• Focusrite Pro ISA One Mic Preamp
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Focusrite Pro ISA One Mic Preamp

Focusrite Pro ISA One Mic Preamp

SoundPro Item: 16948 | Part Number: AMS-ISA-ONE

$699.99
$699.99 $699.99
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MSRP: $699.99 | MAP: $699.99

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  • 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
  • Mic, line, and instrument inputs
  • Optional stereo 192kHz A-D conversion card
  • 3 Year Warranty
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The ISA One combines the classic Focusrite microphone preamp with a flexible, independent DI channel and optional 192kHz precision A-D conversion. Encased in a rugged, portable all-metal enclosure, 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.

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Specifications

Electrical
Input Impedance High
greater than 1M
Input Impedance Low
greater than 300k
Audio
Signal-to-noise Ratio
106 dB relative to max headroom (9dBu)
Frequency Response
at minimum gain (0 dB)-0.5dB down at 10Hz and -3dB down at 125kHz
Input Impedance
10 kO from 10 Hz to 200 kHz
THD
measured with a 0 dBu input signal, and a 22 Hz-22 kHz band pass filter 0.0001
General
EIN
-126dB measured at 60dB of gain with 150 Ohm terminating impedance and 22Hz/22kHz band-pass filter
Noise
noise at output with unity gain (0 dB) and 22 Hz-22 kHz band pass filter-97 dBu
Roll-off
18 dB per octave (3 pole filter)
Frequency
fixed 75Hz measured at the 3dB down point
DSP Engine
Gain Range
0dB to 60dB in 10dB steps 20 dB of variable gain
Audio Performance
CMRR
98dB (Channel 1, 1kHz, maximum gain with 24 dBu input)

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