Focusrite Saffire PRO 40, User Manual

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S/PDIF AC3
Allows the user to stream AC3 directly via the S/PDIF outputs. (AC3 is encoded 5.1 audio, e.g. from a DVD player, that will be sent via
S/PDIF cable (RCA or Optical) to your 5.1 decoder.)
Please note: The Saffire PRO 40 is not an AC3 encoder/decoder and the signal must be output from your audio software as an
encoded AC3 signal to be decoded by an AC3 receiver.
Active Monitor Pad
When ticked, this drops the level of monitors 1 and 2 by 20dB.
This is recommended for set-ups using a stereo pair of Active Monitors.
If you find that for normal listening levels, the Volume monitor knob has to be set at only e.g. 3 or 4, then tick ‘Active Monitor Pad’ and
the volume monitor knob should now be at 6 or 7, thus giving you better control of the output volume level.
FireWire Driver Latency
The Saffire PRO 40s latency performance will be dictated by the Core Audio buffer size specified in your DAW (Mac,) or as set in the
ASIO buffer size (Windows.) The Firewire Driver Latency affects the performance of the Core Audio or ASIO buffer settings.
If you are experiencing clicks and pops or audio dropouts, this may be due to certain hardware in your computer that is affecting
the performance of audio devices connected via FireWire. Rather than removing and replacing hardware (e.g. your graphics card or
wireless internet card) trying a longer Firewire Driver Latency setting may solve the problem.
ASIO Buffer Size
Set the buffer size of your ASIO driver here.
A small buffer size will in result in lower latency at the expense of increased CPU usage.
A high buffer size will result in a higher latency but with lower CPU usage.
If you are using lots of virtual instruments and effects processing in your DAW project, and the CPU usage is high, then increase
the buffer size to permit lower CPU usage.