The technology described in this document can be embodied in a seat headrest that includes an interior chamber that accommodates an acoustic transducer, and an acoustic channel disposed between the interior chamber and an external opening in the seat headrest. The headrest also includes a soft outer layer disposed around at least a portion of a periphery of the external opening, and a grill mount. The grill mount is disposed in or attached to the outer layer, the grill mount extending, at least in part, around the periphery of the acoustic channel, and configured to engage with a portion of a speaker grill-assembly in a mating configuration.