High Efficiency Speaker Asylum: Re: We disagree on a couple of points by tomservo Need speakers that can rock with just one watt? You found da place.

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Posted by tomservo (M ) on February 20, 2006 at 06:52:44

In Reply to: Re: We disagree on a couple of points posted by EGeddes on February 20, 2006 at 05:37:42:

Hi Earl

Not to pick nits but looking at the hearing sensitivity curves one can easily see why ones ears are not as sensitive to distortion at higher frequencies, conversely, one would also conclude that at low frequencies, that one is MORE sensitive to distortion, not less.
For example, Dolby labs (Benjamin and Fielder (sp)) did a paper many years ago on subwoofer performance.
They concluded, that there weren’t any home subwoofers which could produce audible 20Hz, without audible distortion.
Because of the hearing sensitivity curve, one finds that at the threshold of hearing, at 20Hz, that a 3rd harmonic of only 7% has an EQUAL subjective loudness as the fundamental at 20Hz.
Clean low bass is not easy, it is very hard.

I think it is more an issue of “if” a mfr chooses to make it an issue, not, “if” linearity is fully irrelevant.
If your talking about differences you can easily hear, it does seem to matter at least in the lower 2/3 of the spectrum.
I wasn’t aware the discussion was limited to spouse friendly living rooms, rather it was “if” a bass horn was practical or not.

“This is not what the scientific data says”.
I have originated a number of novel solutions for technical problems for Scientists and PHD’s by following what I observed in the actual circumstance. I am comfortable following what I see even if on the surface it contradicts what is “known”. First hand I found many academics don’t try things because they “know” it won’t work, yet sometimes there are exceptions to the rules, or the circumstances are “enough” different..
That aspect was actually fun at times, I originated all but one of that companies patents in the process.

I mention the BT-7 as it is a bass horn. Yes, it has a rotary motor, “back then” it was totally impossible to arrive at the proper parameters with a VC driver.
From the electrical terminals, one would not see anything different that a pair of 15”s with the same combined parameters, its electromechanical action as a driver is identical, it simply uses a rotary motor and rotary to linear converter instead of a VC.
My point was, the acoustic path contributes very little so far as distortion, most of it is the driver and at that it is primarily associated with motion.
I simply don’t have high level distortion measurements on the new products, which do use a conventional driver(s) to refer to.

Disagreement is not bad, it would be pretty dull if everyone had the same experiences and saw everything the same way. Sometimes progress can even be the result from seeing things differently.
Best,

Tom

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