Name: Focusrite ISA One Classic Single-Channel Mic Pre
SKU: 70972
Availability: InStock

Focusrite ISA One Classic Single-Channel Mic Pre

$94.00

Focusrite brings their prestigious ISA preamp legacy to the modern age with the ISA One. This innovative single-channel mic preamp, combining the sought-after tone of the original ISA 110 with optional high-resolution A/D conversion and a versatile DI input.

Legendary ISA 110 Preamp with Lundahl Transformer

At the heart of the ISA One is the same preamp circuit found in the revered ISA 110, using a Lundahl input transformer to impart a signature warmth and character to any microphone. Four impedance settings let you shape your tone, from transparent clarity to a round, full-bodied sound that brings out the essence of a classic mic.

Parallel DI Blends Direct and Preamp Signals

Whether recording vocals or instruments, the ISA One’s front-panel DI input provides a separate feed to blend in with the preamp signal. Select high or low impedance and adjust the level to create custom tones not possible with a preamp alone.

Optional 192kHz A/D Conversion for Digital Recording

For those working in a digital recording environment, the ISA One offers an optional 24-bit/192kHz A/D card to convert your analog signals with pristine clarity. Connect the ISA One to your computer via USB or Firewire and capture every nuance of your performance.

Take This Legendary Sound Anywhere

Despite its esteemed heritage, the ISA One is designed for maximum portability with a rugged all-metal enclosure. Use it to warm up digital mixes in your studio one day and enhance live vocals the next. Wherever your music takes you, the ISA One delivers the sought-after Focusrite sound.

Free bx_console Focusrite Plug-In

Your ISA One purchase also includes the new bx_console Focusrite plug-in, modeled after the ISA 110 and ISA 130 modules from the original Focusrite Studio Console. Faithfully recreating the tone and feel of these iconic preamps, the bx_console Focusrite is an invaluable mixing tool for re-amping tracks or adding analog warmth to digital recordings.

ISA Series Transformer-based Preamplifier
Flexible Independent DI Channel
Switchable Impedance
Headphone Output with Volume Control
Dedicated Insert Point
Optional stereo 192kHz A-D converter
Lundahl LL1538 Input Transformer
Focusrite offers a 3-year manufacturer’s warranty

Mic Input Response

Gain range: 0dB to 60dB in 10dB steps + 20dB of variable gain
Input Impedance, variable as follows:
(Switched Impedance setting Equivalent Input Impedance at 1kHz)
Low: 600 ohms
ISA110: 1,400 ohms
Med: 2,400 ohms
High: 6,800 ohms
EIN (equivalent input noise): –126dB measured at 60dB of gain with 150 ohm terminating impedance and 22Hz/22kHz band-pass filter
Noise at main output with gain at unity (0dB): –97dBu measured with a 22Hz/22kHz band-pass filter
Signal to noise ratio relative to max headroom (9dBu): 106dB
THD at medium gain (30dB): 0.0009% measured with a 1kHz –20dBu input signal and with a 22Hz/22kHz band-pass filter
Frequency response at minimum gain (0dB): –0.5dB down at 10Hz and –3dB down at 125kHz
Frequency response at maximum gain (60dB): –3dB down at 16Hz and –3dB down 118kHz
CMRR=98dB (Channel 1, 1kHz, maximum gain with +24 dBu input)
Crosstalk Channel to Channel: with 10dB@1kHz input to chA, chB output: 104dBrA. With 10dB@10kHz input to chA, chB output: 84dBrA

Line Input Response:

Gain range: –20dB to +10dB in 10dB steps +20dB of variable gain
Input Impedance: 10kΩ from 10Hz to 200kHz
Noise at main output with gain at unity (0dB): -96dBu measured with a 22Hz/22kHz band-pass filter
Signal to noise ratio relative to max headroom (24dBu)=120dB
Signal to noise ratio relative to 0dBFS (+22dBu): 118dB
THD at unity gain (0dB): 0.001% measured with a 0dBu input signal and with a 22Hz/22kHz band-pass filter
Frequency Response at unity gain (0dB): –0.3dB down at 10Hz and -3dB down at 200kHz

Instrument Input Response

Gain range: 10dB to 40dB continuously variable
Input Impedance:
High: greater than1 mohm
Low:greater than 300 kohm
Noise at minimum gain (+10dB): –92dBu measured with a 22Hz/22kHz band-pass filter
Noise at maximum gain (+40dB): –62dBu measured with a 22Hz/22kHz band-pass filter
THD at minimum gain (+10dB): 0.001% measured with a 10dBu input signal and with a 22Hz/22kHz band-pass filter
Frequency Response at 10dB gain with –10dB input: 10Hz-100kHz +/- 0.6dB
Frequency Response at 40dB gain with –40dB input: –2.5dB down at 10Hz and 0dB at 100kHz

High-Pass Filter

Roll off: 18dB per octave 3-pole filter
Fixed Frequency 75Hz measured at the 3dB down point

Meters

Moving coil (MC) meter is factory calibrated to 0VU: +4dBu with 1kHz sinewave
With the VU Cal button pressed the meter can be adjusted on the rear panel to allow 0VU to equal +10dBu to +26dBu with the centre detent being equal to +22dBu
Peak LED meters calibrated in the detent position for 0dBFS: +22dBu, calibration is adjustable on the rear panel to allow 0dBFS to equal +10dBu to +26dBu
Routing for MC and Peak1 meter is after the HPF, pre insert send or switched post insert return. Peak2 is always pre ADC channel 2, which can be fed by external input or Instrument input
LED levels are as follows when peak calibration is set to center detent on the rear panel (This is when using the internal ADC)
0: +22dBu
2: +20dBu
–6: +16dBu
–12: +10dBu
–18: +4dBu
–42: -20dBu