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Old 15th May 2014, 02:25 PM   #71
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Quote:
Originally Posted by AndrewT View Post
20Hz to 20480Hz is 10 octaves.
Three 3octaves capable drivers can't cover 10 octaves.
30Hz to 15360Hz is 9 octaves.

Four drivers each with AT LEAST 2.5octave capability can just reach 10octaves, if the overlap at each crossover is absolutely minimal.
It would seem that north of the border 'slightly more' means 'precisely the same'.
I have to bear that in mind next time I travel to Scotland. ;-)
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Old 15th May 2014, 02:30 PM   #72
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Old 15th May 2014, 02:55 PM   #73
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Unless I am mistaken the only speakers capable of really reproducing square waves are quad electrostatics. One can of course argue that this ability is irrelevant to sound reproduction but it's hard to see why that might be the case given that a good sq w is not possible without excellent phase and frequency fidelity. Both desirable attributes in sound reproduction.

Last edited by kasey197; 15th May 2014 at 02:57 PM.
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Old 15th May 2014, 03:56 PM   #74
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Hi and thanks. Very interesting.
I remember now an advert on HiFi News & Record Review, if i am not wrong, about a company building a passive multiway crossover able to pass a very decent SW.
I think that they presented this as a remarkable achievement
I do not remember the Company name by the way
Regards, gino

P.S. as i am also interested in coupling caps i wonder if a SW could be a good test signal to select the best caps for signal coupling
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Old 15th May 2014, 05:34 PM   #75
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Quote:
Originally Posted by kasey197 View Post
Unless I am mistaken the only speakers capable of really reproducing square waves are quad electrostatics...
Not so, some of the Danley Synergy horns (and some DIY versions, my own included) can do it as well. And something like the Manger, if used fullrange, can also.

One thing to keep in mind for most speaker measurements (including square wave reproduction capability) is that a speaker doesn't have just one output like an amplifier channel does. A speaker has many outputs that are almost always different toward every direction. Making a multi-driver, non-coaxial speaker reproduce a square wave only when measured from one direction (i.e. on some defined "listening axis") is difficult, but even when achieved probably still doesn't mean a heck of a lot. In a real room, you are going to hear all the sound outputs no matter what direction they are leaving the speaker at, as it will reflect around and get to you by some time (just turn a box speaker away from you and notice that the sound level really doesn't drop all that much, though the character of that sound probably will!).

Getting a speaker to reproduce a square wave (perhaps attenuated) over a wide range of output directions might mean something. But still I don't know of any documented evidence showing that that is necessary either.
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Old 8th June 2014, 12:18 PM   #76
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Originally Posted by bwaslo View Post
... Getting a speaker to reproduce a square wave (perhaps attenuated) over a wide range of output directions might mean something. But still I don't know of any documented evidence showing that that is necessary either
Hi and thanks for the very interesting explanation
The main reason for the question is what i read about drivers selection.
If i understand well most of this process is done by ear, by listening to signal/music. If i am wrong i am here to know.

And sorry but i find this quite unscientific. Again tell me if i am wrong.
I would expect that after all these years some kind of instrumental procedure were available, with well defined test signals.
I do believe in difference between one driver and another, starting from the cone material for instance. I prefer paper cones almost always.
Thanks and regards, gino

P.S. and drivers selection is the first step of a project. The first step.
I should study more drivers.

Last edited by ginetto61; 8th June 2014 at 12:24 PM.
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Old 26th June 2014, 06:23 AM   #77
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Hi, just to say that i have found a champion ... at least at 1 kHz

1kHz squarewave response on listening axis at 1m

Click the image to open in full size.

From Stereophile magazine.
I wonder if this behaviour is mantained also around that frequency.
Impressive.
I listened to these speakers and they amazed me for the realism of sounds, especially when reproducing special effects in movies.
I had an even scaring experience, never heard before.
We were watching a movie .. at a certain point a guy behind a glass wall knocked on it
I swear, i felt like he was inside the television knocking on the screen.
Unfortunately i do not remember the title of the movie but the effect was so real that both me and my friend, the owner of the speakers, were astonished.
Unbelievable. Was not a reproduced sound ... was the real sound.
Thanks and regards, gino

Last edited by ginetto61; 26th June 2014 at 06:25 AM.
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Old 26th June 2014, 07:53 AM   #78
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Hi Gino, which speaker is it you call the champion? :-)
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Old 26th June 2014, 10:18 AM   #79
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And what does that square wave look like with the mike moved a few cm?
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Old 26th June 2014, 12:04 PM   #80
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Originally Posted by Kastor L View Post
Hi Gino, which speaker is it you call the champion? :-)
Hi well champion maybe only on this specific issue.
It is the Quad esl 63
And there is only the test with a 1kHz SW.
Still it looks very good to me for a speaker.
As i said i listened extensively to these speakers because a friend owns a pair.
No real bass, limited max ouptut.
Someone call them the big headphones ...
I do not like at all their width ... in general i do not like panels
But the realism of some effects was completely unbelievable.
Like the crash of a glass ... never heard something more real really.
I do not know if this can be related to their behaviour in the SW response test
Thanks and regards, gino

Last edited by ginetto61; 26th June 2014 at 12:15 PM.
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