John Curl's Blowtorch preamplifier part II - Page 3425

scott wurcer · 5th February 2013, 06:24 PM

Quote:

Originally Posted by Esperado

I'm saving money to can buy a Townshend super tweeter

Specification:-
Freq. response: 20Khz to 70kHz (-3db) 12kHz to 90kHz(-6dB)
Sensitivity Adjustable to suit speakers with sensitivity from 80dB to 110dB.
Impedance 6R, 20Khz. 30R, 100kHz.
Power rating. 350W+. Music (heavy rock)
Dimensions. 50mm (W), 30mm (H), 100mm (D).
Case. Stainless Steel Mirror

SY · 5th February 2013, 06:32 PM

There's a very nice car talk thread in The Lounge...

gk7 · 5th February 2013, 06:33 PM

Quote:

Originally Posted by SY

... a more extensive background in experimental psychology.

You do ?

myhrrhleine · 5th February 2013, 06:37 PM

...and here are (self-censored) who claim to be annoyed by the 7th or 9th
harmonic at > -120 dB.
120 dB is the attenuation of a radio signal from here to the moon, to put
it in perspective. Or a jet engine at 30m distance to hearing threshold.

I don't recall anyone saying that they were annoyed by the 7th harmonic at -120db.
Can you give the reference link?
I do recall 7th harmonic being used as a guideline for measurement of quality.

Kindhornman · 5th February 2013, 07:25 PM

So do you put that brick wall filter before the TownShend tweeter to remove the upper frequencies so you don't have to hear that objectionable high frequency response?! Just goes to show you how opposing the theories are and what can be done. But I would sure like to know where the 24Khz and above material is supposed to be sourced from? Seems we have a quandary here, those who want upper end extension and those who profess that anything over 16Khz is just noise..... I'll stick with my thoughts that the experimenters have used devices that were just incapable of producing the upper frequencies without unwanted resonant breakup noise and distortion.

Kindhornman · 5th February 2013, 07:28 PM

Sy,
I just get peeved when so many knocked US based engineers as inferior. If that was the case why do so many come here to get educated. Our problem is we teach some of the best engineers and then tell them they have to go home now. Stupidist immigration policy if I ever saw one.

SY · 5th February 2013, 07:31 PM

Quote:

Originally Posted by gk7

You do ?

15 year member of APS, and ran research programs in haptics and organoleptics for 20 years, if that counts.

Quote:

Originally Posted by Kindhornman

Sy,
I just get peeved when so many knocked US based engineers as inferior.

I've had some superb American engineers go through my groups. So you won't hear that from me. Where's the Papuan Bob Widlar?

PMA · 5th February 2013, 07:36 PM

Quote:

Originally Posted by john curl

Jack Bybee is just fine. He has received a prototype of our latest switching power supply, high feedback power amplifier, and is very happy with it. This is the one we have worked on for years, now.
Last night I contacted him that the BBC channel was showing a new Bentley that goes as fast as his Bentley (205 mph, tested) and the Top Gear guys put it into a rally, which was really fun to watch. Jack and I discussed it, after the rally was run. Jack told me that his Bentley has even more HP than the new Bentley. One of his old sidelines.

Thanks for the update!

gk7 · 5th February 2013, 07:38 PM

How would organoleptics relate to experimental psychology ? But ok, this is OT ayway ...

SY · 5th February 2013, 07:40 PM

That's exactly experimental psychology. Sensory science is a very active research area. And that's exactly what this paper was about.

5th February 2013, 06:32 PM	#34242
SY diyAudio Moderator Join Date: Oct 2002 Location: Chicagoland Blog Entries: 1	There's a very nice car talk thread in The Lounge... __________________ If there's a sucker born every minute, where do the rest of them come from?

5th February 2013, 06:37 PM	#34244
myhrrhleine diyAudio Member Join Date: Jan 2006 Location: Avalon Island	...and here are (self-censored) who claim to be annoyed by the 7th or 9th harmonic at > -120 dB. 120 dB is the attenuation of a radio signal from here to the moon, to put it in perspective. Or a jet engine at 30m distance to hearing threshold. I don't recall anyone saying that they were annoyed by the 7th harmonic at -120db. Can you give the reference link? I do recall 7th harmonic being used as a guideline for measurement of quality. __________________ Just because you can't hear it doesn't mean no one can.

5th February 2013, 07:38 PM	#34249
gk7 diyAudio Member Join Date: Oct 2007 Location: Vienna / Austria	How would organoleptics relate to experimental psychology ? But ok, this is OT ayway ... __________________ Regards, Georg

5th February 2013, 07:40 PM	#34250
SY diyAudio Moderator Join Date: Oct 2002 Location: Chicagoland Blog Entries: 1	That's exactly experimental psychology. Sensory science is a very active research area. And that's exactly what this paper was about. __________________ If there's a sucker born every minute, where do the rest of them come from?

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5th February 2013, 07:25 PM	#34245
Kindhornman diyAudio Member Join Date: Aug 2012 Location: Los Angeles, California	So do you put that brick wall filter before the TownShend tweeter to remove the upper frequencies so you don't have to hear that objectionable high frequency response?! Just goes to show you how opposing the theories are and what can be done. But I would sure like to know where the 24Khz and above material is supposed to be sourced from? Seems we have a quandary here, those who want upper end extension and those who profess that anything over 16Khz is just noise..... I'll stick with my thoughts that the experimenters have used devices that were just incapable of producing the upper frequencies without unwanted resonant breakup noise and distortion.

5th February 2013, 07:28 PM	#34246
Kindhornman diyAudio Member Join Date: Aug 2012 Location: Los Angeles, California	Sy, I just get peeved when so many knocked US based engineers as inferior. If that was the case why do so many come here to get educated. Our problem is we teach some of the best engineers and then tell them they have to go home now. Stupidist immigration policy if I ever saw one.

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