High Efficiency Speaker Asylum

RE: I am puzzled by some JBL. Tech sheets list measured at 15 feet

73.186.230.3

Bill Fitzmaurice

In Reply to: RE: I am puzzled by some JBL. Tech sheets list measured at 15 feet posted by Edp on February 18, 2024 at 08:26:17

The key word is vintage. Before the 1970s, and in some cases even more recently, many manufacturers went by their own rules. EV, for instance, measured sensitivity at 4 feet. As for JBL, there was a period during which their driver inputs were labeled black for +, red for -, the opposite of the accepted convention.

Follow Ups:

Are there present standards for that segment, not home audio? - Edp 08:47:47 02/18/24 (3)
In the pro audio / sound reinforcement are there standards for performance measurement that are not a normal home audio standard?

I could see, as an example, that polar response of a given setup would be more significant than home
- RE: Are there present standards for that segment, not home audio? - Bill Fitzmaurice 09:39:48 02/18/24 (2)
  Not really. You see a lot more information, like polar response, because many pros want it, while most average consumers don't know what it means anyway. Interestingly the higher the price the more data you'll get in pro-sound, and the less you'll get in consumer sound. One must assume that high end manufacturers don't want potential customers to know that the Emperor isn't wearing any clothes.
  The only instance where I've seen a major data improvement by a pro-sound manufacturer is Danley Sound Labs, who measure sensitivity with 100 watts at 10 meters, which is the equivalent of 1 watt at one meter. That gives a far better idea of how they work in real world conditions.
  - RE: Are there present standards for that segment, not home audio? - claudej1@aol.com 18:41:01 02/18/24 (0)
    I agree with the Danley measurement methods. They end up Under Rating the speaker performance, opposite of the rest is seems, since those others are overrated with peak sensitivities, etc.
  - Interesting, thanks - Edp 11:35:34 02/18/24 (0)
    Nice insight
    
    Like the 10 meter and its direct relationship to the 1w/1m standard.
    
    Fairly certain most of my home audio creations would sound / measure more like a mid squaker at 40 feet than a complete speaker

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