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Multi-Way Conventional loudspeakers with crossovers

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Old 7th March 2013, 03:53 PM   #11
gedlee is offline gedlee  United States
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Quote:
Originally Posted by markus76 View Post
How large are the screenshots in pixels? Resize them, save as JPGs and add them as an attachment to your post.
You can link those attached files in your post by clicking on the "Insert Image" button:
What size image files can be loaded? So to get jpg's you use Photoshop?
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Old 7th March 2013, 03:58 PM   #12
gedlee is offline gedlee  United States
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Originally Posted by markusA View Post
I can't give you anything about details but he does all the programming himself and he seems like a pretty openminded guy and would probably enjoy the discussion if you tracked him down.

quarter-wave.com is his site.
I could not find anything on rooms there.

I use MathCAD a lot, I am very good at it, but its graphics are borderline terrible. Over the years I have developed a failry good set of graphics in VB.NET from which I can ssemble just about anything that I want done exactly the way I want it. PolarMap is a good example. I'll post some screen shots later today.
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Old 7th March 2013, 04:01 PM   #13
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I do but why not use something simpler? Just make sure pictures don't get too wide pixelwise. I'd aim for about 800 pixels.

Click the image to open in full size.
Attached Images
File Type: png Screen Shot 2013-03-07 at 18.00.26.png (8.8 KB, 1096 views)
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Old 7th March 2013, 05:10 PM   #14
gedlee is offline gedlee  United States
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I have Photoshop - what else is "easier"? My screen is four or five times more than 800 x 600 and then into jpg and the shots might be hard to read.
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Old 7th March 2013, 05:12 PM   #15
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Originally Posted by gedlee View Post
I have Photoshop - what else is "easier"? My screen is four or five times more than 800 x 600 and then into jpg and the shots might be hard to read.
You don't want to post the content of multiple screens do you? I guess only a single window is of interest, no?

If you have PS there's no harm in using it.

Last edited by markus76; 7th March 2013 at 05:15 PM.
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Old 7th March 2013, 05:26 PM   #16
gedlee is offline gedlee  United States
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Trial 1
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File Type: jpg shot1.jpg (93.6 KB, 517 views)
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Old 7th March 2013, 05:30 PM   #17
gedlee is offline gedlee  United States
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Hey it works. Still some bugs, the listener location shown there is in pixels and needs to be converted into meters based on the room size.

I'll start posting some examples when I get the bugs out.

Everything you see updates immediately so you can actually see how the imaging and frequency response changes as you change the toe-in. "dipole" is to normaize at a higher frequency to keep the plots on scale.

Note that total range of the frequency response is only 18 dB - this will become evident with some other speakers.
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Old 7th March 2013, 05:32 PM   #18
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I'm not sure if this is directly related, but Wayne Parham of PiSpeakers has often advised to cross speakers (uniform directivity) a foot or two in front of the listeners to "widen the sweet spot."

The reasoning I believe is that, because of off-axis falling response, as a listen moves to the right they are actually moving more on-axis for the left speaker. More on-axis, more 'volume.' This pulls the image back to the centre.

Here's a link to his FAQ where he discusses it:

AudioRoundTable.com: Pi Speakers => Imaging, placement and orientation

There's some great graphics: (Wayne) "One enthusiast that posts under the pseudonym publius took time to illustrate the orientation and the pattern that results."

Cheers,
Jeff

Last edited by AudioLapDance; 7th March 2013 at 05:34 PM.
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Old 7th March 2013, 05:44 PM   #19
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Quote:
Originally Posted by AudioLapDance View Post
I'm not sure if this is directly related, but Wayne Parham of PiSpeakers has often advised to cross speakers (uniform directivity) a foot or two in front of the listeners to "widen the sweet spot."
The technique is actually pretty old. I think Bauer was the first to describe it a couple of decades ago. Problem is that it doesn't work (for me, in my room).
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Old 7th March 2013, 05:51 PM   #20
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Here's how I post pics:

Screenshot:

hit 'print screen' button
open MS Paint (universal!)
hit 'paste'
use 'crop' to zoom-in on area of interest
(to change view to crop large areas, click on 'view' tab (Win7) and 'zoom out')

[I tend to leave them as big as possible so people can zoom in for details...but if you want to change the size ...]

hit 'resize' and click the 'pixel' button and enter '800' in the horizontal field


Do a 'save as', name it, choose .png or .jpg and put it on your desktop (or where ever). Put it in yer post!



Pic:

Get it to your desktop, open it in paint and follow the same process.



Cheers,
Jeff
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