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Old 25th February 2014, 05:26 AM   #48581
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Quote:
Originally Posted by PMA View Post
Depends. In case of digital nastiness uncorrelated/correlated to program you will hear it even if lines (not SINGLE line) are about -90dB or less. Sounds like chirps, best heard with headphones during low level parts of music.
I have a player with digital noise at -90dB and it's easy to hear during quiet passages like you say, sounds like chirps.
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Old 25th February 2014, 05:29 AM   #48582
RNMarsh is online now RNMarsh  United States
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Originally Posted by Kindhornman View Post
Quad electrostatics having 100th the distortion of a normal moving coil speaker I have a hard time with that? Try and make any type of lower frequencies with them and tell me that is true.
For low bass... then, all bets are off. response is down 6dB at 30Hz. But still 100db at 1 meter spec is under <1% at 50Hz is excellent.

-RM

Last edited by RNMarsh; 25th February 2014 at 05:39 AM.
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Old 25th February 2014, 06:39 AM   #48583
RNMarsh is online now RNMarsh  United States
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I'll go out on a limb and state the QUAD is the lowest distortion speaker ever made.

66Quadfig10.jpg


Thx-RNMarsh
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Old 25th February 2014, 06:54 AM   #48584
gk7 is offline gk7
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This is the (older) ESL 63, or one of the new models the 2812 or the (bigger) 2912 ?
For the 2912 Quad claims an incredible 0.1% distortion for 100 Hz at 90dB/1m.

Last edited by gk7; 25th February 2014 at 06:57 AM.
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Old 25th February 2014, 06:59 AM   #48585
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What is the maximum SPL, at 100Hz? (for Quad)
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Old 25th February 2014, 07:00 AM   #48586
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Quote:
Originally Posted by RNMarsh View Post
I'll go out on a limb and state the QUAD is the lowest distortion speaker ever made.

Attachment 402168


Thx-RNMarsh
This is pretty good. What is that 8th??
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Old 25th February 2014, 07:41 AM   #48587
a.wayne is offline a.wayne  United States
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It would be nice to know which model in discussion RNM, the 63 tested many years ago had very low distortion, the new ones are supposedly better..
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Old 25th February 2014, 10:10 AM   #48588
marce is offline marce  United Kingdom
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Has not this fetish for burn in come from burn in testing that most life/mission critical equipment has to go through, it is a part of the specification for all class 3 based electronics I have worked on, and is to stress the whole assembly at the specified operating conditions including often severe changes of temperature...
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Old 25th February 2014, 10:57 AM   #48589
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Quote:
Originally Posted by RNMarsh View Post
Quite a bit lower...maybe a 100 times lower than 1%.

-RNM
Who are you kidding, you guys don't listen at "Quad" levels especially in the bass. Look I'm not talking about digital hash. Component non-linearities are inherently low order and HAVE to appear at the same frequencies as each other. The same argument that lots of them add up to audibility, could be used to claim removing any one of them is inaudible. You can't have it both ways i.e. removing one nasty magnetic resistor lifts a dozen "veils".
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Old 25th February 2014, 12:50 PM   #48590
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Quote:
Originally Posted by marce View Post
Has not this fetish for burn in come from burn in testing that most life/mission critical equipment has to go through, it is a part of the specification for all class 3 based electronics I have worked on, and is to stress the whole assembly at the specified operating conditions including often severe changes of temperature...
Yes it is related to the well-known (to some) 'bath tub' failure curve. Typically, electronics fail either very early (infant mortality) or very late in their life time (old age). So with burn in you want to weed out the infant mortality failings, which makes the rest work reliably for many, many years.
Has nothing to do with (sound) quality.

One thing I do find curious (or maybe not) is why burn-in always improves stuff, never makes it worse...

Jan
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