It's my understanding that a filter such as an apodizing filter that aims to decreasing pre-ringing inevitably causes phase shift in the treble and / or treble rolloff (while making no comment on the desirability of an apodizing filter vs the lack of phase shift and / or rolloff
). Since I see neither phase shift nor rolloff in the spec sheet, I'm assuming that it wasn't turned on in the end, tom.
The way I see it, you might need an apodizing filter if you find that you have tested that you can hear a 22.05kHz sine tone (rather than any distortion products produced in the attempt from poor transducers to produce said tone), and thus there exists the possibility that you can hear the ringing at 22.05kHz produced by a brickwall filter for 44.1kHz audio