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Focusrite ISA-ONE Professional Mic Preamplifier

Item #68032
List: $799.99
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USD$499.99
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Focusrite ISA-ONE Professional Mic Preamplifier

The ISA One microphone preamplifier delivers Focusrite's prestigious ISA transformer-based preamp in a rugged and portable chassis, at a groundbreaking price.

ISA One features the classic vintage microphone preamplifier topology from the original ISA110 module, which formed the cornerstone of each channel of Focusrite's legendary Forté console.

The preamp is complemented by a line input and an independent D.I. channel, complete with dedicated gain control, active or passive impedance switch, a TRS Jack output for routing to an amp and an independent XLR output on the rear. This flexible independent D.I. makes the ISA One ideal both for engineers wishing to blend a D.I.’d guitar signal with a mic’d guitar cabinet, and for demanding performers who require a single classic solution for both guitar and vocals.

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).

Specifications

We always quote 'real world' performance figures (measured to the AES17 standard). Some companies choose to quote chipset performance, which is misleading.

Mic Input Response
  • Gain range = 0dB to 60dB in 10dB steps + 20 dB of variable gain
  • Input Impedance, variable as follows:
  • (Switched Impedance setting Equivalent Input Impedance at 1kHz)
  • Low = 600 Ohms
  • ISA110 = 1400 Ohms
  • Med = 2400 Ohms
  • High = 6800 Ohms
  • EIN (equivalent input noise) = -126dB measured at 60dB of gain with 150 Ohm terminating impedance and 22Hz/22kHz band-pass filter
  • Noise at main output with gain at unity (0dB) = -97dBu measured with a 22Hz/22kHz band-pass filter
  • Signal to noise ratio relative to max headroom (9dBu) = 106dB
  • THD at medium gain (30dB) = 0.0009% measured with a 1kHz -20dBu input signal and with a 22Hz/22kHz band-pass filter
  • Frequency response at minimum gain (0dB) = -0.5dB down at 10Hz and -3dB down at 125kHz
  • Frequency response at maximum gain (60dB) = -3dB down at 16Hz and -3dB down 118kHz
  • CMRR=98dB (Channel 1, 1kHz, maximum gain with +24 dBu input)
  • Crosstalk Channel to Channel: with 10dB@1kHz input to chA, chB output =104dBrA. With 10dB@10kHz input to chA, chB output = 84dBrA
Line Input Response
  • Gain range = -20dB to +10dB in 10dB steps + 20 dB of variable gain
  • Input Impedance = 10k? from 10Hz to 200kHz
  • Noise at main output with gain at unity (0dB) = -96dBu measured with a 22Hz/22kHz band-pass filter
  • Signal to noise ratio relative to max headroom (24dBu)=120dB
  • Signal to noise ratio relative to 0dBFS (+22dBu) = 118dB\
  • THD at unity gain (0dB) = 0

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