
KEW
Audioholic Overlord
I won't argue with you there, but among the larger speaker manufacturers, DefTech is the most consistently extreme with their exaggerations.Lots of bad specs in marketing.
Companies like Paradigm give FR that includes room gain to have a deeper bottom end than anechoic, but they do point out in the fine print "in a typical room" or some such wording.
I decided to look up an array bookshelf speakers with ~5.25" (unless specified other size) drivers to see what speakers companies did for specifications:
Philharmonic Mini (5.0")..65 Hz - 20kHz +/- 2db Sealed, 55 Hz - 20 kHz Ported
Klipsch RP-150m..............48-25kHz +/- 3dB
Yamaha NS-333 (5.0")......65 Hz - 35 kHz (no dB range given)
KEF ls-50...........................79Hz - 28kHz +/- 3dB
Focal Chorus (5.5")...........65Hz - 28kHz +/- 3dB
Boston Acoustics A25......55Hz – 25kHz +/- 3dB
Canton Plus GXL.3 (5.0")..45-26.000 Hz (no dB range given)
BIC DV52siW.....................70hz-20khz (no dB range given)
Polk T15............................60Hz-24kHz (no dB range given)
QA 3020 (5.0")...................64Hz-22kHz +/- 3dB
ELAC Debut B5..................46 to 20,000 Hz (no dB range given)
Sony SSCS-5......................53~50,000Hz (no dB range given)
Compare all of the above to:
DefTech SM 65.................30 Hz → 30 Hz (no dB range given)
So I believe you are correct that DefTech is not the only company to give false spec's; however, they do, IMHO, deserve special mention as a true leader in false specifications anytime the topic comes up.
Canton, Klipsch, and Elac are a distant 2nd, 3rd, and 4th (not in any specific order)!
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