I am working with a prototype board (not the AD Dev board) of the SSM2306. The part seems to work fine driving an 8 Ohm speaker, but when I connect to our 40 Ohm (16 mH) headset driver I get only a repeated clicking sound.
My speculation is that the higher voltage is being detected as a turn on pop and suppressed, but that is just a guess. I have also tried a couple of other class D IC's from various suppliers, and gotten similar results from about 2/3 of my samples. The ones that seem to work are the ones with no features...
For this application I am more interested in the simplicity and footprint than the pop suppression, but pop suppression (if it really works) would be a bonus.
The most likely culprit is of course user error of some kind, but I don't understand why a lower impedance speaker wiuld fix it. Has anyone else had this problem? Does anyone have any insight on how I can go about picking out a power amp for a 40 Ohm driver beyond ordering sample after sample and trying them?