Focusrite Pro ISA Two 2-Channel Mic Preamp

Focusrite's ISA Two brings together a totally independent pair of classic ISA microphone preamps from the original ISA 110 module, combining the best of traditional solid-state electronics with the original input transformer specified by Rupert Neve – the Lundahl LL1538.

Each mic pre has the option of mic, line or the front-panel instrument input, with variable input impedance to ensure you are getting the best performance from the source. Up to 60dB of gain is available on the first four-position rotary and gain range switches, with a further +20dB of continuously variable trim, meaning a huge 80dB of gain is available should it be required. The high-pass filter features variable cut-off frequency between 16 and 420Hz. A pair of 8-segment LED meters show peak signal level in dBFS, while a rear-panel pot allows calibration to suit your A-D converters. Rear-panel insert points allow the use of inline processors such as compression.

Focusrite Pro ISA Two Features

• Classic ISA mic preamp design featuring Lundahl LL1538 input transformer
• Front-panel instrument inputs
• Dedicated TRS line input socket with front-panel switch
• Switchable input impedance including classic ISA 110 setting
• Dedicated insert points
• User-calibrated peak-level meters
• 3 Year Warranty

• ISA Two preamp1
• Brainworx bx_console1

• Mic input response
  • Gain range: 0 dB to 60 dB in 10 dB steps, plus 0 dB to 20 dB continuously variable trim
  • EIN: measured at 60 dB of gain with 150 O source impedance and 22 Hz-22 kHz band pass filter -127 dB
  • Noise: Noise at output with unity gain (0 dB) and 22 Hz-22 kHz band pass filter -97 dBu
  • Frequency response: At minimum gain (0 dB)-0.5 dB at 10 Hz,?-1 dB at 135 kHz, relative to 1 kHz
  • At 60 DB gain: -6 dB at 10 Hz, -1 dB at 115 kHz, relative to 1 kHz
• Line input response
  • Gain range: -20 dB to 10 dB in 10 dB steps, plus 0 dB to 20 dB continuously variable trim
  • Input impedance: 10 kO from 10 Hz to 200 kHz
  • Frequency response: At minimum gain (0 dB)-0.3 dB at 10 Hz, -1 dB at 80 kHz, relative to 1 kHz
• High pass filter
  • Roll-off: 18 dB per octave (3 pole filter)
  • Frequency range: continuously variable from 16 Hz to 420 Hz (-3 dB)