VBSS Build - AVS Forum | Home Theater Discussions And Reviews
Forum Jump: 
 2Likes
  • 2 Post By H4wG
Thread Tools
post #1 of 7 Old 04-19-2017, 03:53 PM - Thread Starter
Newbie
 
Join Date: Apr 2017
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 2
VBSS Build

Hello!

I decided to build a VBSS to add to my setup which consisted of a R-S202 receiver and a pair of Boston a70's in a 10x15x8' high room (that's a guess I didn't actually measure).

In order to connect my receiver to an iNUKE the parts express tech I was talking to recommended a talent SXC unbalanced/balanced converter. I went ahead and ordered the components for the VBSS, an iNUKE 1000DSP, a talent SXC converter, and assorted connectors and cables and stuff.

I picked up a 4' x 8' sheet of 3/4" MDF and a 2' x 4' sheet of 1/2" MDF and cut them to size with a table saw:

The 2' x 4' piece was shaped like a rhombus and I messed up one of the cuts, so the corners were a little off when I glued it on.
I got some corner and bar clamps and some titebond ii and glued the box together:

Next I glued in the internal support pieces (cut to length as I went on a chop saw):

Glued on the two front pieces one at a time (all holes cut with a jigsaw):

Drilled a hole for the speakon connector in the back, did some quick sanding and a flat black rattle can paint job:

Next I drilled all the screw holes. I used #10 x 1" round head wood screws for mounting the driver, #6 x 1" round head screws for mounting the precision ports (I went with 20Hz tuning), and #5 x 1" flat head screws for mounting the speakon connector. Then I put some poly-fil in and assembled everything. I forgot to take a picture after assembling, I will take one when I get home.

I determined that the speaker actually needs to be connected to +1 (pos) and +2 (neg) for bridged mode, so I unscrewed the speakon connector and switched the quick disconnects to the proper pins. Hooked everything up and loaded the settings from the VBSS thread onto the iNUKE and it works great! Very loud. I'm going to have to build a second one in a few months though, I really want to know what that would sound like.

One question: In the text file that provided instructions for setting up the iNUKE (from the VBSS thread):
Quote:
If using an iNuke 1000DSP to power the VBSS it should be in bridged mode with the limiter set to 71.5Vp
I have much less experience here but I calculated a slightly higher voltage:
PA460-8 is rated for 500W RMS.
According to Wikipedia I think this actually means 500W continuous average power. Calculating for the peak voltage at 500W continuous average power gives Vp = 89.44 V.
Math:
Quote:
Pavg = Vrms^2 / R ----> Vrms = sqrt(R * Pavg) = sqrt(8 * 500) = 63.24 V
Vp = Vrms * sqrt(2) = 63.24 * sqrt(2) = 89.44 V
If they actually mean 500W RMS then I come up with Vp = 75.21 V
Math:
Quote:
Pp = Prms * sqrt(2) = 500 * sqrt(2) = 707.12
P = V^2 / R ----> V = sqrt(P * R) = sqrt(8 * 707.12) = 75.21 V
Equations from here.
Maybe I'm misunderstanding something or there's some sort of speaker specific nonsense going on but I'd be interested to hear your thoughts.

I plan on ordering a grill frame kit from parts express and when that arrives I want to fix the corners and give it a nicer paint job.

Not sure if I attached the pictures correctly, they seem very large?
Attached Thumbnails
Click image for larger version

Name:	IMG_20170416_144934.jpg
Views:	213
Size:	87.5 KB
ID:	2092073   Click image for larger version

Name:	IMG_20170418_143058.jpg
Views:	205
Size:	194.3 KB
ID:	2092097   Click image for larger version

Name:	IMG_20170418_153105.jpg
Views:	207
Size:	105.4 KB
ID:	2092105   Click image for larger version

Name:	IMG_20170416_171903.jpg
Views:	200
Size:	83.6 KB
ID:	2092265   Click image for larger version

Name:	IMG_20170417_152516.jpg
Views:	202
Size:	100.9 KB
ID:	2092273  

Brazle and fill35U like this.

