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Focusrite ISA One Single Channel Microphone Preamp


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The ISA One Mic Pre is designed from Focusrite's classic, transformer-based Forte console in a rugged and portable chassis. The groundbreaking price is guaranteed to be the lowest at Sam Ash, where you'll also get fast, free delivery.

The Focusrite ISA One is a microphone preamp derived from the best that Focusrite has to offer. Renowned for their superior, ISA transformer-based design, the ISA One finally brings the ultimate in flexibility, performance and affordability to musicians of all levels. Its tone can be described as transparent and uncluttered with a very broad frequency response. And, there are several reasons why it's considered flexible...It's a simple solution for guitarists, vocalists and engineers as it has an independent DI (direct input) channel. There are four selectable variable impedance settings allowing you to get the best possible match or "happy accident" mismatch from your microphones. Its elegant VU meter has a variable configuration for both digital and analog recording mediums and is even calibrated to match the reference points of Pro Tools HD. Finally, there's even a convenient insert point which allows you to add extra processing within the signal chain if required.

For anyone who's ever dreamed about getting a true Focusrite mic pre based on their legendary console designs, it's never been more affordable.

  • ISA series transformer-based preamplifier
  • Flexible D.I. channel with independent outputs & gain controls
  • Choose from four input impedances, including the original ISA110 setting
  • Sum two inputs to the headphones output, or an external stereo cue mix
  • Dedicated insert point
  • Optional stereo 192kHz A-D converter

  • Mic Gain range of 60dB
  • Variable impedance of 600 ohms, ISA 1400 ohms, 2400 ohms, 6800 ohms
  • High-pass filter
  • XLR Mic input
  • XLR Line input
  • Instrument input 1/4" TRS
  • 1/4" TRS send
  • XLR output
  • XLR DI output and TS thru

Things You Will Get:

  • Microphone Preamp
  • Manual
  • Power Cable


by PowerReviews
Focusrite Isa One Single Channel Microphone Preamp

(based on 1 review)

Reviewed by 1 customer

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(1 of 1 customers found this review helpful)


The breaking point


from Sanford, NC

About Me Experienced

Verified Reviewer


  • Clear Sound
  • Easy To Use
  • Powerful
  • Professional Functions
  • Versatile


    Best Uses

    • Home Studio
    • Performances
    • Professional Recording

    Comments about Focusrite Isa One Single Channel Microphone Preamp:

    This thing is amazing at this price point. If this is what pro audio sounds like, then I am hooked. After upgrading to a Joemeek ThreeQ a few months ago for vocals I was still not satisfied with the results. I went back in to get a better preamp. I grabbed the ISA One and man there is a night and day difference in audio quality. The ThreeQ has edgy and crunchy highs and a small bottom end. The ISA One has silky highs and a fat and full bottom. I have met the breaking point between amateur and professional vocals.

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    Preamp Type Solid-State
    Channels 2
    Gain Mic 60dB
    DI 40dB
    Frequency Response 10Hz-125kHz
    EQ No
    Compressor No
    Phantom Power Yes
    Analog Inputs Number 4
    Analog Input Types (2) XLR
    (2) 1/4" TRS
    Analog Outputs Number 4
    Analog Outputs Types (2) XLR
    (1) 1/4" TRS
    (1) 1/4" TS thru
    Digital Inputs N/A
    Digital Input Type N/A
    Digital Outputs N/A
    Digital Output Type N/A
    Other Controllers Impedance switching 600, 1400, 2400, 6800 ohms
    Phase Invert
    75Hz 18dB high-pass filter
    Computer Connectivity N/A
    Dimensions 8.66" x 4.1" x 11.4" (W x H x D)
    Weight 8.6 lbs.
    Model ISA One


    Warranty Info:

    ISA One Single Channel Microphone Preamp

    The manufacturer's warranty covers parts for one year and labor for one year from date of purchase. The warranty excludes damage from misuse, abuse, and contains other exclusions.