Took some pictures of my first subwoofer today. It's a Peerless XLS based design with one 12" woofer and two 625g PR's. The box is aprox. 50 liters and built out of 60mm thick MDF. Behemoth is a suitable name for it. Unfortunately I forgot the camera at work so pictures won't be up until tomorrow.
Actually some commercial high end speakers build cabinets that thick. Here is one:
http://www.equinoxaudio.com.au/products/speakers/jupiter.php
Vaf signature speakers are up to 52mm thick
http://www.vaf.com.au/detail.asp?audio=signature&grunt=I11i26719
I'd do some pretty serious bracing before going that thick though. I think 36mm is a good thickness. My mains are up to that thick with bracing and they are nice and dead, but my subs are 18mm thick (unbraced test boxes) and they vibrate like mad!
http://www.equinoxaudio.com.au/products/speakers/jupiter.php
Vaf signature speakers are up to 52mm thick
http://www.vaf.com.au/detail.asp?audio=signature&grunt=I11i26719
I'd do some pretty serious bracing before going that thick though. I think 36mm is a good thickness. My mains are up to that thick with bracing and they are nice and dead, but my subs are 18mm thick (unbraced test boxes) and they vibrate like mad!
Actually I'd say its a balance of bracing and enclosure thickness.
Those VAF speakers I have actually heard in their showroom/headquarters and they are very accurate speakers. I've heard diy speakers using seas excel drivers but the vaf versions are extremely accurate and this suggests to me that they got something right. Although I find they are accurate to the point of being unforgiving. No doubt the equinox aren't that thickness throughout, however thickness is one area where commercial speakers rarely contain overkill, as they have to be shipped.
Those VAF speakers I have actually heard in their showroom/headquarters and they are very accurate speakers. I've heard diy speakers using seas excel drivers but the vaf versions are extremely accurate and this suggests to me that they got something right. Although I find they are accurate to the point of being unforgiving. No doubt the equinox aren't that thickness throughout, however thickness is one area where commercial speakers rarely contain overkill, as they have to be shipped.
Here are the pictures
sorry for the delay, but here you have it
you can browse the rest of the pictures here:
http://81.226.208.126/sub/
sorry for the delay, but here you have it
An externally hosted image should be here but it was not working when we last tested it.
you can browse the rest of the pictures here:
http://81.226.208.126/sub/
Re: Here are the pictures
Regardless of the debate about wall thickness, your workmanship on the enclosure should be commended. What are you going to finish it with?
Mikael Abdellah said:sorry for the delay, but here you have it
An externally hosted image should be here but it was not working when we last tested it.
you can browse the rest of the pictures here:
http://81.226.208.126/sub/
Regardless of the debate about wall thickness, your workmanship on the enclosure should be commended. What are you going to finish it with?
I wish Icould take credit for building it, but I went to a local company that builds wooden furniture and asked the to build it for me. They did a fantastic job. The also lacquered (?) it for me. It turned out better than I could ever have imagined. I'll post post pictures of the finished sub as soon as it is assembled. Right now it looks as if the dampening material is out of stock until late january, so it may not be finished until some time in february.
Re: Here are the pictures
Hi,
I don't manage to get a website when using this link. I really would like to see those images. At the moment I'm also making a sub out of 30mm thick MDF for my Peerless xls12 + PR (425gr).
I will use this plate amp.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=56706
Greetz
Ben
Mikael Abdellah said:sorry for the delay, but here you have it
An externally hosted image should be here but it was not working when we last tested it.
you can browse the rest of the pictures here:
http://81.226.208.126/sub/
Hi,
I don't manage to get a website when using this link. I really would like to see those images. At the moment I'm also making a sub out of 30mm thick MDF for my Peerless xls12 + PR (425gr).
I will use this plate amp.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=56706
Greetz
Ben
This article is about construction but explain this effect a bit.
http://irc.nrc-cnrc.gc.ca/pubs/cbd/cbd239_e.html
If you look at the Table #1 you see that plywood (dunno which genre) got a A constant of 21700 Hz/mm.
So for 3/4" plywood or 19mm you get a resonance at 21700/19 = 1142 Hz, for 2" thick you would have a resonance at 434 Hz.
I will search for better articles than this one.
http://irc.nrc-cnrc.gc.ca/pubs/cbd/cbd239_e.html
If you look at the Table #1 you see that plywood (dunno which genre) got a A constant of 21700 Hz/mm.
So for 3/4" plywood or 19mm you get a resonance at 21700/19 = 1142 Hz, for 2" thick you would have a resonance at 434 Hz.
I will search for better articles than this one.
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