ISA 428 MkII
A four-channel, 2U transformer-based microphone preamp built around Focusrite's ISA design, with front-panel instrument inputs, rear line inputs and per-channel inserts. Aimed at studios that want selectable-impedance mic pres and an optional eight-channel A-D upgrade.
- Four transformer-based ISA mic preamps in a 2U case
- Selectable mic impedance: 600, 1400, 2400 and 6800 ohms
- Up to 80 dB gain: 60 dB steps plus 20 dB trim
- Four front-panel instrument inputs and rear line inputs
- Switchable insert point on every channel
- Optional 8-channel A-D card, 122 dB dynamic range
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The ISA 428 MkII is a second-generation four-channel preamp in a 2U chassis. Each channel accepts a mic, line or front-panel instrument source. Mic impedance is selectable, with the classic ISA 110 setting plus three further values, so the preamp can be matched to vintage or modern microphones.
Gain is set with a four-position switch plus continuously variable trim, and there is a variable high-pass filter for controlling low end. Each channel has a 6-segment LED meter, and switchable insert points on the rear panel let external processors such as compressors be placed between the preamp and the output.
Outputs are four line-level XLRs, with 1/4" TRS insert sends alongside. An optional eight-channel A-D converter card, sold separately, adds digital connection to a DAW. Power comes from an IEC mains inlet accepting 100 to 240 V AC.
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Tekniset tiedot
- Merkki
- Focusrite
- Malli
- ISA 428 MkII
- Luokka
- Studio › Esivahvistimet ja outboard-laitteet
Mic inputs
- Gain range
- 0dB to 60dB in 10dB steps, plus 0dB to 20dB continuously variable trim
- Input impedance (variable)
- 600Ω, 1400Ω, 2400Ω, 6800Ω
- Frequency response at 0dB gain
- -0.35dB at 20Hz and -3dB at 122kHz
- Frequency response at 60dB gain
- -2.5dB at 20Hz and -3dB at 103kHz
- Maximum headroom
- 7.4dBu
- Noise EIN
- -126dB (60dB gain, 150Ω termination, 20Hz/22kHz bandpass)
- Noise at main output, unity gain
- -98dBu (20Hz/22kHz bandpass)
- SNR
- 123dB (relative to max output 25dBu); 120dB (relative to 0dBFS, 22dBu)
- CMRR
- 88dB
Line inputs
- Gain range
- -20dB to 10dB in 10dB steps, plus 0dB to 20dB continuously variable trim
- Frequency response at unity gain
- -0.3dB at 20Hz and -3dB at 94kHz
- Maximum headroom
- 25.4dBu
- Noise at main output, unity gain
- -91dBu (20Hz/22kHz bandpass)
- SNR
- 116dB (relative to max output 25dBu); 113dB (relative to 0dBFS, 22dBu)
- Input impedance
- 10kΩ
Instrument inputs
- Gain range
- 10dB to 40dB continuously variable
- Maximum headroom
- 11.5dBu
- Noise at main output, minimum gain (10dB)
- -95dBu (20Hz/22kHz bandpass)
- Input impedance
- >1MΩ
High-pass filter
- Roll-off
- 18dB per octave, 3-pole
- Frequency range
- 16Hz to 420Hz (continuously variable, at 3dB down point)
Outputs
- Analogue audio outputs (1-4)
- 4 line XLR outputs on rear panel
- Insert sends
- 4 x 1/4" TRS jacks on rear panel
Power
- Power input
- IEC connector, 100Vac - 240Vac
Optional A-D card
- Dynamic range
- 122dB
- Jitter
- below 250 picoseconds