Ubuntu: Crackling and feedback with Presonus AudioBox USB on 12.04



Question:

I'm using the Presonus AudioBox USB with the packaged microphone and headphones (AudioBox Studio Bundle with M7 High-Definition Condenser Microphone and HD7 Professional Monitoring Headphones).

I get a lot of feedback and loud crackle in my headphones during audio playback after about 10-20 seconds. It seems to happen at points in songs where the music suddenly becomes louder or the bass becomes more prevalent.

I checked connections and the same setup works fine in Windows 7. If there is any kind of tweaking I can do with my settings to fix this problem please let me know.

Thanks, MD


Solution:1

I have a similar problem with the Presonus Audiobox 1818. With Ubuntu 12.10 I had the issue appear often, but turning the card off and on (often a few times) would eventually fix it. With Ubuntu 13.04 I found no way of doing this. I installed Ubuntu 12.04.2 and it seems to work well all the time. I don't know exactly what the problem is with later versions.

Other things which may be affecting the behaviour of your card:

  • In Ivy Bridge machines, try using a USB 2.0 port, if available, instead of a USB 3.0 port. Your computer may have an option in the BIOS to switch the ports to USB 2.0 compatibility mode, which should do the trick too.
  • There are reports of Wi-Fi cards and other USB devices causing crackling in USB audio devices, so you may want to disable them temporarily to diagnose the problem.
  • There are reports that disabling Pulseaudio may work around crackling problems with USB audio.
  • Some bits of the set-up for real-time sound recording may be applicable here.

As for the driver stuff you mention in the comments: the Audiobox is a class-compliant USB audio device, which the Linux kernel supports without the need for any third-party drivers. Bear in mind that there are several reports of crackling problems with USB soundcards in the Presonus forums, even with Windows and OS X, so this issue is likely to be hardware-related in some obscure way.


Solution:2

I've had the same problem with my 44VSL. I spent hours uninstalling, reinstalling, trying legacy drivers. Always a crackle, then someone suggested I try a different USB cable in a different port.

You'd be surprised. Just by swapping out the cable and plugging it into a USB 3.0 port (even though the Audiobox is only USB 2.0, the USB 3.0 ports on my PC have USB 2.0 speed boost), I now get a crisp sound from my digital piano, no matter how loud I turn it up.

It might not work for you, but it's worth a shot. The Audiobox does seem to be very picky on it's connection to the PC.


Solution:3

Presonus Audiobox must be connected to an USB 1.0 or 2.0 port on linux. If you have USB 3.0 ports, you must disable XHCI on BIOS. If you can't disable 3.0 ports, try with an USB 2.0 HUB.

Also, if you have audio glitches only when you turn on Phantom Power, you must set an external power source to your usb port, or connecting the device with a dual power usb cable to solve this issue.

I have an Presonus Audiobox 2x2 connected to an old usb 2.0 HUB with external power and everything works fine. This issue it's related to the xhci driver.


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