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Multi-Way Conventional loudspeakers with crossovers

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View Poll Results: Will MJL21193's crazy design work as proposed?
Yes 57 51.35%
No 7 6.31%
Maybe. 34 30.63%
I'll laugh when it doesn't. 13 11.71%
Voters: 111. You may not vote on this poll

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Old 27th January 2010, 10:02 PM   #111
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Quote:
Originally Posted by mondogenerator View Post
what a drum like sound boat hulls make.
Eeh, high density polyurethane foam is used in fast aluminum boats to dampen engine and wave slamming vibrations.
(just wait till the screw propeller starts to cavitate)
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Old 27th January 2010, 10:10 PM   #112
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Quote:
Originally Posted by infinia View Post
Now you are going the right direction. If'n it were me I'd steal some ideas from the 18Sounds kit 8" 2 way with 80x60 horn but minus the baffle step.
Looks good, thanks for the suggestion.
Baffle step can be handled actively, as these speakers will be active. Crossover points yet to be determined - measuring response and adjusting on the fly with the DCX2496.

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Originally Posted by FrankWW View Post
Those panels are cute! Very sharp execution of I-beam principle. Over kill, of course
I'm all about overkill! Thanks

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Originally Posted by SaSi View Post

I am wondering if you plan to employ bracing inside the enclosure. The curved panels will make cutting and fitting the braces more complex.

Another issue that I was thinking regarding panel construction is how to make them identically symmetrical.
The idea is to not use extra bracing, that these panels should be stiff enough on their own. Time will tell - I won't hesitate to use extra bracing but only if it is needed.
Fitting the panels together will be a challenge anyway. A slight difference in symmetry would make a difference if I were to miter the corners. Since I plan on coping the corners together, it shouldn't be a problem.
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Old 27th January 2010, 11:20 PM   #113
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Quote:
Originally Posted by 5th element View Post
If it works for them it should work for you John Stiff, light and strong.
Thanks 5th,
You are obviously a learned man of discriminating taste and enlightenment!


Quote:
Originally Posted by Brett View Post
I think you can do much better than either of them.I have no idea on where you're thinking of xover points, or budget, so not quite sure what to suggest.
This is always true but there are limits to every project. The 6A has the efficiency I want and the FR looks reasonable. I'm not one of those people that think that if it's good, it has to be expensive. As for budget, I don't really have one, just burn up cash as I go along but try to keep it within reason.
As mentioned above, I don't know what the crossover points are yet myself. Part of the fun will be "dialing" these in actively.

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Originally Posted by Brett View Post
You're going to have to engineer that yourself and it's going to need CNC most likely to get the shape correct. It will be interesting to see.
Where do you plan on x-ing it? Lower than 2k, depending on flare loading looks like a no-no.
Moving to a compression driver is something I've been meaning to try and this is a good opportunity.
The horn flare will not be a problem to construct - I won't need a CNC (there were and are people that can fabricate accurately without them) and I'll try to go through the process with a few pics to show what I'm doing. I'm a bit pressed for time right now with a few different things happening but I may find time on the weekend to get started on the flare..
I don't want to cross the HF driver too low - 2-2.5k is where I want to be.
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Old 27th January 2010, 11:45 PM   #114
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Quote:
Originally Posted by mondogenerator View Post
I like where youre going with the panels....foam would be tempting but i have heard what a drum like sound boat hulls make, however rigid they may be.

Had you considered fiulling cavity with polyester resin mixed with the hollow glass spheres that GRP fabs use to lighten some structures? I wouldve thought that would be mega stiff and light, though not as light as foam, and may well be miles better.

just an idea, otherwise, loving the concept.
Thanks,
I think that the foam will be as good a fill material as any, for the design objective (lightweight, extra stiff). It has some "give" which is probably better than a complete solid as far as sound is concerned. Would something like sand be better? - most likely but it would be very heavy and I want to be able to move these and not have to reinforce the floor to hold them up.
Not mentioned yet is the other advantage of this panel shape: no real parallel surfaces, both inside the enclosure and inside the panels.

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Originally Posted by Cal Weldon View Post
You called?

THAT'S what I was talking about!
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Old 28th January 2010, 12:27 AM   #115
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Quote:
Originally Posted by MJL21193 View Post
THAT'S what I was talking about!
THAT makes me somewhat nervous.
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Old 29th January 2010, 03:47 AM   #116
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Quote:
Originally Posted by 5th element View Post
THAT makes me somewhat nervous.
What about his neighbours?

Foam should be at my door early next week. THEN the fun begins.
I have been thinking that I will make the baffle a bit more elaborate than pictured earlier. The body of these speakers will be veneered, with the back and the baffle painted. I'm looking to do a marble / granite effect in the paint - something a bit different.
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Old 29th January 2010, 09:42 PM   #117
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Originally Posted by MJL21193 View Post
What about his neighbours?
Cal's Neighbours relocate whenever he turns the sound on. Not by choice mind you, but their houses get physically pushed away by the wall of sound.

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Originally Posted by MJL21193 View Post
THEN the fun begins.
Don't you mean then the mess begins?

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Originally Posted by MJL21193 View Post
I'm looking to do a marble / granite effect in the paint - something a bit different.
I've always wondered about making loudspeakers out of polished marble, it'll be interested to see how this turns out looking. I'd be tempted to marble effect the entire cabinet.

Edit - that's if it's someone else is finishing the cabinets for me. If it's me I'll stick with MDF >.<
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Old 30th January 2010, 12:40 AM   #118
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Quote:
Originally Posted by 5th element View Post

Don't you mean then the mess begins?



I've always wondered about making loudspeakers out of polished marble, it'll be interested to see how this turns out looking. I'd be tempted to marble effect the entire cabinet.

Edit - that's if it's someone else is finishing the cabinets for me. If it's me I'll stick with MDF >.<
Making a mess is fun too.

I like to experiment with finishes. I did a big table a few (hundred) years ago that was a dead ringer for marble, at least from a distance
For this I will try to be a bit more sophisticated in my approach and do some samples before I proceed. To get a more "real" granite effect, I have mica flakes to mix in. Black base, black candy with the mica and several coats of clear to give it depth.
More fun
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Old 30th January 2010, 03:45 AM   #119
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Default Impressed....

I have to say I'm impressed with the thought put into the cabinet design. And you even thought out the construction in detail as well. I convinced it will work the way you think it will. Most of the naysayers seem to have fallen away. I voted "It'll Work" early.

The poll is closing soon. Remember folks, vote early, vote often!
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Old 31st January 2010, 08:28 PM   #120
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Thanks again fellas!
It is strikingly like a basin A bit on the small side though.
Just about the right size for Holy Water...Amen.

It is taking forever for that casting to dry out. I may as well put my enthusiasm on hold for at least a day or two and let it dry.
Unfortunately, work in all it's glory calls tomorrow and I won't get anything "important" done. On a bright note, my foam may arrive and I get to look at that when I get home.

I've modified the front baffle some. The concept:

118.jpg

Somewhat more interesting looking I think.
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