IMAC BigSure 11.3, Motu 828mk3 - Firewire - USB-C, Kemper Rigmanager - System crashed

    Hello everybody,

    I connected my MOTU 828mk3 (Firewire) to the IMAC (previously HighSierra now Big Sure 11.3) via the Firewire to USB-C adapter. Unfortunately, the IMAC crashes completely and reboots every now and then. I couldn't really find / reproduce the correct cause of the crash. However, I have noticed that I always crash when I run the Kemper Rigmanager on the MAC - it can work longer and then - reboot ..? Maybe someone has a similar setup / also a MOTU mk3 on the Mac?


    I exchanged ideas with both Kemper Support and Motu Support - so far without success….


    Any ideas ? Cables from the interfaces to the IMAC have all been replaced - no success, RM, Kemper Head and Moto are each installed on the latest update.


    SG Micha

    What about the system log.
    Start the console.app on mac double check the system carsh log.
    What happens if you don't plug the Firewire to USB-C adapter ?
    What adapter is it (brand) ? and is there a an extra driver needed?
    How is the USB Port and Firewire Port displayed.
    Click Systeminfo Systemreport.
    You can also check the Kemper Debug log (Documents/Kemper/Rigmanager/debuglog.txt)

    Be the force with you ;)

    Thank you,


    I have already sent various log files to the Kemper team and also to MOTU - Kemper taps the Motu driver, Motu does not have a current driver (build 2-2020), but apparently does not know the problem either. Today Just had another crash - this time without the active rig manager ...) - I called Apple - have reset SMC / NVRAM and also tap the "old" Motu driver as the cause.


    I would be interested in whether somebody also works with the MOTU interface on the MAC?


    SG Micha

    I think it's an adapter issue.
    So what I understand is the following routing


    iMac -> USB/C -> Firewireadapter -> Motu

    iMac -> USB2 -> Kemper


    Don't mix USB2 with USB/C (USB3)

    If you MIX USB2 (Kemper) with USB3 on one USB Controller you may get instability because of the different data rate.

    Be the force with you ;)

    Tanks, but

    - Motu: iMac -> Thunderbolt 3 (USB-C) -> Firewireadapter -> Motu

    - Kemper Head - USB out to USB(3) MAC in - The Mac doing have USB2 Ports


    Today the Kemper Head was not connected, the RM was not running, the MAC crashed ;)