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TAS2563YBGEVM-DC: Speaker Charecterization

Siddarth hudedamani
Prodigy 135 points

Part Number: TAS2563YBGEVM-DC
Other Parts Discussed in Thread: TAS2563

Since we are trying to proceed with tuning and I was in the speaker characterization step while doing this, I am unable to run the automated speaker characterization in PurePath Console 3 (PPC3); the electrical IV measurement sweep is unavailable. As a workaround, I attempted to manually enter the speaker parameters. When I manually set Fs between 450 Hz and 2 kHz, the audio becomes heavily compressed and exhibits a wavy sound. The audio only sounds clean when Fs is left at the default value of 3.24 kHz. However, I suspect this is not a valid solution and may be causing the excursion protection algorithm , Could You Kindly Help me With This  Any guidance would be greatly appreciated . Also, right now I am tuning in stereo mode. Is tuning in mono better than stereo?

 

  • 0
    TI__Genius 16250 points

    Due to public holiday, we will feedback you next working day.

  • 0 in reply to Shenghao Ding
    TI__Expert 4840 points

    Hi,

    The behavior you observe is an expected result of a misconfigured excursion protection model, not a hardware or firmware defect.

    • The TAS2563’s built-in smart amp excursion protection algorithm calculates real-time cone displacement based on a full set of Thiele-Small (T-S) speaker parameters, including Fs, Qts, Qms, Qes, Vas, Re and Le.
    • When you manually lower Fs to 450 Hz – 2 kHz without updating the rest of the T-S parameter set, the protection model drastically over-estimates low-frequency cone travel. The algorithm then engages aggressive, adaptive gain limiting to prevent what it interprets as imminent over-excursion. This continuous, signal-dependent gain adjustment is exactly what creates the "wavy", dynamically compressed sound you are hearing.
    • The default 3.24 kHz Fs value is a factory placeholder, not a valid speaker parameter. An Fs this high tells the algorithm that the speaker has almost no low-frequency displacement capability, so excursion protection barely activates. This is why audio sounds "clean" — but it is not a valid workaround. Running with incorrect T-S parameters effectively disables proper excursion protection, and you risk permanent physical damage to the speaker at high signal levels. You must not use this as a final configuration.
  • 0 in reply to Peter Wu5
    TI__Expert 4840 points

    For characterization and initial tuning: Mono is strongly recommended.

    • As noted above, single-channel operation produces more reliable IV measurement results with no crosstalk or synchronization artifacts.
    • Tuning one channel at a time makes it much easier to debug protection behavior, EQ response, and limiting thresholds.