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General speaker questions for audio and home theater.

RE: Are there established metrics for speaker specifications ?

"Frequency response (+/- 3dB): 39 Hz - 28 kHz
Low frequency point (-6 dB): - 6 dB 32 Hz"

I can tell right away it is a ported system. In 7Hz it drops from -3dB to -6dB which is a dead giveaway.

Speaker frequency response last I recall was 2/3rd octave pink noise. Also if you put 40Hz into a speaker and 120Hz comes out that is measured as valid output.

To make things even worse, they add a close miked response of the woofer to one of the port. They add these together but in reality they subtract.

All this came in the late 1970s and early 1980s. This is when they stopped overbuilding amps and they could not handle sealed cabinets, which technically should have no lower impedance than ported but does. They also took the low bass out of the bass controls to make it easier on the amp. I think they sound like shit. They turned the bass control into a mud control.

Also for a ported system the woofer has to be bottomproof. This means the suspension keeps it from bottoming. As a result when you get it cranked up it gets odd order distortion.

If you ever find a pair of speakers that actually rates THD you might have something there. The reason is that on most speakers the rating would be embarrassing. Why buy an amp with 0.005% THD when the speaker has 2% ? And many sound good at that. Good, but not excellent.


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  • RE: Are there established metrics for speaker specifications ? - JURB 11:51:06 03/15/21 (0)

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