Apple Impulse Response Utility - Manual (Page 32)

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Repeat this process twenty-three more times, until you have recorded all twenty-five
audio tracks needed to capture all possible microphone and speaker position
combinations.
Step 5: Deconvolving
Click the Deconvolve button after you have recorded (and checked) the audio files at
each position. At this point, you should manually save the project.
Step 6: Editing and Auditioning
If you have any unwanted silence at the beginning or end of your impulse response,
use the Editing area to remove it. Use the Audition window to play some test material
through your impulse response, to make sure that you’re satisfied with the result. If not,
edit your impulse response further. If you still aren’t satisfied, go back to step two or
three, and start over.
Step 7: Creating a Space Designer Setting
Once you are fully satisfied with your impulse response, you’re ready to click on Create
Space Designer Setting. Impulse Response Utility generates the .sdir and
Space Designer settings files. Your new impulse response will be available the next time
you open Space Designer.
This basic workflow is the same, regardless of impulse response format or approach to
microphone and speaker placement. That’s all there is to it!
Recording a Mono to Omni 5 Channel Impulse Response
The above is an example of recording a true surround impulse response. In many cases,
it is sufficient to record one speaker position, thus creating a mono/omni discrete
impulse response. Mono/omni discrete impulse responses are not only easier and faster
to record, but also place a lower strain on the CPU.
To create a mono to Omni 5 Channel impulse response:
1 Choose the Mono/Omni to 5 channel template in the New Projects dialog.
You will see that mono/omni discrete projects only require one speaker.
2 Aim your speaker towards the ceiling or a back-wall.
3 Point your microphone to the first surround position: Front-Left, for example.
4 Record the sweep.
5 Repeat the process for all remaining microphone positions.