Focusrite ISA one mic preamp - $350 (kentfield / ross)


condition: excellent
make / manufacturer: Focusrite
model name / number: ISA one

Focusrite ISA one mic pre designed by Rupert Neve

Classic Mic Pre With Independent DI

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.

*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



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


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


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)


Roll-Off : 18 dB per octave (3 pole filter)

Frequency : Fixed 75Hz measured at the 3dB down point


W X D X H : 220mm (W) x 104mm (H) x 254 - 290mm

Weight : 3.9 kg (8.6 lbs)

asking $350

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