Focusrite - ISA One - Analog Microphone Preamp

| UPC # 815301005100
Our Price: $499.99
Retail: $799.99 | You Save: 37%
*****5 / 5 (based on 2 Reviews)
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The ISA Range from Focusrite, based on Rupert Neve’s original designs for Sir George Martin’s AIR Studios back in 1985, puts the renowned Heritage Sound of Focusrite into your own studio or live performance. Featuring a rugged, portable all-metal enclosure, the ISA One combines the classic Focusrite transformer-input microphone preamp with a flexible, independent DI channel and optional 192kHz precision A/D conversion.


  • ISA series transformer-based preamplifier - Encased in a rugged and portable chassis, ISA One offers the classic Focusrite microphone preamplifier in a highly cost-effective and flexible package.
  • Flexible, independent DI channel - ISA One is ideal for both engineers and demanding performers alike, featuring independent gain control, an output for routing to an amp, an independent XLR output on the rear and routing to the optional A-D converter.
  • Switchable impedance - Choose one of four carefully selected input impedances, including the original ISA110 setting, to suit any microphone.
  • Headphone output with volume control - ISA One can feed either a sum of the two inputs to the headphones output, or an external stereo cue mix (such as a stereo feed from an interface) via two TRS jack inputs on the rear of the unit.
  • Dedicated insert point - Allows you to place extra processing between the preamplifier or DI and the optional converter, such as an EQ or compressor.
  • Optional stereo 192kHz A-D converter - You can choose to upgrade your unit with an optional digital card that delivers the best A-D performance in its class, with a dynamic range of 1 18dB.
  • Lundahl LL1538 Input Transformer - The original mic transformer used in the original Red modules helps to provide the unique sound and performance of this groundbreaking design.
  • Backlit VU meter with variable calibration - ISA One has a moving coil VU meter with variable calibration to suit analogue and digital recording media, alongside two six-LED peak meters; inputs can be metered either pre- or post-insert.
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Product Reviews
  • *****
  • One of the Best one channel Mic pres!
  • December 06, 2014
  • By: Gary

If you are looking for one pro mic pre to add to your setup then this is the one! Vocals sound great through this pre! Very clean and full sounding. It even makes the best out of lower end mics like MXL or AKG.

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  • *****
  • Can't be beat for the price
  • February 16, 2012
  • By: bilalshabazz

This is a transformer design mic pre, which means it tends to saturate nicely in the low frequencies and give a unique color to the sounds. There is loads of gain in this unit, and it has separate DI gain and output, which makes it really effective for tracking bass. If you are looking for a touch of color with out the noise floor issues of cheap tube pres look no further.

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Product Warranty Information

Tel: (866) 362-8774; Email:; Focusrite Website | Website Contact | Warranty Info; 1 year Parts and Labor


All instruments in our catalogs and on our shopping site carry the manufacturers' warranties against defects in parts and workmanship. Should a defect occur within the manufacturer's warranty period, contact us immediately.

We will be glad to help facilitate the repair or replacement as specified by the manufacturer. The manufacturer will determine whether the defect is covered under their warranty; we do not make that determination.

Please note: U.S.-based manufacturers WILL NOT honor warranties for items sold and shipped outside the U.S. Also, if a school, school district, or board of education purchases an instrument and resells it to an individual, the manufacturer considers the warranty to be void. Warranties are extended only to the original purchaser!

All warranties, stated or implied are held with the product manufacturer and they vary from item to item. Consult the documentation that came with your product for details in addition to the information below.
Focusrite was established in 1985 and the founding principles of the company were to develop products that sounded more musical, in addition to just measuring well. Based just outside of London, they work with the best design talent throughout the world.