ISA 428 MkII
AED 9,112
Classic ISA four-channel mic pre
Available on backorder
Authorised Distributor
Now in its second generation, the ISA 428 Mk II incorporates four of Focusrite’s renowned mic pres in a simple-to-operate 2U enclosure, placing four mic preamps, instrument inputs and line ins at your fingertips.
The original Focusrite mic pre was designed to suit the microphones of the time; today’s model makes one small change, adding three additional input impedances to the classic ISA110 setting, allowing you to match any microphone, old or new, and access a wide range of sounds, from the character and warmth of a vintage mic to the clear transparency of a modern design. Or you can experiment and bring out just the qualities you want.
In addition to the mic inputs, there are four front-panel instrument inputs making the ISA428 Mk II ideal for overdubs in the control room with no need for a DI box. On the back: four line inputs and switchable insert points on each channel to allow routing via external signal processors. There’s also a versatile, vintage design variable high-pass filter to control what’s going on at the bass end.
And finally… accurate, 6-LED meters to tell you exactly what’s going down. Optionally available for the ISA428 Mk II is a precision eight-channel A-D converter with 122dB dynamic range and superb jitter performance — ideal for simple interfacing with your DAW (sold separately).
Key Features
- Four ISA series transformer-based preamps — ISA series mic 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 mic matching or extended microphone creativity. Settings include the ‘Vintage ISA110’ setting, providing the original focusrite signature sound.
- Four front panel instrument inputs — Instant access on the face of the unit – no separate DI box required.
- Dedicated analogue insert points — Switchable insert points are featured on every channel, allowing routing (between preamp and output) through additional external processing.
- Accurate LED meters for every channel — Clear metering designed to catch even the fastest and most elusive of transients.
Specifications
Mic inputs
- Frequency Response At Minimum Gain (0dB) (Mic)-0.35dB at 20Hz and –3dB at 122kHz
- Frequency Response At Maximum Gain (60dB) (Mic)–2.5dB at 20Hz and –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 –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
- Frequency Response At 10dB Gain (Instrument)-0.2dB at 20Hz and 0dB at 200kHz
- Frequency Response At 40dB Gain (Instrument)-3dB at 20Hz and –3dB at 38.4kHz
Instrument inputs
- 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 Off18dB per octave 3 pole filter
- Frequency Range16Hz 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” TRS jacks on rear panel
- Other I/OIEC power input connector 100Vac – 240Vac