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Case dimensions are illustrated in the diagram above.

ISA Two requires 1U of vertical rack space. Allow an additional 75mm of rack depth behind the unit 
for cable access. 

ISA Two weighs 3.7 kg and for installations in a fixed environment (eg., a studio rack), the front-
panel rack mountings* will provide adequate support. However, if the unit is to be used in a mobile 
situation (eg., flight-cased for touring, etc.), it is recommended that side support rails or shelves are 
used within the rack.

*Always use M6 bolts and cage nuts specifically designed for 19” equipment racks.  An Internet search using the 
phrase “M6 cage nuts“ will reveal suitable components.

Cooling vents are provided at each side; ensure that when mounted in a rack these vents are 
not obstructed. Do not mount the unit immediately above any other equipment which generates 
significant heat, for example, a power amplifier. 

Note. The maximum operating environmental temperature is 40°C / 104°F.

Power Requirements

ISA Two is mains powered and incorporates a ‘Universal’ power supply which can operate on any AC 
mains voltage from 100 V to 240 V. The AC connection is via a standard 3-pin IEC connector on the 
rear panel. 

A mating IEC cable is supplied with each unit – this should be terminated with a mains plug of the 
correct type for your country.

Power consumption for ISA Two is 35 W.

Please note that there are no fuses or other user-replaceable components of any type in any unit. 
Please refer all servicing issues to the Customer Support Team 

(see “Customer Support and Unit Servicing” 

on page 15).

PHYSICAL CHARACTERISTICS 

465.0mm / 18.3”

325.0mm / 12.8”

31.8mm / 1.25”

Summary of Contents for ISA TWO

Page 1: ...User Guide focusrite com FA0540 03 Two channel classic transformer mic pre...

Page 2: ...ut Impedance 5 Filter 5 Insert 5 Meter Calibration 6 Rear Panel 7 AC Mains Inlet 7 Channel Mic Inputs 7 Channel Line Inputs 7 Channel Outputs 7 Channel Insert Sends Returns 7 Meter Calibration Pot 7 P...

Page 3: ...e ISA Two The ISA Two provides two of Focusrite s prestigious transformer based microphone preamps and can be used to record microphone line level or instrument sources Microphones and line level sour...

Page 4: ...Gain switch is turned to minimum before pressing the 30 60 switch Before starting a recording or if used for PA live work set theTrim control to near its centre position This will allow for some grad...

Page 5: ...impedance options The values are shown in the table For additional information on impedance selection see Appendix 2 Preamp Input Impedance on page 10 With the Instrument input selected pressing the s...

Page 6: ...lt calibration is for 0 to indicate a signal level of 22 dBu Meter Calibration The level at which the 0 LED illuminates can be adjusted using the Peak Meter Calibration pot on the rear panel The defau...

Page 7: ...4 TRS jack sockets Channel Outputs On XLR 3 male connectors Channel Insert Sends Returns Analogue sends and returns on balanced 1 4 TRS jack connectors The insert signal is added into a channel path...

Page 8: ...ounted in a rack these vents are not obstructed Do not mount the unit immediately above any other equipment which generates significant heat for example a power amplifier Note The maximum operating en...

Page 9: ...creen 2 Hot ve 3 Cold ve Pin Signal 1 Screen 2 Hot ve 3 Cold ve Instrument Input Connector Unbalanced TS 1 4 Jack socket Line Input Insert Send Insert Return Connector Balanced TRS 1 4 Jack socket Pin...

Page 10: ...Impedance In Depth Explanation Dynamic Moving Coil and Condenser Microphones Almost all professional dynamic and condenser microphones are designed to have a relatively low nominal output impedance of...

Page 11: ...es an output transformer to convert the low voltage it generates into a signal capable of being amplified by a preamp The transformer uses a ratio of around 1 30 primary secondary to increase the ribb...

Page 12: ...12 Appendices 3 Pro Tools Interfacing Analogue out to Pro Tools HD ISATwo Red 16Line 2 x XLR 3 female DB25 male analogue Pro Tools interface...

Page 13: ...n Z In Low unless otherwise stated RS 50 Measurements taken at the analogue outputs Gain Range 20 to 10 dB in 10 dB steps plus 0 to 20 dB continuous trim Maximum Input Level 25 dBu Input Impedance Ele...

Page 14: ...imensions Height 88mm 3 46 Width 482mm 18 98 Depth 325mm 12 8 Weight Weight 3 70 kg 8 12 lbs Output Level Maximum output level 24 dBu Environmental Operating Temperature 40 C 104 F Maximum ambient ope...

Page 15: ...of the appropriate procedure for resolving the warranty issue In every case it will be necessary to provide a copy of the original invoice or store receipt to the distributor In the event that you ar...

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