10.6.4 USB Pro Speakers (G4 Cube) don't work on Macbook Pro

I updated to 10.6.4 and my USB Pro Speakers (G4 Cube) don't work but they worked with 10.6.3. These speakers match this Macbook Pro beautifully and I'd like to get them working again.

System Preferences shows USB as an Output Source in Sound Preferences and I can turn the volume up and down but nothing comes out.

I created a new account, same issue. I even deleted com.apple.audio.SystemSettings.plist hoping that would fix it and nothing.

They still work as verified by my roommates machine that's running 10.6.3 :/

help?

MacBookPro5,1, Mac OS X (10.6.4)

Posted on Jun 18, 2010 1:23 PM

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80 replies

Aug 26, 2011 5:52 AM in response to mgnagy

I've always managed to keep these speakers working by using an older .kext, until Lion. The odd thing is that after installing Lion it worked at first, but stopped at a certain point in time, and fiddling the kext now is to no avail.


I've delved deeper into this now. Actually, the device works absolutely fine. The amplifier box contains a DSP chip that takes care of converting the digital data stream to analog sound and drives the headphone output, and a digital T-amp chip that drives the speakers with the signal provided by the DSP chip. You will find that the headphone still works fine under Lion. That means the basic sound conversion still works. What does not work any more simply is the switching "on" of the T-amp chip.


See here what I did to my speakers when I did not yet realise this:

http://www.cubeowner.com/forums/index.php?showtopic=13516


Basically I planned to use the T-amp as a standalone amplifier, using the headphone out of my mac mini as the audio source. I got that to work relatively okay. With an older mac mini it works fine, but with my last-year mac mini I get a terrible whine, probably due to some ground loop. Only in the process I realised that the device basically is fine, it just needs the internal amplifier switched on, which does not work any more on modern OS X.


You can force the T-amp "on" by grounding two pins on the board (pin 11 and 16, MUTE and SLEEP), which is what I'll try when I find a new/second hand set of speakers.

Sep 20, 2011 4:45 PM in response to BimmerDob

(Haven't read the whole thread, sorry if I missed something)


FWIW: I managed to make my old Cube speakers work today on SL 10.6.8 (13" MBP Mid 2010) using this:


- extracted the AppleUSBAudio.kext from the Snow Leopard retail install DVD (I have the "New Version 10.6.3" disc). I used the file manager (muCommander) to explore the DVD as the Finder won't show all the files. There is a folder /System/Library/Extensions on a DVD, typically mounted under /Volumes/Mac OS X Install DVD/System/Library/Extensions


- copied/overwrote the original in /System/Library/Extensions


- I had to run the "Kext Utility" as there was a message about incorrect install. I believe all it needs to do is fix permissions.


- rebooted, speakers work! (had to switch them in Sound System Prefs) Much more bass compared to the "tinny" internal speakers!


Older SL DVD versions may work as well, even the non-retail ones shipping with Macs - they should all have the bootable OS on them with all system folders. So this should be doable without Time Machine backups and file mailing.

Sep 26, 2011 2:49 AM in response to mgnagy

great thread, I have only just noticed my G4 usb speakers (which were gathering dust) have stopped working as well as my soundsticks and put two and two together and googled it.


thanks.


difficult to access that old kext (whatever that is) when i dont even have a CD drive on this nice macbook air.


i sent some rude words to apple feedback. talk about planned obsolescence!


I got this machine to cut down on energy consumption, i did not think I would have to trash all my lovely harman kardons...


Ironically they practically force a trashy set of BOSE powerd speakers on me as a "freebie", peddling more rubbish.


so anyway, using Pacifist to try to find the kext on the original disk via remote DVD sharing from my wife's macbook pro (upgraded to 10.6.8...)


nothing is simple

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10.6.4 USB Pro Speakers (G4 Cube) don't work on Macbook Pro

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