Mac USB Audio: M-Audio Says Avoid the Left-hand USB Port, All Ports Not Equal
Is your MacBook Pro a rightie?
Something’s going on with the one or two left-hand USB ports on all MacBook Pros. I’ve heard some issues with hard disks, and now some problems with audio. (Controllers are evidently just fine.) The solution: use the right-hand USB port for audio instead.
Updated: Reader Adam suggests that this is probably due to a difference in power delivered to the respective ports. USB audio requires more power, and so odds are you’re under-delivering on the left-hand ports. I’m inclined to think that this is exactly what’s going on – unless someone knows something else. (Easy way to test: try plugging in the power adapter. Note that this can be an issue with FireWire, too.)
In fact, even if for some reason M-Audio has found another reason behind this, Andy Ihnatko noted the issue with different USB ports and power variation way back in 2008. It affects non-Pro MacBooks, and I expect likely many PCs, too.
The MacBook. All USB Ports Are Not Equal [Wired Gadget Lab]
M-Audio (now Avid) has gone as far as to tell its customers officially to avoid the use of that port for audio entirely. Native Instruments forum users have evidently had similar discussions. Via matt_bot on Twitter:
/* Buy links if custom fields not null and not in cat or search results */ ?> /* End Buy links if custom fields not null and not in cat or search results */ ?>The use of USB Audio Devices on the Left-Hand USB Port Is Not Recommended. This applies to ALL MacBook Pro Models (Core Duo and Core 2 Duo).
• The 15" MacBook Pro models have 1 USB port on the left side, and one USB port on the right side.
• The 17" MacBook Pro models have 2 USB ports on the left side, and one USB port on the right side.













