Focusrite ISA One is a desktop-style studio microphone preamp with independent DI channel and switchable input impedance – including classic ISA 110 setting.
Featuring a rugged, portable all-metal enclosure, ISA One combines the classic Focusrite microphone preamp with a flexible, independent DI channel. At the heart of the ISA range is the microphone preamplifier with its Lundahl input transformer – essentially the same circuit, based on the original ISA 110, that has been used for 30 years in successive Focusrite designs. The input transformer imparts a special character to the sound that can’t be truly emulated in any other way, while the modern twist of variable input impedance allows for a new degree of flexibility.
Whether you’re an artist, engineer or producer, you’ll appreciate the versatility of the ISA One, with its front-panel DI input. The DI includes low/high impedance switching and an amplifier output, and its own feed to the optional A-D converter and separate rear-panel XLR output.
About the ISA range by Focusrite:
“Since 1985, Focusrite has been a name synonymous with no-compromise mic pres following the creation of the ISA 110 for Sir George Martin’s Neve console at Air Studios. The legacy of the original ISA 110 lives on today, not only in the ISA range itself, but also in every mic pre we design”
Standing for ‘Input Signal Amplifier’, the ISA range was born out of the original Focusrite Forte console of the late 80’s, and later the Focusrite Studio Console. All ISA products use the Lundahl LL1538 input transformer and a custom Zobel network, both of which contribute to their sought-after sound.
| Mic Input Response |
| Gain range (Mic): 0dB to 60dB in 10dB steps 20 dB of variable gain |
| EIN (Mic): -126dB measured at 60dB of gain with 150 Ohm terminating impedance and 22Hz/22kHz band-pass filter |
| Noise (Mic): Noise at output with unity gain (0 dB) and 22 Hz-22 kHz band pass filter-97 dBu |
| Signal-to-Noise Ratio (Mic): 106 dB relative to max headroom (9dBu) |
| Frequency Response (Mic): At minimum gain (0 dB)-0.5dB down at 10Hz and -3dB down at 125kHz |
| CMRR (Mic): 98dB (Channel 1, 1kHz, maximum gain with 24 dBu input) |
| Crosstalk Channel to Channel (Mic): With 10dB@1kHz input to chA, chB output =104dBrA. With 10dB@10kHz input to chA, chB output = 84dBrA |
| Line Input Response |
| Gain range (Line): -20dB to 10dB in 10dB steps 20 dB of variable gain |
| Input Impedance (Line): 10 kO from 10 Hz to 200 kHz |
| Total Harmonic Distortion Noise (Line): Measured with a 0 dBu input signal, and a 22 Hz-22 kHz band pass filter0.0001 |
| Frequency Response (Line): At unity gain (0 dB)-0.3dB down at 10Hz and -3dB down at 200kHz |
| Instrument Input Response |
| Gain range (Instrument): 10dB to 40dB continuously variable |
| Input Impedance (Instrument): High = greater than 1M Low =greater than 300k |
| THD (Instrument): At minimum gain ( 10) |
| High-Pass Filter |
| Roll-Off: 18 dB per octave (3 pole filter) |
| Frequency: Fixed 75Hz measured at the 3dB down point |
| Weight and Dimensions |
| W x D x H: 220mm (W) x 104mm (H) x 254 – 290mm |
| Weight: 3.9 kg |
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