ForceMajeure
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I can't find any spec sheets for that ED30761 though.
The ED29689 does look kinda "bad" though. But I guess it is being used as woofer here so perhaps the region the datasheet don't show is good.
Knowles ED30761 is used as the bass driver, it have no spout so the tube is shrink tube.
The ED29689 is "leveled" to the ED30761 spl by using a 20ohm resistor.
Both drivers are us as full range meaning no electrical filtering, only dampers and resistor in series.