Focusrite ISA428 MKII 4-Channel Mic/Instrument Preamp

Special Price $1,749.99 Regular Price $2,029.99
SKU
FOCUSRITE-ISA428MK2
  • Manufacturer: Focusrite

• Phantom power available on every channel • Trim control allows 20dB of extra gain with fine adjustment • Phase reverse buttons help to correct phase issues with microphones or cables • Optional A-D converters easily synchronise to external word clock

More Information
MPN (manufacturer part number) ISA428MK2
UPC (Universal Product Code) 00815301005124
Condition New
Specs

Mic Inputs • Frequency response at minimum gain (0dB): -0.35dB at 20Hz and –3dB at 122kHz • Frequency response at maximum gain (60dB): –2.5dB at 20Hz and –3dB 103kHz • Gain range: 0dB to +60dB in 10dB steps, plus 0dB to +20dB continuously variable trim • Maximum headroom: +7.4dBu • THD+N: 0.0009% (measured at 1kHz -20dBu input signal, at 30dB gain setting, with a 20Hz/22kHz bandpass filter) • 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) • CMRR: 88dB. • Input Impedance, variable: 600Ω, 1400Ω, 2400Ω, 6800Ω Line Inputs • Frequency Response at unity gain (0dB): -0.3dB at 20Hz and –3dB at 94kHz • Gain range: -20dB to +10dB in 10dB steps, plus 0dB to +20dB continuously variable trim • Maximum headroom: +25.4dBu • THD+N: 0.002% (measured with +4dBu input signal, 0dB gain setting, with a 20Hz/22kHz bandpass filter) • 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). Input Impedance: 10kΩ Instrument Inputs • Frequency Response at +10dB gain: -0.2dB at 20Hz and 0dB at 200kHz • Frequency Response at +40dB gain: -3dB at 20Hz and –3dB at 38.4kHz • Gain range: +10dB to +40dB continuously variable • Maximum headroom: +11.5dBu • THD+N: 0.006% (measured with –20dBu input signal, at minimum gain (+10dB), with a 20Hz/22kHz bandpass filter) • Noise at main output with minimum gain (+10dB): -95dBu (measured with a 20Hz/22kHz bandpass filter) • Input Impedance = >1MΩ High Pass Filter • Roll off = 18dB per octave 3 pole filter • Frequency range: 16Hz to 420Hz (continuously variable, measured at the 3dB down point) Meters • 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 
Front and rear connectivity Analogue Channel Inputs (Inputs 1-4) • 4 instrument 1⁄4” TS jack inputs on front panel • 4 microphone XLR inputs on rear panel • 4 line 1⁄4” TRS jacks on rear panel • 4 insert return 1⁄4” TRS jacks on rear panel • 4 ADC XLR inputs on rear panel 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/O • IEC power input connector 100Vac – 240Vac Front Panel Indicators • 8 output meters, 6 segment • 4 30-60 mic gain range selection indicator • 4 +48V phantom power indicator • 4 Phase indicator • 4 Insert In indicator • 4 Filter In indicator • 4 Input selection indicators (Mic, Line, Inst) • 4 Z In microphone input impedance selection indicators (Low, ISA110, Med, High) Clock select indicators (44.1, 48, 88.2, 96, 176.4, 192) • Ext clock indicators (Lock, Word clock, 256X) Weight 5.5kg 12.2lbs Dimensions (W x H x D) 480mm (W) x 88mm (H) x 280mm (D) 19" (W) x 3.5" (H) x 11" (D)

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