedance switching and the switchable, symmetrical inserts per channel and generally the operation and optics of the device as well as of course the sound of the preamps and the different impedances.
There is a lot of "vintage neve" in it and many sensible further developments.
A lot of preamp, many useful features, great optics and a correct price compared to other providers and their products.
The connectors with XLR in / out as well as symmetrical jack sockets for the inserts are standard in the audio range, which is also very good.
The ads in dBFS are also top and always good to see.
The manual is also very good, English and German, also thumbs up.
I would buy with again or it will be in the foreseeable future the channel ISA 430 MKII, which can be much more, but unfortunately only one channel, actually you need two of them.
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