Completed build, for inspiration.. - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 21st October 2011, 07:49 PM   #1
Elbert is offline Elbert  Norway
diyAudio Member
 
Join Date: Mar 2008
Default Completed build, for inspiration..

Finally, after many months of protracted building and finishing..

Anyway, now Im' finished, and I thought I'd give something back to the forum in the form of som images and descriptions, hopefully to inspire others!

I decided I wanted a system that could cover all 10 octaves, and decided to go with dual subwoofer/ two way "satelites" actively driven. Posted some other threads on the amp and x-over design...

I decided to go for the Dayton RS39HF 15" woofers:

Dayton Audio RSS390HF-4 15" Reference HF Subwoofer 4 Ohm 295-468

They are in my opinion very good value for money and had a very low Fs, meaning it should be possible to go deep even with a closed box.

I must say that the build quality of these woofers were in deed excellent.

I chose closed boxes as this would give better phase response, plus it would be simple to simulate and predict.

A volume of around 160L gave a simulation of a slightly highish Q, but with the etensive stuffing I employed, my qualified quess is that I ended op fairly close to 0,7 anyway. Simulations allso showed that variations in response were quite modest ovver a relatively wide range of volumes about the calculated ideal. So in other words, not a very critical design.

I decided to go for a wide and low profile, making the enclosures less dominant in the living room, more like furniture than big loudspeaker boxes. The dimensions should make it easy to "blend" them in as a natural horizontal extension of a low stereo/ TV console.

I decided to build them from 22mm MDF with a heavy bracing matrix inside.

I allso decided to place them on a foot made from a 22mm MDF panel slightly smaller than the bottom og the boxes. Yhis effectively hides any missalignments and unevenness that would otherwise become evident if flush. Between the foot and the box, I sandwiched a sheet of 12mm thick "Armaflex" a mushy and elastic sort of cloced cell foam used for HVAC insulation. this was allso slightly smaller than the foot for the same reasons described above.
In addition to being an aesthetic design feature, the sandwiched foam may allso act to decouple any vibrations from the boxes. This is of course theoretical as I have no means to simulate or measure this.

For finish, I went with Teak veneer.
I thought long and hard about how I would finish the veneer.
Laquer was out, I feel it often comes out as "something on top of the wood. Allso geting a gloss laquer finish to look good on such large surfaces is extremely difficult. A matt finish would of course elliminate the problem of imperfections being revealed by reflective highlights, but that is just to "dull".

I decided i wanted a polished wood apearance, something that would give a nice natural near-gloss shine and bring out the lustre of the wood.

I went for oil sanding followed by a wax-polish.

After ironing the veneer on and trimming it, I manually sanded the veneer down to a smooth 100 grit finish.

I then started oil- sanding with two rounds of 240, two rounds of 340, and then finally one round of 400.
This left me with a silj\ky smooth finish with the pores and grain of the wood very nicely filled in.

I used something called Owatrol "edel olje", or "Noble Oil" as it would translated directly, which is intended for hardwood/ exotic wood. EDEL OLJE - Høyglans ocerflate til alle typer av treverk

Probably quite simmilar to various teak oils etc...

The oil-sanding is not as messy as you would probably expect, just put some covering paper on the floor and off you go.

Thebonus with oil sanding, is that you can do it indoors in your living room without creating a sanding dust-disaster. This is a good thing if you, like me, don't have a proper workshop and live under a climate which does not allways lend it self well to extended outdoor activities..

For polishing I used "black bison wax" from Liberon
Wax finishes : Black Bison Paste Wax - liberon.fr

Initially, I considered bees wax, but the liberon wax contained Carnauba wax, something I anticipated would take me closer to the natural shine and luster I wanted. A good choice it turned out.

The front of the boxes was finished with the same foam material used for the sandwich foot, something that allowed the woofers to be "countersunk and gave a very nice and professional finish.

The sound is awesome. if there is low frequency information in a recording, these subwoofers will reproduce it. Completely confident and without straining, even at considerable SPL. Having said that, I haven't dared to crank things up yet, but impressions so far tells me I have reached the end of the road as far as low frequency reproduction goes.

If I may say so my self, the build and finishing came out very nice, and I dare say I've ended up with something resembling heavy expensive audio equipment rather than some half baked DIY projects.

