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Focusrite ISA One Single Channel Microphone Preamp (Open Box)


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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
Encased in a rugged and portable chassis, ISA One offers the classic Focusrite microphone preamplifier at its lowest cost to date.

Flexible independent D.I. 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 mix 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 D.I. 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 (dynamic range of 118dB). Alternatively, the ISA One Digital comes with the A-D converter as standard.


  • 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
Channels 2
Gain Mic 60dB
DI 40dB
Frequency Response 10Hz-125kHz
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
Other Controllers Impedance switching 600, 1400, 2400, 6800 ohms
Phase Invert
75Hz 18dB high-pass filter
Dimensions 8.66" x 4.1" x 11.4" (W x H x D)
Weight 8.6 lbs.
Model ISA One


Warranty Info:

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.