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John Curl's Blowtorch preamplifier part II
John Curl's Blowtorch preamplifier part II
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Old 26th November 2012, 11:17 PM   #30001
Joshua_G is offline Joshua_G  Israel
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Originally Posted by john curl View Post
Gee, and I thought OPPO to be pretty good. Shows what I don't know.
Hi John,
How can the OPPO be that good, when you wrote:
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Originally Posted by john curl View Post
Well, I guess I will have to stick to SACD, DVD, etc. CD is sometimes OK, but not always.
Just goes to show how I can be so 'ignorant'. '-)
It seems to me that you do know, once you trust your ears.
 
Old 26th November 2012, 11:18 PM   #30002
Joshua_G is offline Joshua_G  Israel
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And it is, if you approach it without the chains of tradition and preconception.
So, how come most of the digital gear sound so crappy?
 
Old 26th November 2012, 11:31 PM   #30003
Esperado is offline Esperado  France
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So, how come most of the digital gear sound so crappy?
They do not.
Only the last stages: DACs.
No question of AC wires. Just perfect reclocking, perfect power supply for conversion linearity; good DACs and accurate analog stages. All that parts are expensive enough for manufacturers do not care too much about it, for an audience witch do not care or hear the difference.
As a DIYer, you can set only one in your system, all digital connections, and get rid of any problem. Nothing mysterious or complicated.

I wonder why John do not put his nose in it (it is so simple), and propose a digital preamp for his golden clients with the kind of sound he likes.

Last edited by Esperado; 26th November 2012 at 11:34 PM.
 
Old 26th November 2012, 11:39 PM   #30004
SY is offline SY  United States
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John Curl's Blowtorch preamplifier part II
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So, how come most of the digital gear sound so crappy?
Mostly, it's the recording and mastering; the playback gear has much less to do with it. With the few really good recordings out there, you get exactly what you're supposed to and the sound can be terrific. With other ones... well... you get the sound the producers intended with no low resolution media to plaster over the cracks. That may not be to your liking- it's certainly not to mine.
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Old 26th November 2012, 11:44 PM   #30005
Esperado is offline Esperado  France
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and the sound can be terrific.
Well said. More your system is good and sharp, less you find good enough records, as you can ear all defects. Even those that producers never listened in their recording studios. Who can afford Beatles remastered CDs ?

The old story of chemical photo VS digital 24Mpixels full frame bodies.

Last edited by Esperado; 26th November 2012 at 11:49 PM.
 
Old 26th November 2012, 11:45 PM   #30006
fas42 is offline fas42  Australia
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This way, CDs sound much better than the analog out of the OPPO, yet the CDs are barely tolerated this way, while they were highly enjoyable with CDP serving both as transport and DAC.

It is my experience that in audio everything matters, including power cable and interconnect cables. In digital audio, it is far more noticeable that everything matters.
Sounds that the designers of the AMR have learnt a thing or two. My suspicion is that the power supply of the Oppo is what's causing problems here ...

There's nothing really new under the sun: in HiFi News, many, many years ago, a key music reviewer couldn't stand CDs until he tried the first Stax CDP. Ah-ha, he said, finally, music!! And what had Stax done? They took a cheap and nasty Sanyo, all plastic inside, disabled its internal DAC and slung a metal box underneath to hold their own implementation of the DAC side of things, using a separate mains cord to power this box. No SPDIF link, they just fed the drive's signal through with a direct cable. And it made music, by virtue of optimising the crucial part of the mechanism in this simple fashion.

Frank
 
Old 26th November 2012, 11:56 PM   #30007
fas42 is offline fas42  Australia
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Mostly, it's the recording and mastering; the playback gear has much less to do with it. With the few really good recordings out there, you get exactly what you're supposed to and the sound can be terrific. With other ones... well... you get the sound the producers intended with no low resolution media to plaster over the cracks. That may not be to your liking- it's certainly not to mine.
Well, I'm going to vigorously disagree. My aim is for every, repeat, every recording to be "magic" to listen to, and this is achievable if one goes far enough along the way in optimising a system. There is a point where the human hearing mechanism kicks in to "plaster over those cracks" but it ain't gonna happen unless you go the yards, in tweaking a setup. At the halfway point, yes, most recordings sound pretty bloody awful, but that's because you're only at the halfway point ...

Frank
 
Old 27th November 2012, 12:12 AM   #30008
kgrlee is offline kgrlee
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Both AD797 and the supa stuff discussed in 'Discrete Opamp Open Design" need meticulous attention to earthing & decoupling. As does a 5532 or even NJM4558 to achieve their potential.
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4558?
I chose 4558 cos its a cheapo OPA that blitzes the Quan test and will probably do well on Hirata too. Unlike some Golden Pinnae stuff that doesn't.

4558s do vary. The NJM version is better than RC4558 which Quan tested in my experience for noise, slew & THD.

I'm with Frank. IMHO if you take meticulous care over important things like earthing & decoupling, cheapo stuff can beat Golden Pinnae stuff hand carved from Unobtainium by virgins.

JC, did you do the Hirata tests on Blowtorch? Don't disappoint us faithful.
 
Old 27th November 2012, 01:10 AM   #30009
john curl is offline john curl  United States
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4558?
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File Type: jpg 4558-fm1.jpg (444.2 KB, 262 views)
File Type: jpg 4558-fm2.jpg (363.1 KB, 238 views)
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Old 27th November 2012, 01:26 AM   #30010
kgrlee is offline kgrlee
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4558?
JC, thanks for pages 19 & 22 of Quan, 2012.

You might like to have a look at Table 17 on page 25 too.

Any news of your Hirata results for Blowtorch?

When are you going to do Quan's test on Blowtorch so we can compare with 4558 etc?

I'm sure it will do much better than this cheapo rubbish.
 

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