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INTRODUCTION
Thank you for purchasing the Focusrite ISA One.
The ISA One is a high quality transformer microphone preamplifier which can be used to record
microphone, line-level or instrument sources. Microphone and line-level sources are connected to
the rear panel, whilst an independent instrument input can be plugged directly into the front panel
jack socket. A local amp or combo can also be connected to the front Amp output jack.
The front panel provides independent mic/line and instrument gain controls; settings for phantom
power, phase and impedances for the mic and instrument inputs. The headphone output, with
independent level control, can monitor either the selected channel signal or the stereo Cue input on
the rear panel.
A traditional moving-coil VU and LED peak meters are provided, both with a trim control on the rear
panel for calibration. The second LED peak meter indicates the level at the instrument DI or, when
connected, the external input.
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.
Once the A-D card is installed, the internal/external clock sample rate and sync source can be
selected using the switches on the front panel.
