No it isn't - Ross - Speaker Asylum

No it isn't

208.243.96.98

Posted by Ross on July 29, 2002 at 13:55:38

In Reply to: Re: This is silly... posted by Pat D on July 29, 2002 at 12:51:30:

Back in the early 1950's (US Army) and in the past few years (CalTec), it was shown that humans can percieve signal material above the accepted limit of human hearing (generaly 20khz). The tests played material first with and then without ultrasonic content. The absence of the ultrasonic content was noticed though was not specificly identified. Theory is that while we do not consciously recognise ultrasonic material, the presense of same still excites our hearing mechanism and causes impulses to be sent to the auditory portion of our brains. On a subconscious level, we are "aware" even if we can not verbalise what we are aware of.

I think we all agree that the brick wall filter of 16/44 Red Book cuts off ultrasonic harmonic information, to the detriment of sound (lets not even get into to distorions produced as harmonics are reflected back off of the brick wall filter).

Original master tapes, made before digital mastering was prevalent, contained sonic information above 20khz. Analogue equipment IS capable of reproducing the ultrasonic content (yes even tube amps and phono cartridges) of the master tapes. If speakers can be made to reproduce the ultrasonic spectrum cleanly, shouldn't that be a benefit ?

As for SACD- Stereophile was kind enough to publish spectra content of SACD and previosly of their own recordings (that they have released), both clearly showed harmonic content above 20khz.

As we go forward into higher resolution digital, ultrasonic content will become the norm rather than the exception.

Best,

Ross

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Follow Ups Full Thread

Topic - 20khz to 50khz upgrade? - twhaase 08:45:03 07/27/02 (26)

I'm willing to bet... - BrassMonkey 10:58:35 07/30/02 (0)

This is silly... - JonB 17:03:09 07/28/02 (5)

Re: This is silly... - Pat D 05:30:41 07/29/02 (4)

Re: This is silly... - JonB 07:02:54 07/29/02 (3)

Re: This is silly... - Pat D 12:51:30 07/29/02 (2)

No it isn't - Ross 13:55:38 07/29/02 (1)

Re: No it isn't - Pat D 14:09:52 07/29/02 (0)

Re: 20khz to 50khz upgrade? - BTW 17:31:37 07/27/02 (0)

Re: 20khz to 50khz upgrade? - tomcat 16:28:08 07/27/02 (0)

Re: 20khz to 50khz upgrade? - Todd Krieger 13:29:55 07/27/02 (0)

Re: 20khz to 50khz upgrade? - twhaase 13:14:01 07/27/02 (2)

High quality tweeter - layman 14:42:44 07/27/02 (1)

Re: High quality tweeter - ka7niq 05:14:14 07/29/02 (0)

OK, My Dog Insists I Do this Upgrade Also, Will DVD-A ... - 2x6spds 12:43:48 07/27/02 (0)

Do yourself a favor... - R. Hertz 12:34:37 07/27/02 (0)

The beat goes on - Duke 10:52:06 07/27/02 (6)

Trumpets at 34khz? - airtime 14:58:31 07/27/02 (5)

With a Harmon mute, significant energy up to 100 kHz!! - Duke 15:31:44 07/27/02 (4)

Re: With a Harmon mute, significant energy up to 100 kHz!! - Pat D 17:37:56 07/29/02 (0)

Re: With a Harmon mute, significant energy up to 100 kHz!! - TOOL 02:32:12 07/28/02 (0)

BFD... - Bare 22:24:28 07/27/02 (1)

??? - Duke 01:52:39 07/28/02 (0)

And don't forget the degeneration of the low frequencies too - airtime 09:57:36 07/27/02 (1)

Re: And don't forget the degeneration of the low frequencies too - libor 11:35:43 07/27/02 (0)

Re: 20khz to 50khz upgrade? - 2x6spds 09:51:54 07/27/02 (0)

Re: 20khz to 50khz upgrade? - Bare 09:37:06 07/27/02 (0)

Follow Ups

No it isn't - Ross 13:55:38 07/29/02 (1)

Re: No it isn't - Pat D 14:09:52 07/29/02 (0)

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