So many scattered posts… I seem to remember reading that radiating area of a driver's cone contracts as frequency increases. Around 5-6 kHz radiated sound is from the central dome but at a significantly reduced level, which is why the highs would have to be cranked to hear it. 40-4000 Hz covers the lion's share of useful BG frequency but it's impressive that this 12" driver can get that kind of extension.5StringPocket quoted Alex, who said "It isn't a frequency cut off. The cone rolls off around 4kHz, it doesn't stop dead. The central dome rolls off around 10kHz. Crank the highs and you'll get a lot of treble extension out of the 12XN drivers."
Glad he dug that up, very useful info.
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