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Multi-Way Conventional loudspeakers with crossovers

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Old 25th December 2012, 11:11 PM   #911
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Originally Posted by dewardh View Post
I'd sure like to see the evidence of that in an end-driven pipe. I don't doubt that it happens if you put the driver on the side of a long thin box and try to run it full-range, though.
FR is what i mostly do, but the audiable issues are in voices, which have pretty much petered out by 1 kHz.

Here is an example (with a 2" driver in a 4" pipe it wasn't a big issue, it starts impinging with the 3" scan now in the pipe, and that will have more clearance than the pipe pictured above.)

Click the image to open in full size.

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Old 26th December 2012, 12:50 AM   #912
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Example of what impinging where with 2" driver v 3" driver in relation to question being answered regarding early reflections at rear of driver diaphragm at vocal formant frequencies in particular?
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Old 26th December 2012, 01:30 AM   #913
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Here is an example
Those pipes look rather short to avoid longitudinal reflection/resonances (which is what I suspect you are hearing). But in any case frequency response curves (which should show the ripple, wherever it is) would tell a lot more. Not to be too glib about it, but I don't see any evidence of lateral reflections in the pictures . . .
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Old 26th December 2012, 01:37 AM   #914
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Quote:
Originally Posted by dewardh View Post
Those pipes look rather short to avoid longitudinal reflection/resonances (which is what I suspect you are hearing). But in any case frequency response curves (which should show the ripple, wherever it is) would tell a lot more. Not to be too glib about it, but I don't see any evidence of lateral reflections in the pictures . . .
Damped till aperiodic. FR will not show the problems these have. Typically called cuppiness.

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Old 26th December 2012, 02:04 AM   #915
dewardh is offline dewardh  United States
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Quote:
Originally Posted by planet10 View Post
Damped till aperiodic.
Hard to do in that short a pipe.

Quote:
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FR will not show the problems these have. Typically called cuppiness.
I haven't heard "cuppiness" in any of the PLUTOs or PLUTO clones I've heard (including my own). Can't figure why your implementation as shown would have lateral reflections while none of the others do.
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Old 26th December 2012, 02:43 AM   #916
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Magic, same design in one case incurs significant trade off, and in other design works just fine.

Aperiodic tuning must be complete only after "Cuppiness" is tweaked out by ear?

What is good test setup for demonstrating "Cuppiness" that my ears may learn to hear something that can't be measured?

Regards,

Andrew
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Old 26th December 2012, 03:00 AM   #917
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... that my ears may learn to hear something that can't be measured?
There is an awful lot of stuff that can be heard that cannot be measured.

It is well accepted that 10,000 hrs of serious training are required to become really good at any endeavour.

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Old 26th December 2012, 03:04 AM   #918
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Bunk.
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Old 26th December 2012, 03:27 AM   #919
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Bunk.


That you would say that says alot...

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If the only tool you have is a hammer, everything starts looking like a nail.
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Old 26th December 2012, 03:44 AM   #920
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That you would say that says alot...



dave
OK, please show me a setup where one variable changes that produces an audible sound difference which cannot be measured with a microphone.

Anybody.

Regards,

Andrew
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