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Speaker Asylum General speaker questions for audio and home theater. |
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Speaker Asylum General speaker questions for audio and home theater. |
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In Reply to: Ultrasonic Nonsense, speakers, etc. What do you guys think? posted by g_greenamyer@yahoo.com on March 11, 2012 at 20:48:58:
A number of things in hifi now depend on ones belief they work to work.
That sounds tacky I know but what you know has a very strong impact on how you interpret things. G
oogle the Mcgurke effect to see an example of what you actually hear taking a back seat to what you see and know.
One can hear ultrasonic energy too if it’s loud enough, I used to work on ultrasonic transducers made for acoustic levitation and used in a couple experiments flown n the space shuttle (STS-7 and STS-51a). Experiments have shown that under the right conditions, one can detect very short time difference between ears corresponding to the 100-200KHz range.
THIS is not the same as hearing / detecting a tone at those frequencies though and what people describe as “air” is more likely to be in the 8-10KHz range.
When a purveyor of a “super tweeter” and other magic stuff posted about them in one of the forums here, after some pressing, he was eventually able to admit they do not actually produce sound, they are not actually driven by the amplifier signal and that even though they appear to be very small horns, are pitched as a super tweeter and hooked up like speakers.
AS you mentioned it is very hard to capture very high frequencies also and a medium like a CD cannot store signals above 22KHz and are brick wall filtered to keep them out. That’s actually ok too as most people over vastly estimate the frequency when presented with a tone, adults generally can’t hear even 20KHz unless it’s loud and against a silent background. Google the ears response curves to see this part of the problem, google “equal loudness curves” which show the difference between actual measured loudness and how loud it sounds to ones ears.
Best,
Tom Danley
Danley Sound Labs
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Follow Ups
- RE: Ultrasonic Nonsense, speakers, etc. What do you guys think? - tomservo 05:55:51 03/12/12 (12)
- In other words, you have no idea. - carcass93 14:57:45 03/12/12 (6)
- RE: In other words, you have no idea. - tomservo 18:28:34 03/12/12 (5)
- RE: In other words, you have no idea. - Inmate51 08:00:29 03/13/12 (4)
- RE: In other words, you have no idea. - tomservo 08:16:53 03/13/12 (3)
- RE: In other words, you have no idea. - Inmate51 14:44:52 03/13/12 (2)
- RE: In other words, you have no idea. - tomservo 16:28:47 03/13/12 (1)
- RE: In other words, you have no idea. - Tony Lauck 17:12:21 03/19/12 (0)
- Ultrasonic - Kloss 07:42:19 03/12/12 (2)
- RE: Ultrasonic - tomservo 11:00:06 03/12/12 (1)
- RE: Ultrasonic - Kloss 13:05:16 03/12/12 (0)
- "One can hear ultrasonic energy too if it's loud enough," - Kal Rubinson 07:11:45 03/12/12 (1)
- You know I often - Presto 14:15:39 03/13/12 (0)
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