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Old 4th November 2012, 07:10 PM   #5331
Telstar is offline Telstar  Italy
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Originally Posted by Julf View Post
Depends on how you define "clean". Is "clean" response within +-3 dB? Or an absolute upper limit at least 2 * higher? Or something else?
-3dB at 30khz is fine, including also the eventual amplifier rolloff.
With clean i meant two things:
*perfect 15khz squarewave
*no dithering/aliasing artifacts up to 30khz (better 50)
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Old 4th November 2012, 07:12 PM   #5332
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anytime the HF debate comes up, I can't help but remember that most of the audio catalog available today is in a format that can't hold any audio info past 22kHz. last time I checked, oversampling can't "reinvent" the information that has been low-pass filtered at the recording side in order prevent aliasing.
I've read many positive reports about super-tweeters. funnily, the latest I can remember came from a guy that used RedBook. talk about credibility...
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Old 4th November 2012, 07:14 PM   #5333
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-3 dB at 30kHz will not give you "perfect" 15kHz squarewave.... not at all. You'll need bandwidth far into the MHz range for that.
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Old 4th November 2012, 07:17 PM   #5334
Julf is offline Julf  Europe
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Quote:
Originally Posted by Telstar View Post
*perfect 15khz squarewave
Why? Nobody listens to 15 kHz square waves.

Quote:
*no dithering/aliasing artifacts up to 30khz (better 50)
Again why? if you can't hear those artifacts, all you need to do is make sure they don't cause any intermodulation or distortion.
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Old 4th November 2012, 07:20 PM   #5335
Julf is offline Julf  Europe
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Originally Posted by mr_push_pull View Post
anytime the HF debate comes up, I can't help but remember that most of the audio catalog available today is in a format that can't hold any audio info past 22kHz.
Maybe some of us only listen to quadrophonic vinyl from the 70's
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Old 4th November 2012, 07:21 PM   #5336
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Originally Posted by StigErik View Post
-3 dB at 30kHz will not give you "perfect" 15kHz squarewave.... not at all. You'll need bandwidth far into the MHz range for that.
I guess he meant perfect as in as much as the scope's display allows, given certain timebase
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Old 4th November 2012, 07:22 PM   #5337
Julf is offline Julf  Europe
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Originally Posted by StigErik View Post
-3 dB at 30kHz will not give you "perfect" 15kHz squarewave.... not at all. You'll need bandwidth far into the MHz range for that.
Well, to be precise, to get perfect square waves you need unlimited bandwidth. Hmm... Maybe there is a need for terahertz amps...
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Old 4th November 2012, 07:24 PM   #5338
Julf is offline Julf  Europe
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Originally Posted by mr_push_pull View Post
I guess he meant perfect as in as much as the scope's display allows, given certain timebase
"These claims are being made by people with cheap scopes with limited resolution"
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Old 4th November 2012, 07:26 PM   #5339
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Maybe some of us only listen to quadrophonic vinyl from the 70's
quite possible.
personally I have such varied musical tastes that I can't imagine myself in that position. music can deliver such a wide range of emotions that I find sticking to certain genres/time windows very restrictive in that regard. but I digress.
well...
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Old 4th November 2012, 07:39 PM   #5340
Julf is offline Julf  Europe
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Originally Posted by mr_push_pull View Post
personally I have such varied musical tastes that I can't imagine myself in that position.
I raise you a tuvan throat singer accompanied by 3 mustaphas 3 and one fake cuban conjunto doing kraftwerk covers...
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