Last edited by H4wG; 04-19-2017 at 04:08 PM.
H4wG is online now  
Sponsored Links
Advertisement
 
post #2 of 7 Old 04-19-2017, 03:58 PM
AVS Forum Special Member
 
brian6751's Avatar
 
Join Date: Mar 2006
Location: Canton, MI
Posts: 5,573
Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 999 Post(s)
Liked: 900
You don't need a converter. I use this

https://www.amazon.com/gp/aw/d/B003S...?ie=UTF8&psc=1

Sent from my ASUS_Z00AD using Tapatalk

That's not science! - Cyborg

Steam ID: The Barbeerian


Rivers Edge Theater
brian6751 is online now  
post #3 of 7 Old 04-19-2017, 03:59 PM
AVS Forum Special Member
 
brian6751's Avatar
 
Join Date: Mar 2006
Location: Canton, MI
Posts: 5,573
Mentioned: 20 Post(s)
Tagged: 0 Thread(s)
Quoted: 999 Post(s)
Liked: 900
Build is looking really good

Sent from my ASUS_Z00AD using Tapatalk

That's not science! - Cyborg

Steam ID: The Barbeerian


Rivers Edge Theater
brian6751 is online now  
 
post #4 of 7 Old 04-20-2017, 11:38 AM
Senior Member
 
mikeTRON250LM's Avatar
 
Join Date: Jan 2017
Posts: 223
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 107 Post(s)
Liked: 66
mikeTRON250LM is offline  
post #5 of 7 Unread Yesterday, 11:54 AM
Advanced Member
 
OJ Bartley's Avatar
 
Join Date: Apr 2009
Location: Toronto, ON
Posts: 585
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 187 Post(s)
Liked: 258
I think the limit is set at that point because that's the amount of power it would take to drive the speaker past xmax in this particular enclosure, not beyond its thermal power handling limit... but I may be wrong. Either way, great looking build! Impressive jigsaw circles, was that freehand?
OJ Bartley is offline  
post #6 of 7 Unread Today, 10:51 AM
Advanced Member
 
Nexgen76's Avatar
 
Join Date: May 2009
Location: Charlotte, NC
Posts: 722
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 448 Post(s)
Liked: 107
Hey i was curious which speakon connector you went with & if you have pics of it in the back plus wiring them to the sub inside this would help me I'm going to build 4 of these in a few weeks. Subbed.......

JVC DLA-RS400U
Sliver Ticket 120' Absolute Cinema Black screen
Aggressive 1299 L/C/R/, Volt 10XL x 2 surround, MKII Atmos Modules x 4(Jav's build)
Denon AVRX6200W /Acurus A125x5
Philips BDP7501 4K UHD Player
Ported Primate SI 18" HST subs x 2(DIY)
Nexgen76 is offline  
post #7 of 7 Unread Today, 02:24 PM - Thread Starter
Newbie
 
Join Date: Apr 2017
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 2
Quote:
Originally Posted by Nexgen76 View Post
Hey i was curious which speakon connector you went with & if you have pics of it in the back plus wiring them to the sub inside this would help me I'm going to build 4 of these in a few weeks. Subbed.......
Sorry didn't take any pics of the wiring. I used this connector. I just used a 1" spade bit to drill the hole. For bridged mode I had to connect the speaker positive to +1 and the speaker negative to +2, but I think having two subs per channel requires different connections (two connectors per sub)? They're quick disconnects so it's pretty easy to unscrew the connector and swap em around if you need to.

Quote:
Originally Posted by OJ Bartley View Post
I think the limit is set at that point because that's the amount of power it would take to drive the speaker past xmax in this particular enclosure, not beyond its thermal power handling limit... but I may be wrong. Either way, great looking build! Impressive jigsaw circles, was that freehand?
Hmm that would make sense. Thanks! Jigsaw circles were freehand, I just drew a good circle and went slow.
H4wG is online now  
Sponsored Links
Advertisement
 
Reply DIY Speakers and Subs



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