![]() I measure (crudely, using a DMM and a 56R resistor) Zout to be close enough to zero as makes no difference and the FR is flat to with 0.1dB 20-20kHz. Plainly the Macbook output is noisy, but not a total disgrace, and the distortion is probably inaudible according to thresholds regularly touted here. I've seen that appear in one or two other measurements - perhaps someone with greater expertise could speculate on the source.Īnyway, here are single frequency distortion plots of Motu unbalanced loopback (which I think demonstrates that the Motu output is not a limiting factor) and Macbook Pro (2015 15" model) out to Motu in. And I've used 900Hz because there is a spike at 8k from the Macbook which appears even with no output and skews the THD measurement. (You may need to scroll down. Open the System Settings app on your Mac. On your Mac, choose Apple menu > System Settings, then click Sound in the sidebar. The Macbook out put is lower than than the Motu so I've trimmed the input gain to compensate. Then, follow the steps below to make sure that your Output settings are correct from your Mac. All the ins and outs I've looked at creep up in distortion above about -10dBFS so I've used that as a reference level. Select the device that you want to use to play sound. This will display a list of devices that can output audio. 3 3 Click the 'Sounds' option and then select the 'Output' tab. I'm using a Motu Ultralite Mk3, which seems to perform pretty decently. If you have multiple audio devices connected to your Mac, it may not switch inputs correctly. Until such time as a grown up can measure it properly, this may give some (amateur) insight.
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