Results 1 to 6 of 6
  1. Motu Traveler Mk3 - Phase shift?

    #1
    Junior Member
    Join Date
    Feb 2014
    Location
    Germany
    Posts
    3

    Default Motu Traveler Mk3 - Phase shift?

    Hi guys,

    I want to update my system but after some measurements with the new Motu Traveler Mk3 I am surprised.

    During the A/B comparison with my RME Fireface UC there is a phase shift about 45° (8 - 16khz) inside the Motu?
    Smaart is configured with Main 1/2 to the PA system, Out 8 goes to Input 8 as ref. signal, Mic 1 is used for the measurement mic.

    I got the same result if I just do a measurement with the main Out 1 directly to Mic Input 1 and reference like before.

    Does anyone work with the MOTU Traveler MK3 or know about that phase shift between the Line Inputs and Mic inputs??

  2. Re: Motu Traveler Mk3 - Phase shift?

    #2
    Senior Member
    Join Date
    Mar 2010
    Location
    The Netherlands
    Posts
    94

    Default

    I've not worked with that specific model but could be there's a low-pass filter at the very high end?
    I see this most of the time in measuring x-overs. Phase should be flat but there are high & low-pass filters to prevent the x-over to go under 20Hz and past 20K.
    I take it the phase goes down in the high end.

  3. Re: Motu Traveler Mk3 - Phase shift?

    #3
    Junior Member
    Join Date
    Feb 2014
    Location
    Germany
    Posts
    3

    Default

    I set all values to off at CueMix and double check it several times.

    If I use my Fireface UC inside smaart and want to measure the Motu to see the linearity of frequency and phase for the Motu AD/DA there are two shifts.
    The phase trace of the Mic Input goes up (starts at 1kHz) to 77° at 18kHz and the Line Inputs goes down to 64°. The result would be okay for working with smaart, because in the smaart setup they will put out these phase response and have a shift of 14° in the high end.

    But an Interface in this price section should have better linearity in my opinion.

  4. Re: Motu Traveler Mk3 - Phase shift?

    #4
    Junior Member
    Join Date
    Jun 2016
    Posts
    1

    Default

    I have very similar if not identical results measuring both a Yamaha CL5 console and an original Apogee Duet. Around 45 degrees phase shift at 16k and maybe -15 degrees around 30 Hz. This is a straight output to input test with no gain or filters. I had originally thought it was due to some filtering in the design of the AD and DA converters. I’d be interested to see what others think. I too think there “should” be linear phase but maybe I’m wrong?


    Sent from my iPhone using Tapatalk

  5. Re: Motu Traveler Mk3 - Phase shift?

    #5
    Junior Member
    Join Date
    Dec 2018
    Posts
    1

    Default

    Hello...I don't know the differences at all, but I really liked my original traveler. Physically it looks exactly the same. I had no issues with it and if had the choice to save money over buying a new one, i would. I personally don't care about the added DSP.

    pcb prototype
    Last edited by HoltRead; December 21st, 2018 at 12:24 PM.

  6. Re: Motu Traveler Mk3 - Phase shift?

    #6
    Junior Member
    Join Date
    Jan 2019
    Posts
    4

    Default

    I've not worked with that particular model but rather could be there's a low-pass channel at the specific top of the line?

    I see this more often than not in estimating x-overs. Stage ought to be level however there are high and low-pass channels to keep the x-over to go under 20Hz and past 20K
    Tutuapp 9Apps Showbox .
    Last edited by klimbo; January 24th, 2019 at 03:40 PM.

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •