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Summary of Contents for Focusrite ISA428 MkII
- Page 1 ISA428 MkII Four channel mic pre and optional A-D card with Dante User Guide focusrite.com FA0438-03...
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Page 2: Table Of Contents
........... . . Focusrite Pro Warranty and Service... -
Page 3: About This User Guide
Mic pre to be added to a Dante network. If you feel that additional information might be of assistance, be sure to consult the site: pro.focusrite.com/technical-support, which contains a comprehensive collection of common technical support queries. Pro Tools® and Pro Tools | HD are trademarks or registered trademarks of Avid Technology, Inc. -
Page 4: Introduction
LED metering is provided on each channel in dBFS, to indicate when the level is reaching the digital clipping point. To maintain pristine Focusrite quality in the digital domain, an Analogue-to-Digital interface card may be fitted into the option slot on the rear panel. This provides access to a Dante network and features AES3, S/PDIF and ADAT signals. -
Page 5: Isa 428 Mkii Controls And Features
ISA 428 MKII CONTROLS AND FEATURES Front Panel Input channels meters A-D option card: Instrument Power clock and sync inputs switch selection Input Channel Controls Selects the high (30-60 dB) mic Z In selects the input impedance for gain range for the Gain switch the Mic and Instrument inputs Applies +48V phantom power to the 10 dB stepped Mic/Line Gain switch... -
Page 6: Instrument Input
Channel Controls... Instrument Input The Instrument inputs are accessed via standard 1/4” mono jacks on the front panel. The level is set using the Trim control only and is continuously adjustable from +10 dB to +40 dB. Refer to the appendix on page 11 for connector pinouts. Z In (Input Impedance) With Mic input selected, pressing the Z In button steps through the four 600 Ω... -
Page 7: Channel Meters
Channel Meters The front panel LED meter groups 1–4 and 5–8 display the audio level at two different locations: • Meters 1–4 display the signal level at the channel outputs. The channel outputs are also routed to inputs 1-4 of the A-D option card. •... -
Page 8: Rear Panel
Rear Panel Slot for A-D A-D external Line inputs Mic inputs option card inputs 5-8 Mains Insert Sends Channel inlet & Returns Outputs AC Mains Inlet Standard IEC receptacle for AC mains. ISA 428 MkII features a ‘Universal’ PSU, enabling it to operate on any supply voltage between 100 V and 240 V AC. -
Page 9: A-D Option Card
A-D Option Card The optional ISA ADN8 A-D card can be retrofitted to an ISA 428 MkII at any time. Engineering experience is not required as the card can easily be installed by the user. Note that the ISA 428 MkII does not support the earlier ISA 8-Channel A-D card. Once fitted, configuration of the card is carried out over the network using either RedNet Control or the Dante Controller software application. -
Page 10: Physical Characteristics
PHYSICAL CHARACTERISTICS 325.0mm / 12.8” 465.0mm / 18.3” 63.6mm / 2.5” Case dimensions are illustrated in the diagram above. ISA 428 MkII requires 2U of vertical rack space. Allow an additional 75mm of rack depth behind the unit to allow for cables. ISA 428 MkII weighs 7.05 kg and for installations in a fixed environment (eg., a studio rack), the front-panel rack mountings* will provide adequate support. -
Page 11: Appendices
APPENDICES 1. Connector Pinouts Mic Input / A-D Input Signal Connector: XLR-3 female Screen Hot (+ve) Cold (–ve) Output Signal Connector: XLR-3 male Screen Hot (+ve) Cold (–ve) Line Input / Insert Send / Insert Return Signal Connector: Balanced (TRS) 1/4” Jack socket Hot (+ve) Ring Cold (–ve) - Page 12 1. Connector Pinouts... ISA ADN8 Option Card: AES3 Outputs Signal Connector: DB25 female (AES59 digital) Out channels 7/8 Out channels 7/8 – Ground Out channels 5/6 Out channels 5/6 – Ground Out channels 3/4 Out channels 3/4 – Screw binding-posts use the standard UNC 4/40 thread Ground Out channels 1/2 Inputs pins are not used...
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Page 13: Preamp Input Impedance
Appendices... 2. Preamp Input Impedance A major element of the sound of a mic pre is related to the interaction between the specific microphone being used and the type of mic preamp interface technology it is connected to. The main area in which this interaction has an effect is the level and frequency response of the microphone, as follows: Level Professional microphones tend to have low output impedances and so more level can be achieved by... - Page 14 2. Pre Amp Impedance... To minimise microphone loading, and to maximise signal to noise ratio, preamps have traditionally been designed to have an input impedance about ten times greater than the average microphone, around 1.2 kΩ to 2 kΩ. (The original ISA 110 preamp design followed this convention and has an input impedance of 1.4 kΩ...
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Page 15: Pro Tools Interfacing
Appendices... 3. Pro Tools Interfacing • Analogue out to Pro Tools | HD ISA 428 MkII 4 x XLR-3 female – DB25 male analogue Red 16Line Pro Tools interface • Dante to Pro Tools | HD Inputs to Channels ch. 5 – 8 1 –... -
Page 16: Performance And Specifications
PERFORMANCE AND SPECIFICATIONS Microphone Inputs All measurements taken at minimum gain, Z In: medium, unless otherwise stated. Measurements taken at the analogue outputs 0 to 30 dB or 30 to 60 dB (with ‘30-60’ switch enabled), in 10 dB steps, Gain Range plus 0 to 20 dB of continuous trim +7 dBu... - Page 17 Performance and Specifications . . . Connectivity Front panel Instrument inputs 4 x 1/4” mono jack Rear Panel Microphone inputs 4 x XLR-3 female Line level inputs 4 x 1/4” balanced jack Line level outputs 4 x XLR-3 male Insert sends 4 x 1/4”...
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Page 18: Focusrite Pro Warranty And Service
In the event of a Manufacturing Defect becoming evident in a product within 36 months from the date of the original purchase Focusrite will ensure that the product is repaired or replaced free of charge. A Manufacturing Defect is defined as a defect in the performance of the product as described and published by Focusrite.
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