Listen AmpConnect621, User Manual

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10 Hardware and Calibration AmpConnect 621
™
Manual
Hardware Editor
The sample rate for AmpConnect 621 is set to 44.1kHz by default. Click on the drop-down arrow in the
Default Sample Rate column and select from the available rates. This will update all input and output
sample rate fields for the device.
Latency - The Latency value for each sample rate is preset for AmpConnect 621. Generally these values
should not need to be adjusted. For default Latency values see the tables on page 12 .
Latency is the round trip time delay between input and output channels on a single audio interface when
operating in full-duplex mode (record and play simultaneously). Consistent latency is essential for sample
accurate measurements such as Absolute Phase. Refer to the SoundCheck Manual > Hardware
Configuration > Latency Adjustment.
The following process should be followed if you find that latency is slightly
different than the default hardware step included with SoundCheck. This could
be due to differences in motherboard or driver version.
1. Open the Hardware Editor. Since Latency is Sample Rate dependent,
click on the Default Sample Rate drop down to select the desired rate.
2. Click on the drop down arrow next to the value in the Latency field of the
Hardware Editor. Select Edit and the Latency Table will open.
3. Set the Latency for the desired sample rate to 0 (zero) and click OK.
4. Make sure the sample rate of the audio interface has updated. Change the
ASIO Buffer/USB Streaming mode for the audio interface in the ASIO
Control Panel (if applicable). Typically there is no buffer control for WDM /
WASAPI.
5. Run the Self Test sequence from the Calibration folder in SoundCheck.
This will give you the Latency for the new Buffer size or Sample Rate.
(Some audio interfaces may require “fine tuning” of the Latency value by
following Step 5 and then repeating Step 4.)
6. Enter this value in the Latency field of the Hardware Editor Sample Rate/Latency Table. Repeat this
process for other required Sample Rates.
Figure 4-3: Hardware Editor - Audio Tab
Figure 4-4: Sampling
Rate
Figure 4-5: Edit
Latencies Table