Focusrite ISA One
Featuring a rugged, portable, all-metal housing, the focusrite ISA One combines the classic Focusrite mic preamp with a flexible, independent DI channel and optional 192 kHz accurate AD conversion. The heart of the ISA range is the mic preamp with its Lundahl input transformer – essentially the same circuit, based on the original ISA 110, which has been used in successive Focusrite designs for 30 years. The input transformer gives a special character to the sound that cannot be truly recreated in any other way, while the modern twist of variable input impedance allows a new degree of flexibility.
Whether you’re an artist, engineer or producer, you’ll appreciate the versatility of the ISA One, with the DI input on the front panel. The DI includes low- and high-impedance switching and an amplifier output, as well as its own power supply to the optional AD converter and a separate XLR output on the rear panel.
MIC INPUT RESPONSE ISA ONE
- Gain Range (Microphone)
- 0dB to 60dB in 10dB steps 20 dB variable gain
- EIN (Microphone)
- -126dB measured at 60dB gain with 150 Ohm termination impedance and 22Hz/22kHz bandpass filter
- Noise (Microphone)
- Noise at the output with unity gain (0 dB) and 22 Hz-22 kHz bandpass filter-97 dBu
- Signal-to-Noise Ratio (Microphone)
- 106 dB relative to maximum headroom (9dBu)
- Frequency Response (Microphone)
- At minimum gain (0 dB) -0.5 dB lower at 10 Hz and -3 dB lower at 125 kHz
- CMRR (Microphone)
- 98dB (channel 1, 1 kHz, maximum gain with 24 dBu input)
- Crosstalk Channel To Channel (Microphone)
- With 10dB @ 1kHz input to chA, chB output = 104dBrA. With 10dB @ 10kHz input to chA, chB output = 84dBrA
LINE INPUT RESPONSE ISA ONE
- Gain Range (Line)
- -20dB to 10dB in 10dB steps 20 dB variable gain
- Input Impedance (Line)
- 10 kO from 10 Hz to 200 kHz
- Total Harmonic Distortion Noise (Line)
- Measured with an input signal of 0 dBu and a bandpass filter of 22 Hz-22 kHz
- Frequency Range (Line)
- At unit gain (0 dB) -0.3 dB lower at 10 Hz and -3 dB lower at 200 kHz
INSTRUMENT INPUT RESPONSE ISA ONE
- Gain Range (Instrument)
- 10dB to 40dB continuously variable
- Input Impedance (Instrument)
- High = greater than 1M Low = greater than 300k
- THD (Instrument)
- At minimum profit (10)
HIGH PASS FILTER ISA ONE
- unroll
- 18 dB per octave (3-pole filter)
- Frequency
- Fixed 75 Hz measured at the 3dB . down point
WEIGHT AND DIMENSIONS
- BXDXH
- 220mm (W) x 104mm (H) x 254 – 290mm
- Weight
- 3.9kg (8.6lbs)
