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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: Re: Unsoundmind, My Response posted by Soundmind on October 25, 2006 at 04:36:16:
I don't know why Soundmind is continuing to bring this up. It so happens that a quickly rolled off frequency response has a different risetime than a slowly rolled off frequency response and a very different square wave response. An extended frequency response removes, or at least minimizes the potential problem of pre-shoot, ringing, and very slow risetime. When people test their high frequency hearing response, they usually listen to a single tone, rather than complex waveform. There seems to be a fairly predictable falloff in hearing single tone response, especially with age. However, a single tone is usually not be what we normally listen to when listening to music, so the transient response might well be more important than what would appear to be necessary just to listen to single tones. In this case, the low pass filters: 4 pole in the case of a Shure phono cartridge, 9 or more poles, in the case of a CD player based around 20KHz will strongly effect the transient response of a complex waveform. This is why analog oscilloscopes with a given rated bandwidth do not have steep rolloffs after the bandwidth rating. That is why my TEK 485, 350 MHz analog oscilloscope can actually show a 1ns risetime, 1 MHz square wave with little or no ringing,overshoot, or any other noticable change. Scale this sort of design approach down and you get 1us, 350KHz for a power amp perhaps and perhaps 10us, 35KHz for an overall hi fi design. Is this asking so much from your hi fi system?
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Follow Ups
- Re: Unsoundmind, My Response - john curl 06:57:49 10/25/06 (26)
- Every time you open your mouth, you just stick both of your feet in it deeper and deeper - Soundmind 07:08:26 10/25/06 (25)
- Re: Every time you open your mouth, you just stick both of your feet in it deeper and deeper - john curl 08:15:08 10/25/06 (24)
- You just don't get it. The time for the technical discussion of this topic ended three and a half weeks ago - Soundmind 08:26:57 10/25/06 (23)
- Re: You just don't get it. The time for the technical discussion of this topic ended three and a half weeks ago - john curl 11:49:57 10/25/06 (22)
- You can't change history that easily, silly. - jneutron 09:50:59 10/26/06 (0)
- John, John - E-Stat 08:49:08 10/26/06 (16)
- Re: John, John - john curl 10:01:53 10/26/06 (0)
- "We should rejoice in this continuing source of levity." There ya go! nt - clarkjohnsen 09:00:42 10/26/06 (14)
- I know I can, just by re-reading John Curl's "serious discussion" with May Belt about cables - Soundmind 14:25:54 10/26/06 (13)
- No surprise here - E-Stat 05:43:43 10/27/06 (10)
- You would be best off..... - Soundmind 06:11:01 10/27/06 (9)
- Why certainly - E-Stat 06:31:04 10/27/06 (8)
- Re: Why certainly - Soundmind 06:48:35 10/27/06 (7)
- R-E-A-D---M-O-R-E---S-L-O-W-L-Y - E-Stat 06:59:23 10/27/06 (6)
- T-H-I-N-K---M-O-R-E---C-L-E-A-R-L-Y - Soundmind 07:12:42 10/27/06 (5)
- Still missing the point - E-Stat 07:52:56 10/27/06 (4)
- You're wrong as usual - Soundmind 08:36:01 10/27/06 (3)
- Exactly - E-Stat 09:01:24 10/27/06 (2)
- Re: Exactly - Soundmind 09:12:57 10/27/06 (1)
- Gotcha. Have no idea as to the meaning of "qualitative" (nt) - E-Stat 09:24:23 10/27/06 (0)
- Re: I know I can, just by re-reading John Curl's "serious discussion" with May Belt about cables - john curl 21:35:32 10/26/06 (1)
- Re: I know I can, just by re-reading John Curl's "serious discussion" with May Belt about cables - Soundmind 05:22:06 10/27/06 (0)
- Normally I'd ignore your obsessive focus on this topic but I have a question for you - Soundmind 12:36:06 10/25/06 (3)
- Re: Normally I'd ignore your obsessive focus on this topic but I have a question for you - john curl 14:35:11 10/25/06 (2)
- Re: Normally I'd ignore your obsessive focus on this topic but I have a question for you - Soundmind 07:26:27 10/26/06 (0)
- Re: Normally I'd ignore your obsessive focus on this topic but I have a question for you - john curl 15:46:13 10/25/06 (0)
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