FOCUSRITE ISA-428 MKII Four Classic Mic Pres
FOCUSRITE ISA-428 MKII เครื่องเปลี่ยนแปลงสัญญาณไมค์ 4 ชาแนล ISA-428 MKII ปรีแอมป์ ไมค์ จากแบรนด์ FOCUSRITE
ISA 428 MkII 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 ISA 110 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.
Each mic pre has the option of mic, line or the front-panel instrument input, with variable input impedance to ensure you are getting the best performance from the source. Up to 60dB of gain is available on the four-position rotary and gain range switches, with a further +20dB of continuously variable trim, meaning a huge 80dB of gain is available should it be required. The high-pass filter features variable cut-off frequency between 16 and 420Hz. An array of 6-segment LED meters show peak signal level for the four mic pres, in addition to the four direct inputs to the optional A-D card. Switchable rear-panel insert points allow the use of inline processors such as compression.
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Classic ISA mic preamp design featuring Lundahl LL1538 input transformer
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Instrument and line inputs with dedicated input connectors and front-panel switch
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Switchable input impedance including classic ISA 110 setting
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Variable cut-off frequency high-pass filter
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Dedicated switchable insert point
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Per-channel six-segment LED peak-level meters
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Optional A-D card with up to 192kHz, 24-bit sampling via ADAT or AES3
MIC INPUTS |
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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 |
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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 |
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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 |
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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 |
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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 I |
IEC power input connector 100Vac – 240Vac |
WEIGHT AND DIMENSIONS |
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Weight |
5.5kg (12.2lbs) |
Dimensions |
480mm (W) x 88mm (H) x 280mm (D) |