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Old 17th January 2006, 11:09 PM   #181
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Ahhh, aren't they cute.

What did you do to the cones?

How come you're so cheap with the screws?
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Old 18th January 2006, 01:02 AM   #182
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lol as far as the screws go... the theme was leftovers... i used scrap mdf, scrap veneer, and $3 dollars worth of speakers. i couldnt justify any money on screws so i just grabbed some i had layin around.

for nsb mods.. i coated them in elmers glue/water solition, and burned a small hole in the dust cap. i want to eventually put phase plugs in them. for $3 im very satisfied
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Old 18th January 2006, 01:18 AM   #183
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That's interesting. It looks shinier than I would expect, but I guess it's the flash.
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Old 18th January 2006, 03:07 PM   #184
soongsc is offline soongsc  Taiwan
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Quote:
Originally posted by gpapag
(continued)
It has ended up sounding balanced, no boxiness at all, bodied, non fatiquing and pleasantly heard from other rooms of the house (two floored). Family-wife and two daughters-fell in love with them (i.e. they tend to use them as well).
See next
George

Just curious, have you measured the response? I would expect slight drop in the higher frequencies even though the JX92 itself has a rise.
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Old 18th January 2006, 07:31 PM   #185
gpapag is offline gpapag  Greece
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Hi all
I apologize to soonqsc and Rudolf for not responding so far. (I am in the process of recovering my home PC after a malicious infection. Three days ago i disabled the firewall for a minute and ...you can imagine. It seems that this year I am going to fight a lot with PC troubles. Four hours before the New Year's Eve my hard disk crashed. The next two days i was playing the fach-idiot!). I was watching the forum from my work PC though.
So, I have not measured the response yet. But you can safely bet that there is such a drop. This speaker placement can provide this benefit. I don't like listening to JX92S on axis.
Now as you know, the amount of dropping depends on some factors: reflecting/arbsorbing properties of reflector (form of reflector, geometric details of reflector, material of reflector, surface finish of reflector, placement of reflector relative to driver), reflecting/arbsorbing properties of surfaces close to reflector (upper surface of speaker box, walls).
Some of these factors work uniformly across a large part of the frequency spectrum, some are more selective.
Up to now I have tried 4 reflector types and a few variations on each. The one that you saw on the picture is one variant of the cone type.
It has some good virtues (massive, easy to fabricate, looks good), but many things are under consideration and investigation.
For start, the angle that Rudolf questioned. It is 55 degrees. Cone's height is 290mm (910mm upper periphery) Not a gold angle or proportion, nor optimized. I made a rough choice based on the assumption that this cone will not act as an “abrupt” surface in front of the driver and that it will not reflect much of the sound back against the driver and the upper side of the box. Indeed, compared to another cone I tried (90 degrees, height 200mm) it sounds more “open”, but this is not conclusive due to differences in materials used. Later on, I will make a 90 d. with the same materials.
Other forms of reflectors are more focusing, thus more acoustically “efficient” but quite difficult to fabricate as rigid structures and aesthetically acceptable at the same time. Some are less diffraction prone. I will keep on working on this for a long time, I know.
Another open topic is the use of an electronic filter. I have not tried any yet. I will settle for a certain reflector first.
This was meant to be an entertaining as well as a multidiscipline educative project.
Regards
George
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Old 18th January 2006, 11:05 PM   #186
soongsc is offline soongsc  Taiwan
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Quote:
Originally posted by gpapag
Hi all
I apologize to soonqsc and Rudolf for not responding so far. (I am in the process of recovering my home PC after a malicious infection. Three days ago i disabled the firewall for a minute and ...you can imagine. It seems that this year I am going to fight a lot with PC troubles. Four hours before the New Year's Eve my hard disk crashed. The next two days i was playing the fach-idiot!). I was watching the forum from my work PC though.
So, I have not measured the response yet. But you can safely bet that there is such a drop. This speaker placement can provide this benefit. I don't like listening to JX92S on axis.
Now as you know, the amount of dropping depends on some factors: reflecting/arbsorbing properties of reflector (form of reflector, geometric details of reflector, material of reflector, surface finish of reflector, placement of reflector relative to driver), reflecting/arbsorbing properties of surfaces close to reflector (upper surface of speaker box, walls).
Some of these factors work uniformly across a large part of the frequency spectrum, some are more selective.
Up to now I have tried 4 reflector types and a few variations on each. The one that you saw on the picture is one variant of the cone type.
It has some good virtues (massive, easy to fabricate, looks good), but many things are under consideration and investigation.
For start, the angle that Rudolf questioned. It is 55 degrees. Cone's height is 290mm (910mm upper periphery) Not a gold angle or proportion, nor optimized. I made a rough choice based on the assumption that this cone will not act as an “abrupt? surface in front of the driver and that it will not reflect much of the sound back against the driver and the upper side of the box. Indeed, compared to another cone I tried (90 degrees, height 200mm) it sounds more “open? but this is not conclusive due to differences in materials used. Later on, I will make a 90 d. with the same materials.
Other forms of reflectors are more focusing, thus more acoustically “efficient?but quite difficult to fabricate as rigid structures and aesthetically acceptable at the same time. Some are less diffraction prone. I will keep on working on this for a long time, I know.
Another open topic is the use of an electronic filter. I have not tried any yet. I will settle for a certain reflector first.
This was meant to be an entertaining as well as a multidiscipline educative project.
Regards
George
The drop in high frequency would be due to different energy dispersion pattern from mostly 30 degrees within the speaker center to many more time the surface area.

