Focusrite ISA One Desktop Mic Preamp

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Pro Audio Design
Hanover, MA, United States
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About This Listing

The Focusrite ISA ONE is a single-channel preamp featuring the original ISA design, Lundahl LL1538 input transformer, switchable input impedance including classic ISA 110 setting, variable high-pass filter, independent instrument input, and LED peak meter.
The Focusrite ISA ONE gives you one channel of the console preamp designed for George Martin’s AIR Studios, with modern performance enhancements. The ISA ONE retains the classic ISA sound, which in part, comes from its Lundahl LL1538 input transformer and custom Zobel network, which imparts a special character to the sound that can't be truly emulated in any other way. Whereas the original ISA input impedance was calculated to suit the microphones of the day, today's model makes one small change, adding three additional input impedances to the classic ISA 110 setting, allowing you to match any microphone, vintage or modern, and access a wide range of sounds. The ISA ONE also features an independent instrument DI, which gives you the flexibility of simultaneous instrument and vocal recording. You can also use the ISA ONE as a DAW front end with zero-latency monitoring with the optional A-D card, offering up to 24-bit/192kHz sampling via ADAT or AES3.
Focusrite ISA ONE—Just the Facts

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

Focusrite ISA ONE—Under the Hood
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 ONE is the Lundahl input transformer, which is essentially the same circuit as the original ISA 110, 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. 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.

Product Specs

ConditionBrand New (New)
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