VBSS Build - Wide & Shallow - AVS Forum | Home Theater Discussions And Reviews
Forum Jump: 
 8Likes
  • 2 Post By rdh24
  • 1 Post By rdh24
  • 1 Post By LTD02
  • 3 Post By Jungle Cruiser
  • 1 Post By rdh24
 
Thread Tools
post #1 of 10 Old 07-19-2018, 02:37 PM - Thread Starter
Newbie
 
Join Date: Jun 2017
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Liked: 4
VBSS Build - Wide & Shallow

Hi All,

I'll be building a slot port variation of the VBSS to fit behind my couch for some punchy nearfield bass. A pair of them will run the full length of the couch, each cabinet coming in at 55" wide / 27" tall / 12" deep. A single run of 3/4" walnut will top the twins for use as a shelf behind the couch.

These will be for a living room, 50/50 music and movies, not obsessing too much on critical listening or HT dynamics. I will be building a pair of DIYSG MTM Apollos for front channels (thanks Eric, those drivers are beefy), and a 15" Ultimax to cover the low bass region (builds for both coming soon - a relative term with a 3 month old). Because the room is fairly large and opening to other rooms, I wanted to bring in some nearfield bass. A little research and a sale a parts express dropped me on the doorstep of the VBSS.

The twins will be run in parallel (4 ohms) off one channel of a NU6000DSP, and the Ultimax with the DVC wired in series (4 ohms) off the other channel. Because the cabs are so wide, 5'x5' baltic birch made the best cut sheets - 2 sheets per cab @ $35/sheet and I'm at $140 total for structural lumber. Add in the walnut cap and the build starts to stray a little from the value part of VBSS, but still an amazing value for the aesthetics and performance.

Each cabinet has a net internal volume around 7.7 cu. ft. and are tuned to 27.5hz. I went with slot ports because I could shape them to fit the 12" depth easily and also because I can push them all the way down to the lower edge of the cab so they will fire into the space under our raised couch.

Here's some modeled screen grabs to give you guys an idea of what's to come. I also got in contact with @LTD02 to have him give the design a once over, so there may be some edits.

Hope you're all well.
Attached Thumbnails
Click image for larger version

Name:	Room 1.jpg
Views:	109
Size:	98.0 KB
ID:	2430328   Click image for larger version

Name:	Room 2.JPG
Views:	94
Size:	39.5 KB
ID:	2430330   Click image for larger version

Name:	VBSS x04 Front.JPG
Views:	120
Size:	49.5 KB
ID:	2430332   Click image for larger version

Name:	VBSS x04 Back.JPG
Views:	100
Size:	48.7 KB
ID:	2430334   Click image for larger version

Name:	VBSS x04 Port Detail.jpg
Views:	99
Size:	67.3 KB
ID:	2430336  

Click image for larger version

Name:	WinISD 1.jpg
Views:	88
Size:	177.3 KB
ID:	2430338   Click image for larger version

Name:	WinISD 2.jpg
Views:	76
Size:	153.0 KB
ID:	2430340  
tiger8mush and biga6761 like this.
rdh24 is offline  
Sponsored Links
Advertisement
 
post #2 of 10 Old 07-19-2018, 06:36 PM
AVS Forum Special Member
 
smcmillan2's Avatar
 
Join Date: Jan 2012
Location: Farmington, MI, USA
Posts: 1,907
Mentioned: 25 Post(s)
Tagged: 0 Thread(s)
Quoted: 817 Post(s)
Liked: 712
A nice creative way to deal with a non-dedicated HT space. I look forward to the build and pictures.
smcmillan2 is offline  
post #3 of 10 Old 07-19-2018, 09:57 PM
Member
 
Join Date: Nov 2017
Posts: 26
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 14 Post(s)
Liked: 3
Thinking about doing this down the road with my HT too. Starting with a conventional pair of vbss then maybe one day upgrade to 2 um18s and convert vbss to nearfield. Can’t wait to see the results!
kevinthenewb is offline  
Sponsored Links
Advertisement
 
post #4 of 10 Old 07-20-2018, 06:24 AM
Member
 
tiger8mush's Avatar
 
Join Date: Jun 2009
Posts: 64
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 21 Post(s)
Liked: 16
Quote:
Originally Posted by rdh24 View Post
5'x5' baltic birch made the best cut sheets - 2 sheets per cab @ $35/sheet and I'm at $140 total for structural lumber.
Nice buy! I paid $66/sheet yesterday (everything is more expensive in Connecticut), no wonder I'm walking funny today
tiger8mush is offline  
post #5 of 10 Old 07-20-2018, 09:07 AM
Advanced Member
 
