Focusrite ISA One Pre Amplifier

Loading reviews...
Sold out
  • Focusrite ISA One Pre Amplifier - Jamsticks

Focusrite ISA One Pre Amplifier

Loading reviews...
Sold out
Add to Wishlist

Brand Warranty as Applicable, Usually delivered in 2-8 Business days

  • Focusrite ISA One Pre Amplifier

    Product Description

    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)



    18 dB per octave (3 pole filter)


    Fixed 75Hz measured at the 3dB down point


    W X D X H

    220mm (W) x 104mm (H) x 254 - 290mm


    3.9 kg (8.6 lbs)