You have the right concept on the angle, I don't think you will get better performance with the 90 degree configuration. I properly shaped parabolic curve might give slightly better performance, this is where it becomes a bit tricky.
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Old 19th January 2006, 09:44 AM   #187
Fuling is offline Fuling  Sweden
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Soon they will play some music!
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Old 19th January 2006, 08:12 PM   #188
Rudolf is offline Rudolf  Germany
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Quote:
Originally posted by gpapag
I apologize to soonqsc and Rudolf ...
No need to do so, Georg. I hope the worst of this year already lays behind.
And thanks for that in-depth explanation.
Quote:
Now as you know, the amount of dropping depends on some factors: reflecting/arbsorbing properties of reflector (form of reflector, geometric details of reflector, material of reflector, surface finish of reflector, placement of reflector relative to driver), ... Up to now I have tried 4 reflector types and a few variations on each.
All arguments agreed upon
People are rare that look deeply into cone design for omnidirectional dispersion. So I´m looking very much forward for the final results you may find. Hope you will publish them here.

Keep the project entertaining and educative for all of us.

Regards
Rudolf
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Old 23rd January 2006, 03:49 AM   #189
maxro is offline maxro  Canada
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Hi folks,

Here's my first DIY speaker project. FR125S in a pair of mass-loaded, tapered transmission line, bipoles. (Would that be CSSFR125SMLTTLBP?) I used one 5x5' sheet of Baltic birch with minimal leftovers.

I went for wide and shallow, to keep the drivers close to each other, thinking that might reduce bipole phase issues. Also, I like the wide look and it encroaches less into my living room.

I'm still playing around with stuffing the port with foam, though it doesn't seem to be making a huge difference. I have yet to get the drivers to show any signs of over-excursing from frequencies below the tuning frequency. I did tune them very low however, as I wanted a gentle roll off rather than flat-then-plummet response.

Many thanks to DIY Audio for ideas and to MJK for his worksheets.

Here's a photo from my apartment hallway. I'm afraid my living room is a candidate for the "how messy is your office" thread at the moment.

Max
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Old 23rd January 2006, 03:54 AM   #190
maxro is offline maxro  Canada
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Oops, that was the drawing, which I was going to put in this post. Oh well, here's the photo:

Max
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