HFGuy's Avatar
 
Join Date: Jan 2011
Location: Toronto
Posts: 972
Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 229 Post(s)
Liked: 244
Is the port going to be firing into the "wall" or underneath the sectional ?
HFGuy is offline  
post #6 of 10 Old 07-20-2018, 11:03 AM - Thread Starter
Newbie
 
Join Date: Jun 2017
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Liked: 4
Thanks, @smcmillan2 and @kevinthenewb ! I'm hoping to do the DIY section proud with my first forum build.

@tiger8mush - Yeah, I think it may have been a little too good a deal. The more I look at the 5x5 material compared to some 4x8 scraps I have, I think it may actually be russian birch (exposed patches in the face ply, 18mm - not quite 3/4", minor edge voids...). No matter though, I'm going to give the cabinet the auto body treatment so the walnut pops in contrast.

If anyone is wondering why I went with higher end plywood instead of MDF, my reasons are mostly to do with moisture damage. We're close enough to the ocean that the salty humidity is a concern, that and I don't foresee the ankle biters being too cautious with liquids. Weight and strength are also factors.

@HFGuy - The ports will be firing underneath the sectional (see attached image), I figured that would help a little with compression issues since the woofers are pushed up to the back of the sofa. This is just an assumption though and I could be off base with how it will actually behave.

And a sneak peek at the DIYSG MTM Apollo build that's in progress as well...
Attached Thumbnails
Click image for larger version

Name:	Port Detail 2.JPG
Views:	74
Size:	46.8 KB
ID:	2430658   Click image for larger version

Name:	Apollo x03.jpg
Views:	82
Size:	249.7 KB
ID:	2430660   Click image for larger version

Name:	Apollo x05.jpg
Views:	70
Size:	134.0 KB
ID:	2430662  
tiger8mush likes this.
rdh24 is offline  
post #7 of 10 Old 07-20-2018, 09:29 PM
AVS Forum Addicted Member
 
LTD02's Avatar
 
Join Date: Oct 2003
Posts: 21,165
Mentioned: 835 Post(s)
Tagged: 1 Thread(s)
Quoted: 2919 Post(s)
Liked: 3624
what are the dimensions of the port and how much spacing is there between the end of the port and the inside of the back wall of the cab?
biga6761 likes this.

Listen. It's All Good.
LTD02 is offline  
post #8 of 10 Old 07-20-2018, 11:05 PM
Member
 
Jungle Cruiser's Avatar
 
Join Date: Jun 2013
Posts: 53
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 24 Post(s)
Liked: 36
The title of the thread reminds me of my (thankfully) ex-wife.
Raylon, rdh24 and bebb like this.
Jungle Cruiser is offline  
post #9 of 10 Old 07-26-2018, 08:16 PM - Thread Starter
Newbie
 
Join Date: Jun 2017
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Liked: 4
Quote:
Originally Posted by LTD02 View Post
what are the dimensions of the port and how much spacing is there between the end of the port and the inside of the back wall of the cab?
Thanks for checking out the project @LTD02 !

The port is 9" wide, 3" tall and 8" long. The distance from the face of the internal port to the back wall is 3.25" (the cross section of the port goes from 27 in² to 48.75 in² where the port opens to the inside of the cabinet). I'll likely be adding a small flange w/ round over at the internal port opening to prevent turbulent (noisy) flow around the sharp corners.
Attached Thumbnails
Click image for larger version

Name:	Port Detail 3.JPG
Views:	38
Size:	44.7 KB
ID:	2433492  
LTD02 likes this.
rdh24 is offline  
post #10 of 10 Old 07-27-2018, 09:57 PM
Advanced Member
 
bebb's Avatar
 
Join Date: Sep 2017
Location: Middle Illinois
Posts: 578
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 221 Post(s)
Liked: 156
Quote:
Originally Posted by Jungle Cruiser View Post
The title of the thread reminds me of my (thankfully) ex-wife.
HAHA! Same!

If bad sound were Faital, good sound would be almost impossible
Killed two Mach5 21s and three UM-18s (and counting?)
bebb is offline  
Sponsored Links
Advertisement
 
Reply DIY Speakers and Subs

Tags
apollo , PA460-8 , vbss

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

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