Bedienungsanleitung Lynx Aurora LT-TB (Seite 13 von 55) (Englisch)

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hardware. If one wishes to avoid the effects of this rate conversion, the sample rate can be

changed globally from the Sound section of Windows control panel (Sound > Properties >

Advanced). After changing the sample rate, the play application often will need to be

restarted.

In OS X, some Core Audio applications will initiate a change of sample rate to match the

project or audio file being played, and others will not. For the most part, professional audio

recording software does request sample rate changes, and consumer or media playback

software does not. Examples of the former would be Logic, ProTools, Cubase, Digital

Performer, etc. Examples of the latter would be iTunes, DVD playback software or

Quicktime.

When the application does not request a sample rate change, and one wishes to avoid sample

rate conversion, the sample rate can be changed from within Audio MIDI setup in OS X to

match the desired sample rate. After changing the sample rate, the play application often will

need to be restarted.

5.2.2 Using External / AES A / AES B Clock

The Aurora can slave to a master/house clock source via Word clock or via its AES inputs. In

this state, it is also important to verify that the clock source is operating at the same sample

rate as the audio being played, no matter what driver model is being used by the LT-TB. See

the Aurora manual for more information about these SYNC SOURCE choices.

5.2.3 Using LSLOT Clock

When an LT-TB-equipped Aurora is used with a computer, it is not possible to have the

Aurora slave to the computer’s Thunderbolt port. Therefore LSLOT is not a valid SYNC

SOURCE option.

5.2.4 Using Multiple Auroras

Whenever multiple Auroras are used in a Thunderbolt daisy-chain, it is critical that clock

synchronicity is achieved. In the vast majority of cases we would recommend one of the

following clock schemes:

- Use a master clock with multiple clock outputs, ideally as many outputs as there are

Auroras in the chain, and connect each Aurora to a unique word clock connection. In

this case, ALL of the Auroras should be set to “EXT” as the SYNC SOURCE. In this

state, it is important to set the Sample Rate on your clock master, to match the sample

rate of your audio file or audio project.

- Use Aurora #1 in the chain, and have the other units slave in a clock daisy chain.

Connect a word clock cable from the WORD CLOCK OUT of unit #1, to Clock IN of

unit #2, Clock OUT from Unit #2 to Clock IN of Unit #3, etc. Set unit number one to

“INT” as the SYNC SOURCE and all of the other units to “EXT”. In this state, the

system should respond to sample rate changes within the computer automatically.

NOTE: When 3 or more Auroras are used in a single system, some form of clock distribution

is recommended to insure phase coherence of the clock signal.

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