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What is a Clock Source and Sample Rate?

Applies to: Focusrite Control, Scarlett & Saffire Mix Control

Sample Rate:

A Sample Rate is the number of audio samples carried per second, measured in Hz or kHz (1 kHz being 1,000 Hz). For example 44,100 samples per second can be written as either 44,100 Hz or 44.1 kHz. The higher the Sample Rate, the more samples of audio being carried by the device as well as a higher frequency range being captured, meaning the higher the Sample Rate, the higher the quality of audio being recorded. Standard CD audio format is 44.1 kHz, while to match the frame rate better, the standard Film-Audio format is 48 kHz.

 

Clock Source:

The Clock Source is the synchronization between units and can be visualized as each part of a connection moving data at the same speed. 

Without Clock With Clock
011101001 011101001
111010010 011101001


If only one unit is being used, it's Internal Clock Source should be selected. If multiple pieces of hardware are being connected together via digital means, the Clock Source on one unit must be set to Internal as the "master" while all other units in the chain should be set to the external connection as the "slave". Only one piece of hardware will be able to serve as the host for the connection.

(For example, using a Clarett 8PreX with a Clarett OctoPre, The Clarett 8PreX would be set to ADAT in Focusrite Control and while the Clarett OctoPre would be set to Internal on the physical unit). 

 

For more information on which Clock Source to choose Click Here.

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