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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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In Reply to: Hear that, Tom? posted by Bill Fitzmaurice on February 5, 2007 at 20:11:17:
Hi BillWell it depends.
The 1W 1M spec is sometimes used to estimate how loud the speaker will be at another distance and power. For that use, it is desirable to have an accurate measure.The inverse square assumption for a point source assumes the source is small and occupies none of the volume in the space. Digging a big hole to drop the cabinets into is not practical but having enclosures which occupy a significant fraction of that 1 meter radius with an inflexible obstruction or have a large source area, is also not desirable so far as accuracy.
In addition, close to an lf source, one can measure “psudo sound†error which is a microphone signal caused by kinetic reaction of the moving air hitting the element and NOT radiated acoustic pressure.
All of those concerns are essentially eliminated when measuring at a larger distance, say 10 meters where 100Watts drive equals the 1W 1M level.Also, in answer to the original post, yes one normally does see some distance related changes in response. Up close, one has more low end than farther away.
For example, an SH-50 measures a gradual rise in low end response at one meter where as by the time one measures past about 6 meters, the low end is slightly depressed.
In general, the more a sources DI changes with frequency, the greater the response changes with distance.
Best,Tom
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Follow Ups
- Re: Hear that, Tom? - tomservo 06:51:37 02/06/07 (0)
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