Could imagine a f3 (frequency response is -3dB below the average sound pressure level of the loudspeaker) of 22-30 Hz as realistic, depending on whether the
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Some may say that this is hardly any difference to 15Hz, but in this frequency range, a 5 Hz difference in passive speakers is already a world away.
A few marketing buzzwords are what such a speaker must offer the consumer. The sensitivity should definitely reach the "magic limit" of 90 dB and at the same time still be able to play so low that even subwoofers can't keep up.
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Precisely because there is no binding standard, it should always be pointed out when something sounds too fantastic.
For the 800D3, the manufacturer specified (the specifications look somehow familiar
):
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Independent
measurements then confirmed the sensitivity of 90dB (even reported 90.7dB), but for that, the low-frequency capability claims were pure fantasy.
An f3 of about 37Hz and an f6 of 29Hz are galaxies away from the manufacturer's claims of 15Hz.
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Update: When someone spends $30,000 or more on a speaker, it's probably to give the buyer the feeling that Bon Scott so aptly put it, "But we've got the biggest balls of them all."