I've read through post from December 9-11 about feed forward protection.
Feed Forward Protection algorithm uses speaker characterization parameters.
Both modes, Feed Forward and Feedback Protection use speaker characterization parameter. The difference is that Feed Forward Protection does not use I/V sense feedback from the speaker in real time.
and
The parameters entered in speaker model are used along with Learning Board to generate the characterization parameters.
The algorithm uses the latest ones, which are the parameters obtained from the speaker during characterization.
Question 1: Could you verify that using feed forward protection does still protect the speaker from overload? It sounds like using feed forward protection, there's a mechanism where the TAS2557 keeps track of how much power and how fast that power is sent to the speaker and limits the output to the speaker based on that information (based on the output power vs. voice coil temp determined during speaker characterization).
Question 2: In our voice audio application,
* with feed forward turned OFF: when we talk loudly, the output starts loud, but drops way off and stays low for ~20 seconds before it comes back up.
* with feed forward turned ON: when we talk loudly, the output starts at the same loudness, but the volume never falls off.
Is the speaker protected and "safe" if we use the feed forward protection turned ON?
Thanks.