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Multi-Way Conventional loudspeakers with crossovers

A Monster Construction Methods Shootout Thread
A Monster Construction Methods Shootout Thread
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Old 18th June 2020, 06:54 PM   #11
augerpro is offline augerpro  United States
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Yeah I'm going to try various distances and angles and see what looks most informative and consistent before I decide on a standard.
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Old 18th June 2020, 07:00 PM   #12
454Casull is offline 454Casull  Canada
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Quote:
Originally Posted by augerpro View Post
Yeah I'm going to try various distances and angles and see what looks most informative and consistent before I decide on a standard.
Sounds good. It's a bit like the trick of using a side-firing woofer to minimize the bass distortion in the direct field (90-degree off axis response on a woofer is a really good acoustic filter for H3 and up, depending on where you cross it). Works especially well when you would otherwise get distortion peaks due to cone breakup.

Last edited by 454Casull; 18th June 2020 at 07:03 PM.
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Old 18th June 2020, 07:17 PM   #13
puppet is offline puppet  United States
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A Monster Construction Methods Shootout Thread
Measuring the sound radiation of speaker cabinet walls


Might be some ideas in this article, too.
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Old 18th June 2020, 08:38 PM   #14
Pygmy is offline Pygmy  Netherlands
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For cabinet material, don't just stick to wood.

Slate stone, with its layered composition, dampens (damps? English is not my first language..) about 2.2 times more than MDF of the same thickness.

Boxenselbstbau - Gehausematerial - connect
(Article in german, use Google translate if needed)

Click the image to open in full size.
("Schiefer" is slate in german)

I've built multiple speakers (and for optics, my amp as well :-) using slate.

Click the image to open in full size.

The big towers (Heissmann Acoustics "Samuel HQ") use 2.8cm thick slate, which would come down to about 6cm MDF thickness :-)

They are DEAD :-)

Ordering it cut to size is pretty expensive, but I found out you can buy slate stone tiles pretty cheap (the small Needle speakers cost about $65 in tiles in total, 1.5cm thickness), and a $60 angle grinder and a $6 diamond blade cut through it like a hot knife through butter. I found it was just as easy to cut the slate tiles to size as it is to cut MDF!

It's heavy though - I build the big speakers horizontally on my bench, had to put them upright with help from my brother and had back-aches for two weeks after :-/
My guess would be they're at *least* 90kg a piece, maybe even over a 100kg...

Last edited by Pygmy; 18th June 2020 at 08:45 PM.
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Old 19th June 2020, 12:28 AM   #15
wolf_teeth is offline wolf_teeth  United States
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Add a surface 0.125" tempered HDF layer to the MDF or ply. It impresses me when I do that.
Wolf
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Old 19th June 2020, 12:35 AM   #16
wolf_teeth is offline wolf_teeth  United States
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Oh, and Roxul damping, also called safe n sound.
I also like rubber sport flooring and wool batting products. I doubt you can get 100% bamboo Naturfil anymore, but it was one of my favorites. Good ol' cotton balls for a cheap effective alternative. And maybe you can put the bubble-wrap mystery to bed...

I am rambling....
Wolf
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Old 19th June 2020, 01:16 AM   #17
augerpro is offline augerpro  United States
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Quote:
Originally Posted by wolf_teeth View Post
Add a surface 0.125" tempered HDF layer to the MDF or ply. It impresses me when I do that.
Wolf
I wanted to do that, thinking 1/4" HDF over 1/2" plywood might be a good combo but HD and Lowes were out of the HDF. It will happen though.
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Old 19th June 2020, 01:58 AM   #18
xrk971 is offline xrk971  United States
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A Monster Construction Methods Shootout Thread
Please add melamine foam sponges (BASF Basotect) as liner wherever you would use felt or denim.
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Old 19th June 2020, 02:07 AM   #19
augerpro is offline augerpro  United States
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Originally Posted by xrk971 View Post
Please add melamine foam sponges (BASF Basotect) as liner wherever you would use felt or denim.
Interesting. Know of a US source?
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Old 19th June 2020, 01:31 PM   #20
Pano is offline Pano  United States
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A Monster Construction Methods Shootout Thread
Search for melamine foam sheets. Often sold for sound treatment in 1/2" and 1" thickness. Also sold in small blocks as a sponge, like Magic Eraser.
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