DIY....Nice design!

[robertcottiers]

Provided Link: http://www.diyaudio.com/forums/showthread.php?s=&postid=856870#post856870


I found this on the DIYAudio site...A very impressive DIY design.

Bob C.

scroll to the top to view:

[killerkowalczyk]

> I found this on the DIYAudio site...A very
> impressive DIY design.

> Bob C.

> scroll to the top to view:

very impressive, i was going to say that they reminded me of the Avalon Audio Sentinels. LOTS OF wasted wood and wood cutting but im sure it was worth it.

[nick29498141]

Thats a great clone!!!

Thats also some serious layered-lamination.

NK

[shawn_a]

I don't know what will kill him first though. Cheap Chinese cigarettes or the sawdust from all the cuts he had to make or the likely hernias resulting from trying to move those bad boys. Still very impressive.

How ya been Bob?

shawn

[robertcottiers]

> I don't know what will kill him first
> though. Cheap Chinese cigarettes or the
> sawdust from all the cuts he had to make or
> the likely hernias resulting from trying to
> move those bad boys. Still very impressive.

> How ya been Bob?

> shawn

Hi Shawn:I am doing just fine,I have put completion of my Line Arrays on hold till spring,I had to give up the use of the workshop so my son could rebuild his ATV...The nerve of that kid!!!...

I think I mentioned to you that my wife and I bought a second home in Bethlehem PA(Lehigh Valley),we have been going down on weekends to do some painting and we do some driving around to explore the new surroundings.

Gee, I almost forgot to mention the home has a huge basement, 46 ft long by 27 wide 7-1/2 foot ceilings...I wonder what I could do with all that space? :-)

Good to hear from You
Bob C.

[dlsbobby]

> Hi Shawn:I am doing just fine,I have put
> completion of my Line Arrays on hold till
> spring,I had to give up the use of the
> workshop so my son could rebuild his
> ATV...The nerve of that kid!!!...

> I think I mentioned to you that my wife and
> I bought a second home in Bethlehem
> PA(Lehigh Valley),we have been going down on
> weekends to do some painting and we do some
> driving around to explore the new
> surroundings.

> Gee, I almost forgot to mention the home has
> a huge basement, 46 ft long by 27 wide 7-1/2
> foot ceilings...I wonder what I could do
> with all that space? :-)

> Good to hear from You
> Bob C.
..where you have been. I thought those acitve crossovers you were building for the line array were giving you problems. Just kidding. I'm aware of your qualifications. Congrats on the house. Robert.

[robertcottiers]

> ..where you have been. I thought those
> acitve crossovers you were building for the
> line array were giving you problems. Just
> kidding. I'm aware of your qualifications.
> Congrats on the house. Robert.

Hi Bob:My MIA status on this board should be coming to an end by April.How far along are you with your arrays?,I am assuming you have completed your tiling of the basement .

Regards Bob C.

[bking]

The guy ripped off Avalon loudspeakers. He even used the pic off the Avalon site and is representing it as his own! Not to mention the poorly designed cabinet. Look at the woofer and mid range openings. The cabinet must be 3" thick and the inside of the driver openings aren't even scalloped! Those drivers are going to sound like they're in a tunnel.

[unknownuser]

> The guy ripped off Avalon loudspeakers. He
> even used the pic off the Avalon site and is
> representing it as his own! Not to mention
> the poorly designed cabinet. Look at the
> woofer and mid range openings. The cabinet
> must be 3" thick and the inside of the
> driver openings aren't even scalloped! Those
> drivers are going to sound like they're in a
> tunnel.

uhh...before the Avalon picture it says "his target is ....here" He was just using that so you could see what he is working toward...


(Originally posted by: DaveD)

[bking]

as you can see.

[mikebw]

Regardless of the design origin, I agree that the interior shape/dimension looks a little sketchy.
I can see where he is going with the whole diffuse wall thing, but I wondered how well the speaker would perform with that much restriction. How would you calculate the internal volume? Those cuts look to be random, which would be well suited for diffraction of standing waves, but that makes it that much harder to calculate.

His results are impressive, although I'd like to see how the finished product compares visually and acoustically.

> as you can see.

[bking]

...really isn't worth the effort for the negligible results. Some acoustic foam and the right amount of fill would accomplish the same thing.

[damkor]

> ...really isn't worth the effort for the
> negligible results.

Have you tried making slanted cabinets the other way?

Some acoustic foam and
> the right amount of fill would accomplish
> the same thing.

Not according to the science...that I read somewhere! Nothing beats correct box volume/shape.

[bking]

Talking about the convolutions in the interior of the cabinet, not cabinet shape..

[nick29498141]

You'd have to split them up into sections, I'd go as close to rectangular as I could, then calculate each section, assuming that each piece of MDF (or HDF which would work for this large of a project) and add them up. not all that hard, but very time consuming.

NK

[dlsbobby]

> Hi Bob:My MIA status on this board should be
> coming to an end by April.How far along are
> you with your arrays?,I am assuming you have
> completed your tiling of the basement .

> Regards Bob C.
Have you been talking to my wife? I'm almost done. I keep telling her perfection is not accomplished overnight. I still really haven't decided on a tweeter yet. I heard the Dayton Neo's at DIY Dayton and they were a little harsh. Now, I have no idea what crossover was in there but I just might save up for something better. Let me know what you think of the Neo's. Have fun, Robert.

[damkor]

> Talking about the convolutions in the
> interior of the cabinet, not cabinet shape..

OK. I've done this method to make spherical cabinets. Once you cut the pieces, the layers as it were, you have to cut out the middles. When you do this, it's pretty much just as easy to cut them into funny shapes as not.

[Andy_G]

> When you do this, it's pretty much
> just as easy to cut them into funny shapes
> as not.

Using a jigsaw, its easy to cut funny shapes !! and very hard to cut accurate ones !!

[jimt]

> You'd have to split them up into sections,
> I'd go as close to rectangular as I could,
> then calculate each section, assuming that
> each piece of MDF (or HDF which would work
> for this large of a project) and add them
> up. not all that hard, but very time
> consuming.

> NK

Actually, it's very easy. Just find the density of your wood, and calculate how much weight equals the volume you need to remove. Then weigh the pieces before and after cutting. Quite simple.