ISA ONE
Classic Mic Pre With Independent DIProduct Highlights
- Classic ISA mic preamp design featuring Lundahl LL1538 input transformer
- Flexible independent DI channel
- Switchable input impedance including classic ISA 110 setting
- Headphone output with volume control
- Dedicated insert point
- Optional stereo 192kHz A-D conversion card
- Overview
- Tech Specs
Featuring a rugged, portable all-metal enclosure, ISA One combines the classic Focusrite microphone preamp with a flexible, independent DI channel and optional 192kHz precision A-D conversion. 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.
| 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 (8.6 lbs)
