Focusrite ISA Two microphone preamplifier

‌Focusrite ISA Two 2-channel microphone preamplifier

ISA TWO

Two Channels Of Classic Focusrite Mic Pres

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.

• 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

Specsifications:

Mic input response

• Gain Range (Mic): 0 dB to 60 dB in 10 dB steps, plus 0 dB to 20 dB continuously variable trim
  
• EIN (Mic): Measured at 60 dB of gain with 150 O source impedance and 22 Hz-22 kHz band pass filter -127 dB
  
• Noise (Mic): Noise at output with unity gain (0 dB) and 22 Hz-22 kHz band pass filter -97 dBu
  
• Frequency Response (Mic): At minimum gain (0 dB)-0.5 dB at 10 Hz,?-1 dB at 135 kHz, relative to 1 kHz
  
• At 60 DB Gain (Mic): -6 dB at 10 Hz, -1 dB at 115 kHz, relative to 1 kHz
  
• Crosstalk Channel To Channel (Mic): Mic input, with I/P = 0 dBu, gain = 0 dB @ 1 kHz input to channel A, channel B output = -85 dB

Line input response

• Gain Range (Line): -20 dB to 10 dB in 10 dB steps, plus 0 dB to 20 dB continuously variable trim
  
• Input Impedance (Line): 10 kO from 10 Hz to 200 kHz
  
• Frequency Response (Line): At minimum gain (0 dB)-0.3 dB at 10 Hz, -1 dB at 80 kHz, relative to 1 kHz
  
• Crosstalk Channel To Channel (Line): Line input, with I/P = 0 dBu, gain = 0dB @ 1 kHz input to channel AChannel B output?= -91 dB

Instrument input response

• Gain Range (Instrument): 10 dB to 40 dB continuously variable trim
  
• Input Impedance (Instrument): 2 MO
  
• Noise (Instrument): Measured with 22 Hz-22 kHz band pass filterMinimum gain ( 10 dB) = -95 dB
  
• Frequency Response (Instrument): At minimum gain ( 10 dB)-0.1 dB at 10 Hz,?-1 dB at 115 kHz, relative to 1 kHz
  
• At Maximum Gain ( 40 DB) (Instrument): -2.5 dB at 10 Hz, ?-1 dB at 110 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)

• Dimensions: 480 mm x 280 mm x 44 mm
  
• Weight 3.7 kg

Package includes:

• ‌Focusrite ISA Two 2-channel microphone preamplifier x1