Updated 13 May 2026
| Brand | Focusrite |
| Category | Musical Instruments |
| Available at | 1 UK stores |
| 90-day avg | £2057.00 |
Focusrite
Focusrite ISA428 Mk II 4 Channel Pre Pack Pre-Amp
£2057.00Fair Price
Cheapest at Gear4music · 1 store
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PRICE HISTORY
Current
£2075
Change
+7.2%
Avg
£2021
Low
£1932
High
£2093
Volatility
2.1%
PRODUCT DESCRIPTION
- Classic-style transformer-based preamps The Focusrite ISA428 Mk II 4 Channel Pre Pack Pre-Amp brings you four timeless classic mic preamps in a compact and user-friendly 2U enclosure. This powerful pre-amp offers four mic preamp channels as well as instrument inputs and line-ins all conveniently located at your fingertips. The original Focusrite mic pre was designed to complement the microphones of its time and this updated model offers even more versatility. With the addition of three extra input impedances to the classic ISA 110 setting you can now match any microphone whether its a vintage classic or a modern design allowing you to access a wide range of sounds. Variable input impedance and flexible controls Each mic pre on the ISA428 Mk II gives you the choice between mic line or the front-panel instrument input. With variable input impedance you can ensure that you are getting the best performance from your source. With up to 60dB of gain available on the four-position rotary and gain range switches as well as an additional +20dB of continuously variable trim you have a staggering 80dB of gain at your disposal. This makes the ISA428 Mk II perfect for capturing everything from subtle nuances to powerful performances. The high-pass filter also offers variable cut-off frequency ranging from 16 to 420Hz. Four additional AD converter inputs for high-end conversion To further enhance its audio processing capabilities the ISA428 Mk II offers optional A-D conversion giving you four additional A-D converter inputs. This allows for up to eight channels of high-quality conversion with a dynamic range of 122dB and exceptional jitter performance below 250 picoseconds. This optional feature takes your audio recordings to a whole new level of clarity and precision. Selectable impedance for enhanced clarity The Focusrite ISA428 Mk II gives you the freedom to experiment and explore different sonic possibilities. With selectable impedance settings including the legendary Vintage ISA110 setting you can achieve the original signature sound that Focusrite is known for. This feature allows you to match different microphones or push the boundaries of your creativity with various impedance settings. Features Four 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 Mic inputs Frequency Response At Minimum Gain (0dB) (Mic): -0.35dB at 20Hz and &ndash
- 3dB at 122kHz Frequency Response At Maximum Gain (60dB) (Mic): &ndash
- 2.5dB at 20Hz and &ndash
- 3dB 103kHz Gain Range (Mic): 0dB to 60dB in 10dB steps plus 0dB to 20dB continuously variable trim Maximum Headroom (Mic): 7.4dBu Noise EIN (Mic): -126dB (measured at 60dB of gain with 150O termination and 20Hz/22kHz bandpass filter) Noise At Main Output With Unity Gain (Mic): -98dBu (measured with a 20Hz/22kHz bandpass filter) SNR (Mic): 123dB (relative to max output 25dBu) 120dB (relative to 0dBFS ( 22dBu) CMRR (Mic): 88dB Input Impedance Variable (Mic): 600O 1400O 2400O 6800O Line inputs Frequency Response At Unity Gain (0dB) (Line): -0.3dB at 20Hz and &ndash
- 3dB at 94kHz Gain Range (Line): -20dB to 10dB in 10dB steps plus 0dB to 20dB continuously variable trim Maximum Headroom (Line): 25.4dBu THD N (Line): 0.002 (measured with 4dBu input signal 0dB gain setting with a 20Hz/22kHz bandpass filter) Noise At Main Output With Unity Gain (Line): -91dBu (measured with a 20Hz/22kHz bandpass filter) SNR (Line): 116dB (relative to max output 25dBu) 113dB (relative to 0dBFS 22dBu) Input Impedance: 10kO Instrument inputs Frequency Response At 10dB Gain (Instrument): -0.2dB at 20Hz and 0dB at 200kHz Frequency Response At 40dB Gain (Instrument): -3dB at 20Hz and &ndash
- 3dB at 38.4kHz Gain Range (Instrument): 10dB to 40dB continuously variable Maximum Headroom (Instrument): 11.5dBu Noise At Main Output With Minimum Gain ( 10dB) (Instrument): -95dBu (measured with a 20Hz/22kHz bandpass filter) Input Impedance (Instrument): >1MO High-pass filter Roll Off: 18dB per octave 3 pole filter Frequency Range: 16Hz to 420Hz (continuously variable measured at the 3dB down point) Front and rear connectivity Analogue Audio Outputs (Outputs 1-4): 4 line XLR outputs on rear panel 4 insert send 1/4&rdquo
- TRS jacks on rear panel Other I/O: IEC power input connector 100Vac &ndash
- 240Vac Physical Height: 3.5" Depth: 11" Width: 19" Weight: 12.2 lbs Product Code: MOIF428MK2UKEU