Previous 1 2 Next 18 Replies Latest reply: Aug 2, 2008 1:37 PM by drummah
drummah Level 1 (0 points)

I got my Mac Pro for several days, and I'm trying to start my work with music. But I got a problem
and have no idea how to deal with it.

I got two FireWire sound cards - MOTU Traveler and TC Konnekt 24D - all of them working
perfectly under PC. Have downloaded and installed all updates to Mac OS X and latest drivers
for those sound cards. When I'm plugging them to my Mac Pro - they appear normally - i mean
software bundled with drivers indicates that cards are present. But when I'm trying to do some
playback actions through MOTU or TC (i never using them together - only separately) - it seems
like they are out of synch with firewire - they begin to do some weird things. for example
TC Konnekt 24D - indicates that device is out of sync, and MOTU Traveler - just producing some
ultra-high frequency low-volume noise and that's all. Have tested that in several programs,
Logic, Bias Peak and etc. If i will try to turn-off and then turn-on those cards several times -
sometime i got them to function normally. But 90% of the time they do not work correctly.
All the firmware versions in these cards are up to date, also i've used latest driver versions for

I found something strange in my System Profiler, under the FireWire subcategory:

*FireWire Bus:*

Maximum Speed: Up to 800 Mb/sec

*Built-in Hub:*

Manufacturer: Unknown
Model: Unknown
Maximum Speed: Up to 800 Mb/sec
Connection Speed: Unknown

Vendor 0x1F2 Device 0x107800:

Manufacturer: 0x1F2
Model: 0x107800
GUID: 0x1F2000001966F
Maximum Speed: Up to 400 Mb/sec
Connection Speed: Up to 400 Mb/sec
Unknown Unit:
Unit Software Version: 0x9
Unit Spec ID: 0x1F2

is that normal?
is it possible that my firewire drivers are broken?

I've also tested those cards with regular PC computer - all working excellent at all samplerates,
buffer-sizes and etc.

Intel Mac Pro (2008) (dual Xeon 2.8), Mac OS X (10.5.4)
  • DaddyPaycheck Level 6 (16,030 points)
    Hi drummah-

    Greetings and welcome to the Apple Discussion boards :-)

    Have you configured the interfaces in the Midi Setup utility?


  • drummah Level 1 (0 points)
    yes, all the cards are looking normal in audio midi setup utility. but when i'm trying to test
    channels - result is the same - out of synch or strange ultra-high frequency noises.
  • DaddyPaycheck Level 6 (16,030 points)
    Do you have any other external devices connected, such as hard drives?


  • drummah Level 1 (0 points)
    nope, i always plugging in one FireWire port - just tested one from the front of a Mac Pro,
    all the same. I have only external USB devices - keyboard and mouse and USB hub.

    errghh, i've bought such expensive stuff with hope to forgot those "PC-like" problems
    and now troubles started again :/

    also do anyone know - when I'm using Time Machine to transfer account and personal stuff
    from another computer - can it also transfer some Kexts and drivers from old system?

    i don't know if it is possible that Branded native Intel Mac will show built-in Unknown FireWire
    hub devices in System Profiler..
    that looks strange for me.
  • drummah Level 1 (0 points)

    have reinstalled Mac OS X Leopard from scratch. Also I have installed only
    audio drivers to clean system - got same results - firewire working bad.
    also FireWire bus still have status of unknown device:

    Built-in Hub:

    Manufacturer: Unknown
    Model: Unknown
    Maximum Speed: Up to 800 Mb/sec
    Connection Speed: Unknown

    it seems that it is Mac OS X firewire driver level problem.
    how can i send this to Apple technical support team? I've
    searched all of their site and didn't found the way to contact them.
  • drummah Level 1 (0 points)

    Traveler starting to work normally when I turn it on and then reboot my Mac Pro
    - _with Traveler turned on_. But if i will turn it off and then turn on again - it will not
    work until next reboot... Strange since FireWire is "hot plug" standard.
  • DaddyPaycheck Level 6 (16,030 points)
    Have you checked the websites of the manufacturer's of your devices to see if any of them have updated Mac drivers?


  • drummah Level 1 (0 points)
    yes, sure i've checked that. As i noticed before - all the drivers are up to date, additionally
    - all firmwares are updated and latest OS X updates are installed.
  • DaddyPaycheck Level 6 (16,030 points)
    Are you powering the MOTU via an external power supply or is it bus powered?


  • drummah Level 1 (0 points)
    checked both types of connections - bus powered and from external AC adaptor - no changes.
  • DaddyPaycheck Level 6 (16,030 points)
    Try the MOTU with only the mouse and keyboard connected to USB.

    Are you trying to run Time Machine backups at the same time? What are you using for speakers?

    Although a FireWire device can be plugged in when on, most systems do not like it when you do so-especially audio interfaces.


  • drummah Level 1 (0 points)
    Also tried that setup yesterday with clean Mac OS X installation. no changes.

    no, sure I'm not backing up anything at the same time

    May be that's a cause of the problem - fact that i need to turn on device and restart Mac OS X to get
    audio interface to work correctly.
    Sure - I do not plugged it in firewire port while device is on. MOTU has on/off switch- so you can
    turn it off while don't need it and then turn on when you want to work with audio interface.

    When I was in windows - that worked that way: i've loaded OS, then I've turned on MOTU, windows
    loaded drivers and all the stuff become ready for work. in any time I can switch MOTU off and then
    switch on again - and interface will be ready for work again.

    But it seems that Mac OS has a limitation for firewire audio interfaces - so you need to turn it on
    before OS startup and then do not turn off in any case.
  • drummah Level 1 (0 points)
    as for speakers : I'm using studio self-amped monitor which are connected to MOTU interface via
    analog balanced cables.
  • DaddyPaycheck Level 6 (16,030 points)
    I found this document that indicates that your Mac Pro is indeed a little "different" when it comes to interfaces: Mac Pro: Audio may not switch when new devices are connected

    I also found this: Mac OS X 10.4.10: No sound from some FireWire audio interfaces

    I realize it says 10.4.10 and "no sound" but it still may be helpful.


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