Focusrite ISA Two - Microphone Preamp

BH #FOISATWO • MFR #ISA-2
Focusrite
Focusrite ISA Two - Microphone Preamp
Key Features
  • Dual Mono
  • Transformer Based Microphone Inputs
  • Variable Input Impedance
  • Front Panel Instrument Inputs
The ISA Two from Focusrite is a dual mono microphone preamp featuring transformer based microphone inputs with variable input impedance. Based on the legendary designs found in the Focusrite Forte and Studio consoles, the preamps provides up to 80 dB of gain, while two front panel instrument inputs allow for immediate access to two transparent DIs.
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$899.99

Focusrite ISA Two - Microphone Preamp

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Focusrite ISA Two Overview

  • 1Description
  • 2Microphone Input Transformer
  • 3Gain
  • 4Variable Input Impedance
  • 5User-Calibrated Metering
  • 6Instrument and Line Inputs
  • 7Variable High-Pass Filter
  • 8Balanced Inserts

The ISA Two from Focusrite is a dual mono microphone preamp featuring transformer based microphone inputs with variable input impedance. Based on the legendary designs found in the Focusrite Forte and Studio consoles, the preamps provides up to 80 dB of gain, while two front panel instrument inputs allow for immediate access to two transparent DIs.

The microphone inputs feature a pair of Lundahl LL1538 transformers with a 3-section winding that results in very low leakage inductance, along with an extended frequency response. To shield them from stray magnetism, each is encapsulated in mu-metal cans. Each channel has a fully-balanced insert point, activated using a front-panel button, making it easy to insert a choice of outboard EQ, a compressor, or limiter.

Microphone Input Transformer

  • Includes Lundahl LL1538 input transformers, originally chosen by Rupert Neve for the ISA 110 and one of the best microphone input transformers available
  • Zobel network in the ISA circuit (perfected by Rupert Neve) allows the microphone preamp to maintain an extremely flat frequency response across a very wide bandwidth

Gain

  • Offers up to 80 dB of clean, distortion-free gain
  • ISA topology ensures low-noise even at the highest gain levels
  • The transformer supplies 20 dB of gain, while the ISA's input stage offers up to 60 dB of additional gain on the microphone input

Variable Input Impedance

  • Four choices of input impedance, including the original ISA 110 value, allow for matching the preamp to a different microphones, even a vintage type, for the best possible sound
  • Impedance is selected using a switch on the front panel
  • Impedance choice is remembered even when the unit is switched off and back on

User-Calibrated Metering

  • Each channel has an eight-LED array to clearly display the level of the two signals
  • Line up the analog levels with digital converters or a DAW by using the calibration knob on the rear panel
  • Calibration avoids clipping on input

Instrument and Line Inputs

  • Two 1/4" TS connectors on the front panel provide access to a transparent DI input
  • TRS line inputs are available on the rear panel and a front panel switch allows for stepping through them to instantly select required input

Variable High-Pass Filter

  • Smooth-sounding, built-in 18 dB/octave high-pass filter per channel
  • Same design as the original ISA 110 module
  • Ideal for cutting out rumble, thumps and other unwanted low-frequency sounds using the 16 Hz to 420 Hz range
  • Easily accessed with a large knob and illuminated button

Balanced Inserts

  • Each channel has its own balanced insert point via 1/4" TRS send and receive connectors
  • Allows for a choice of signal processor to be connected and switched in and out using the illuminated switch on the front panel
UPC: 815301005148

Focusrite ISA Two Specs

Number of Channels2
Multi FunctionNo
Inputs2 x 1/4" TS phone Instrument (front panel)
2 x XLR Microphone (rear panel)
2 x 1/4" TRS phone Line (rear panel)
2 x 1/4" TRS phone Return (rear panel)
Input ImpedanceMic (@ 1 kHz): Low = 600Ω, ISA 110 = 1.4Ω, Medium = 2.4Ω, High = 6.8 kΩ
Line: 10 kΩ from 10 Hz to 200 kHz
Instrument: >2 MΩ
Maximum Input LevelMic: +7 dBu with a THD+N <0.7% at 1 kHz measured at 0 dB of gain with 150Ω source impedance and 22 Hz to 22 kHz band-pass filter
Outputs2 x XLR
2 x 1/4" TRS phone Send
Maximum Output Level+24 dBu with a THD+N <0.01% at 1 kHz measured with 150Ω source impedance and 22 Hz to 22 kHz band-pass filter
Phantom Power+48V, individually switchable
Gain RangeMic: 0 dB to +60 dB in 10 dB steps, plus 0 dB to +20 dB continuously variable trim
Line: -20 dB to +10 dB in 10 dB steps, plus 0 dB to +20 dB continuously variable trim
Instrument: +10 dB to +40 dB continuously variable trim
Frequency ResponseMic @ minimum gain (0 dB): 10 Hz to 135 kHz, -0.5/1 dB
Mic @ +60 dB gain: 10 Hz to 115 kHz, -6/-1 dB
Line @ unity gain (0 dB): 10 Hz to 80 Hz, -0.3/-1 dB
Instrument @ minimum gain (+10 dB): 10 Hz to 115 kHz, -0.1/1 dB
Instrument @ maximum gain (+40 dB): 10 Hz to 110 kHz, -2.5/1 dB
EIN-127 dB (60 dB of gain with 150Ω source impedance and 22 Hz to 22 kHz band-pass filter)
NoiseMic: -97 dBu @ output with unity gain (0 dB) and 22 Hz to 22 kHz band-pass filter
Line: -97 dBu @ output with unity gain (0 dB), measured with 50Ω source impedance and 22 Hz to 22 kHz band-pass filter
Instrument: -95 dBu, minimum gain (+10 dB) with 22 Hz to 22 kHz band-pass filter
Signal to Noise RatioMic: 121 dB, with +24 dB maximum output (150Ω source impedance and 22 Hz to 22 kHz band-pass filter)
Line: 121 dB, with +24 dB maximum output (50Ω source impedance and 22 Hz to 22 kHz band-pass filter)
THD + NMic: <0.0007% @ 1 kHz (-20 dBu input signal with +30 dB gain and 22 Hz to 22 kHz band-pass filter)
Line: <0.002% @ 1 kHz (0 dBu input signal with +10 dB gain and 22 Hz to 22 kHz band-pass filter)
CMRRMic Input @ 60 Hz: -94 dB, with +24 dBu maximum output
Mic Input @ 10 kHz: -91 dB, with +24 dBu maximum output
CrosstalkMic: -85 dB (I/P = 0 dBu, gain = 0 dB @ 1 kHz input to channel A, channel B output)
Line: -91 dB (I/P = 0 dBu, gain = 0dB @ 1 kHz input to channel A, channel B output)
Power Requirements100~240 VAC, 50/60 Hz
Dimensions (WxDxH)19 x 11 x 1.7" (480 x 280 x 44 mm)
Weight8.2 lb (3.7 kg)
Specialties18 dB per octave (3-pole) high-pass filter, continuously variable from 16 Hz to 420 Hz (-3 dB)
Packaging Info
Package Weight12 lb
Box Dimensions (LxWxH)25.8 x 14.8 x 5.2"
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