Focusrite ISA Two

2-channel Mic/Instrument Preamp with 80dB of Gain, Switchable Phantom Power, Variable Hi-pass Filters, and Variable Input Impedance
Focusrite ISA Two image 1
Focusrite ISA Two image 1
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Focusrite ISA Two
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Transparency + Warmth = ISA Two

The Focusrite ISA Two mic preamp gives you the sonic essence of the legendary Forte and Studio consoles in a single rack unit chassis. You get two channels, with inputs for microphone, line-level, and direct instrument-level sources. A variable impedance selector also lets you dial in the warmth you want without sacrificing clarity. The ISA Two's DI and microphone inputs run in parallel, so you can blend the direct signal of the instrument with the sound of the miked up amplifier - a killer trick for getting bass sounds that are both fat and punchy. If warmth, transparency, and useful features are on your preamp wishlist, check out the Focusrite ISA Two.

Focusrite ISA Two Dual-mono Mic Preamp at a Glance:
  • The Focusrite magic: warmth plus transparency
  • Engineering it right
  • The Neve connection
The Focusrite magic: warmth plus transparency

Focusrite's ISA Two mic preamp has a distinguished heritage. Since its 1985 introduction, the transformer-based Focusrite pre amp has become something of a legend - and a benchmark for transparency. But there's something else going on. That something is a subtle warmth, courtesy of transformer core saturation. It's this apparent contradiction of warmth plus transparently open and unrestricted high frequencies, that identifies the Focusrite "sound" that continues to be in demand in top studios worldwide.

Engineering it right

The Focusrite ISA Two has some innovative thinking under its bonnet. Just what engineering innovations contribute to a superior-sounding mic preamp? For one thing, to eliminate the audible rolloff exhibited by preamps limited to the audible bandwidth, Focusrite ISA pres operate over a much greater range (10Hz-135kHz, in the case of the ISA Two). There's also the ISA topology that gives you up to 80dB of undistorted gain. How about variable input impedance, which lets you fine-tune the amount of "character" in your signal - from pristine transparency, to vintage warmth.

The Neve connection

Rupert Neve selected the Lundahl LL1538 as the input transformer for the legendary Focusrite ISA 110, and it's still the best microphone input transformer available - Focusrite specifies it in every one of their ISA Series mic pres. Mr. Neve also perfected the Zobel network (found in Focusrite's ISA circuit), which is responsible for the broad-bandwidth, ruler-flat frequency response exhibited by ISA preamps.

Focusrite ISA Two Dual-mono Mic Preamp Features:
  • Two channels of Focusrite goodness in a rackspace!
  • Lundahl LL1538 mic input transformer
  • Up to 80dB of gain
  • Variable input impedance
  • User-calibrated metering
  • Front-panel instrument and rear panel line inputs
  • Variable cut-off highpass filter
  • Rear panel balanced inserts
Your studio needs a pair of superb preamps - get 'em in the Focusrite ISA Two!

Additional Media

ISA Two User Manual
Studio Preamp Buying Guide

Tech Specs

Preamp Type Solid State
Number of Channels 2
Frequency Response 10Hz-135kHz
Phantom Power Yes
Analog Inputs 2 x XLR, 2 x TS (inst), 2 x TRS (line), 2 x TRS (Return)
Analog Outputs 2 x XLR, 2 x TRS (Send)
Rack Spaces 1U
Height 1.75"
Depth 11"
Width 19"
Weight 8.16 lbs.
Manufacturer Part Number ISA Two

Customer Reviews

Based on 17 reviews
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I am so happy with the Focusrite ISA Two. I really did my home work before buying this preamp. It can really get frustrating trying to find the right preamp at a great price and the Focusrite exceeded my expectations. It doesn't leave anything behind and has a really natural sound with just a pinch of sweetness. I am looking at adding another to my rig. Sounds great on everything. After owning it I have to say it's a no brainer.
Music background: Composer,Producer,Studio and Live Engineer


my drums came alive , super sound warm, tone , all amazing
Music background: recording studio

fucusrite isa two

I have been using this preamp for about a year it is by far one of the cleanest and also very studio friendly in terms of ease of use I've come across, it just sounds really good on everything. also the price point is not bad here you will get more for what you payed for. thanks carson m
Music background: guitar,song writer etc

ISA Two stands it,s ground!

I have mic preamps that cost well over twice of what this one cost, but they don,t sound right on my voice for vocals. They are too colored! And, I wanted a cleaner, but not sterile sounding dual mono mic preamp for acoustic guitar and keyboards, etc. So I read a ton of reviews online, and liked what I read and decided to try this. So I called my sales engineer Matt Adams, and he said that I couldn,t go wrong, and he was right! The ISA Two, is perfect for my voice and sounds outstanding on acoustic guitar, and will work on any instrument, but what I really like is the variable impedance, high pass filter, and 80db of clean gain for ribbon and dynamic mics. And, it holds it own ground with other highend mic pres as well! A great value for sure. Thanks, Matt!
Music background: Musician, Home Studio, and Student of Music

ISA Two is the One!

I owned the ISA One first and was so impressed by the quality and value ratio of the product. (clean & quiet.), that I decided to add two more channels of quality preamps....hence, the ISA Two. Love these preamps. Great service, too. As always.
Music background: Musician
See also: Focusrite, Focusrite Preamps