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Learn to tune a sound system, one level at a time.

Six levels, from your first sub alignment to reading the measurement yourself. Lessons explain the idea, practice lets you try it on a simulated sound system with your answer marked, and guides take you through a real one. Each item opens here when it is ready.

Start at level 1All six levels ↓

  1. Level 1: First success

    Line up a sub with the tops, with the app giving you the answer.

    AcoustiTrack Mobile · AcoustiTrack

    • LessonWhat is time alignment? · Coming
    • PracticeTops and sub, lined up · Coming
    • PracticeThe sub that hides · Coming
    • PracticeA sub wired in reverse · Coming
    • VideoFind the reversed sub · Coming

  2. Level 2: See why

    See why it worked: the timing and the phase, in pictures.

    AcoustiTrack Mobile · AcoustiTrack

    • LessonWhat an impulse response shows · Coming
    • LessonPhase, in one picture · Coming
    • PracticeWhere do they cross? · Coming
    • PracticeThe back wall · Coming
    • PracticeThe sub in front · Coming

  3. Level 3: Read it yourself

    Find the answer from the measurement alone.

    AcoustiTrack Mobile · AcoustiTrack

    • LessonReading a transfer function · Coming
    • GuideWhat coherence means in a transfer-function measurement · Coming
    • PracticeExpert mode on the Easy and Medium scenarios · Coming

  4. Level 4: A real system

    Line up your own speakers, on a real sound system.

    AcoustiTrack Mobile with an audio interface · AcoustiTrack

    • LessonWhat a measurement is · Coming
    • LessonHook it up · Coming
    • GuideHow to time-align subwoofers with the main speakers · Coming
    • VideoYour first sub alignment · Coming

  5. Level 5: The whole PA and the room

    Set up a whole PA and find what the room is doing.

    AcoustiTrack

    • LessonRead the spectrum · Coming
    • LessonTonal balance: will EQ fix it? · Coming
    • GuideHow to measure reverberation time (RT60) in a room · Coming
    • PracticeLate and reversed · Coming
    • PracticeA lively hall · Coming
    • PracticeA noisy venue · Coming
    • PracticeThe line array and the sub stack · Coming

  6. Level 6: Expert

    The hard scenarios, with the answer hidden: only the charts to go on.

    AcoustiTrack

    • PracticeThe same four, in expert mode · Coming