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Old 6th October 2012, 08:23 PM   #27991
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Of course, PMA, and that is WHY we chose a very thick, aluminum case for the CTC Blowtorch. However, what is the REAL tradeoff between a plastic case, effectively lined with aluminum foil, and a thick aluminum case for protection against most of the usual airborne EMI? You should be an expert on this. I can just guess.
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Old 6th October 2012, 10:01 PM   #27992
fas42 is online now fas42  Australia
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It's a strange world, this hifi playground ....

Everyone claims they want "perfect" sound, yet many buy hideously expensive products that barely hint at achieving that goal. The very few that by various means reach high levels of performance by sensible approaches are ignored, laughed at or disparaged if they talk of their progress or methods. Most hifi enthusiasts publicly say it is unnnecessary to buy pretentious "name" products or components layered with glitz, "high class" parts and irrelevant bling, yet what are the biggest sellers ... ?

No wonder the youngies have no idea what we're on about, and couldn't be bothered joining in on the "fun" ...

Frank
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Old 6th October 2012, 11:22 PM   #27993
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Quote:
Originally Posted by john curl View Post

I can just guess.
i'd guess reduced microphonics.

only because i'm not currently using Bose® products ...
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Old 7th October 2012, 01:54 AM   #27994
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The Bose is a world class product ...

I think something can be world class for different reasons - different for Bose than JC's gear.
Well, John said that he "meant that it sold around the world as readily as here in the USA." Bose certainly fits that description.

se
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Old 7th October 2012, 02:00 AM   #27995
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Originally Posted by fas42 View Post
It's a strange world, this hifi playground ....

Everyone claims they want "perfect" sound, yet many buy hideously expensive products that barely hint at achieving that goal.
Always loved this definition from the late Gordon Holt's Audio Glossary:

accuracy The ultimate objective of an ideal sound system, which everyone claims to want but nobody likes when he has it.



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Old 7th October 2012, 02:07 AM   #27996
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Of course, MY definition is not all inclusive. However, it serves a purpose. For example, WHY would someone from Japan or Singapore ever care to buy humble product made in the SF Bay Area, like the Vendetta Research, without any direct ads, at least in the USA, and selling at 3 times the retail price as in the USA, in their respective country? Only a great review, from someone with dozens of choices to chose from, maybe several good reviews, will get their interest.
And how many of them were ever built and sold?

Quote:
Now, when I talk about 'listening contests' I normally mean exhibit demos at the CES, yearly.
So your "listening contests" took place at venues most everyone agrees offer the worst conditions for evaluating audio systems?

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This is where we tested our 'success'.
Rather than on how many people were actually willing to purchase the product?

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Old 7th October 2012, 03:39 AM   #27997
morinix is offline morinix  United States
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Would not a thin sheet of copper and a thin sheet of mu-metal separated by some plastic be a very good shield?
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Old 7th October 2012, 03:45 AM   #27998
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Both copper or mumetal have their problems. mumetal is non-linear. Thin copper like PMA is attempting to convey is not good for low frequency magnetic source emitted, screening. Only thick copper, aluminum, or silver will do, ultimately. BUT we are trying to save weight and money in this exercise.
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Old 7th October 2012, 04:30 AM   #27999
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> we are trying to save weight and money in this exercise.

Then make the chassis out of the circuit board ........
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Old 7th October 2012, 05:11 AM   #28000
BV is offline BV  Slovakia
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Mr. Curl, try to express distortion (magnitude and order) inherent e. g to CTC Blowtorch, and distortion (again, magnitude and order..) caused by Fe chassis... About -90dB vs -130dB, in both case low order, or?
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