Now for the pictures...
Attached Images
File Type: jpg DSCF0896.jpg (355.3 KB, 544 views)
File Type: jpg DSCF0899.jpg (336.3 KB, 495 views)
File Type: jpg DSCN0747.jpg (717.5 KB, 477 views)
File Type: jpg DSCN0015.jpg (610.6 KB, 457 views)
File Type: jpg DSCF1104.JPG (948.9 KB, 441 views)
File Type: jpg DSCF1108.JPG (966.4 KB, 199 views)
File Type: jpg DSCF1110.JPG (947.3 KB, 200 views)
File Type: jpg DSCF1122.JPG (950.2 KB, 181 views)
File Type: jpg DSCF1115.jpg (287.0 KB, 211 views)
  Reply With Quote
Old 21st October 2011, 08:04 PM   #2
diyAudio Member
 
firechief's Avatar
 
Join Date: Sep 2008
Location: Near Seattle Wa
Way cool. Agressive and nicely done.
__________________
"You can keep your insurance baby nothing is guaranteed" -Tom Petty
  Reply With Quote
Old 21st October 2011, 08:08 PM   #3
Elbert is offline Elbert  Norway
diyAudio Member
 
Join Date: Mar 2008
Thanks firechief!

Not the best pictures though, just some random snapshots I took during the build..

Here's aother one, not so lucky with that flash-shot, but it presents a bit more detail.

Forgot to mention; Used those "punch in nuts" and umbraco bolts you get as a kit from Parts express. Took great care to get the bolt-circle done precicely. This was indispensable in order to facilitate a smooth assembly and good finish!
Attached Images
File Type: jpg DSCF1112.jpg (414.8 KB, 248 views)
  Reply With Quote
Old 21st October 2011, 11:48 PM   #4
diyAudio Member
 
revboden's Avatar
 
Join Date: Feb 2011
nice, I love that feeling of effortless sound, when it just blends into the background when it should, then mule kicks you when it "drops"*.

(*pardon the hippyhop speak, but I think that term is pretty good )

Last edited by revboden; 21st October 2011 at 11:53 PM.
  Reply With Quote
Old 22nd October 2011, 07:25 AM   #5
diyAudio Member
 
Join Date: Jan 2011
Finishing job on them looks great! Good job!!
  Reply With Quote
Old 29th October 2011, 02:31 PM   #6
FE3T is offline FE3T  Norway
diyAudio Member
 
Join Date: Dec 2004
Location: Close too Lillehammer
Looks very good.
But what can you tell me about the foam you used on the front baffle?

Last edited by FE3T; 29th October 2011 at 02:34 PM.
  Reply With Quote
Old 29th October 2011, 07:11 PM   #7
diyAudio Member
 
chris661's Avatar
 
Join Date: Feb 2008
Location: Sheffield
Blog Entries: 8
Quote:
Originally Posted by Elbert View Post
I dare say I've ended up with something resembling heavy expensive audio equipment rather than some half baked DIY projects.

Now for the pictures...
Yep, the half-baked bit would be me
I'll get something done one day, promise.

Anyway. Those subwoofers look great. I really like the look you've got there. What're you driving them with?

Chris
  Reply With Quote
Old 29th October 2011, 07:36 PM   #8
diyAudio Member
 
Parasonic's Avatar
 
Join Date: Dec 2009
Location: Suncoast
Default Inspiring, definitely

thanks Elbert, they look great

Terry
  Reply With Quote
Old 30th October 2011, 03:33 PM   #9
tb46 is offline tb46  United States
diyAudio Member
 
Join Date: Jan 2006
Location: Texas
Hi Elbert,

Thanks for sharing, and very well done.

Could you elaborate a little on the type and amount of stuffing used?

Regards,
__________________
Oliver
  Reply With Quote
Old 30th October 2011, 03:38 PM   #10
adason is offline adason  United States
diyAudio Member
 
adason's Avatar
 
Join Date: Nov 2004
Location: Maryland
I like your horizontal approach to subwoofers Elbert, I think it looks classic.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Completed LM1875 Stereo build bobsagat666 Chip Amps 12 15th July 2011 07:08 PM
Japanese Inspiration Leonidas Full Range 11 25th February 2007 03:45 PM
some inspiration! mrthieme Multi-Way 3 27th December 2005 07:20 PM
First build completed tonga Solid State 2 18th February 2005 10:26 PM


New To Site? Need Help?

All times are GMT. The time now is 03:32 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2