The V.B.S.S. DIY subwoofer design thread - Page 63 - AVS Forum | Home Theater Discussions And Reviews
Forum Jump: 
 953Likes
Reply
 
Thread Tools
post #1861 of 1883 Old 02-13-2020, 07:35 PM
Member
 
Join Date: Mar 2018
Posts: 31
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 22 Post(s)
Liked: 9
i can have all the lights on the inuke go off without damaging anything right? just making sure.
stylesxd is offline  
Sponsored Links
Advertisement
 
post #1862 of 1883 Old 02-13-2020, 08:46 PM - Thread Starter
AVS Forum Special Member
 
mtg90's Avatar
 
Join Date: Aug 2011
Location: Millbrook, IL
Posts: 2,044
Mentioned: 619 Post(s)
Tagged: 0 Thread(s)
Quoted: 844 Post(s)
Liked: 1682
Yes, the first three level indicators (from bottom) are -24dB, -12dB and -6dB, the red light at the top is the limiter (max output). You don't want that to stay solid for too long (more then a few seconds) but blinking during heavy bass notes won't hurt anything.
stylesxd likes this.
mtg90 is online now  
post #1863 of 1883 Old 02-13-2020, 09:11 PM
Member
 
Join Date: Mar 2018
Posts: 31
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 22 Post(s)
Liked: 9
thanks for all your help.
stylesxd is offline  
Sponsored Links
Advertisement
 
post #1864 of 1883 Old 02-14-2020, 11:35 AM
Newbie
 
Join Date: Jan 2020
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 0
My friend built a VBSS but his looks smaller than mine and he used a bigger bracing. is there to make sure that his subs is working in spec? Should I measure it in open field?
bogaboga is offline  
post #1865 of 1883 Old 02-14-2020, 02:07 PM - Thread Starter
AVS Forum Special Member
 
mtg90's Avatar
 
Join Date: Aug 2011
Location: Millbrook, IL
Posts: 2,044
Mentioned: 619 Post(s)
Tagged: 0 Thread(s)
Quoted: 844 Post(s)
Liked: 1682
As long as the internal volume is similar (+-10%) and the port tuning is correct it should work ok. If the internal volume is off by a large amount or the tuning of by more then a couple Hz the DSP settings won't provide the frequency response it was designed for.

Usually a smaller box is safe as long as the port tuning is roughly correct, you just loose some output around port tuning. You can test the tuning by using a sine wave generator and watching/feeling for the excursion minimum which will occur at the tuning frequency.
mtg90 is online now  
post #1866 of 1883 Old 02-14-2020, 06:07 PM
Newbie
 
Join Date: Jan 2020
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 0
Quote:
Originally Posted by mtg90 View Post
As long as the internal volume is similar (+-10%) and the port tuning is correct it should work ok. If the internal volume is off by a large amount or the tuning of by more then a couple Hz the DSP settings won't provide the frequency response it was designed for.

Usually a smaller box is safe as long as the port tuning is roughly correct, you just loose some output around port tuning. You can test the tuning by using a sine wave generator and watching/feeling for the excursion minimum which will occur at the tuning frequency.
i think its more than -10%. i will try to take an outdoor measurement, how far does need to be from large structures?
bogaboga is offline  
post #1867 of 1883 Old 02-14-2020, 09:19 PM - Thread Starter
AVS Forum Special Member
 
mtg90's Avatar
 
Join Date: Aug 2011
Location: Millbrook, IL
Posts: 2,044
Mentioned: 619 Post(s)
Tagged: 0 Thread(s)
Quoted: 844 Post(s)
Liked: 1682
The further the better but at least ~30 feet / 10 meter should be good enough if you measure from 1m.
mtg90 is online now  
post #1868 of 1883 Old 02-20-2020, 11:41 AM
Newbie
 
Join Date: Jan 2020
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 0
Quote:
Originally Posted by mtg90 View Post
The further the better but at least ~30 feet / 10 meter should be good enough if you measure from 1m.
Just measured his box and it came within -3or-4cm but he used 4x2s as bracing here is a picture. Also the back panel come out little Short so he added some wood to it as you can see in the second picture. Hopefully that’s all okay.
Attached Thumbnails
Click image for larger version

Name:	3A5476A5-D650-4B45-8A82-AC997587D759_1582223328371.jpg
Views:	49
Size:	52.2 KB
ID:	2687648   Click image for larger version

Name:	0FB0B6B4-64B5-4C79-9A49-9CC3ABFA8C2B_1582223946155.jpeg
Views:	51
Size:	16.5 KB
ID:	2687656  
bogaboga is offline  
post #1869 of 1883 Old 02-20-2020, 11:45 AM - Thread Starter
AVS Forum Special Member
 
mtg90's Avatar
 
Join Date: Aug 2011
Location: Millbrook, IL
Posts: 2,044
Mentioned: 619 Post(s)
Tagged: 0 Thread(s)
Quoted: 844 Post(s)
Liked: 1682
That should not be a problem.
mtg90 is online now  
post #1870 of 1883 Old 02-20-2020, 03:31 PM
Newbie
 
Join Date: Jan 2020
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 0
Quote:
Originally Posted by mtg90 View Post
That should not be a problem.
even that bracing? he still haven't glued it, so should i tell him to reduce the size of it?
bogaboga is offline  
post #1871 of 1883 Old 02-21-2020, 08:58 AM
AVS Forum Special Member
 
qguy's Avatar
 
Join Date: Dec 2008
Posts: 1,344
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 259 Post(s)
Liked: 136
I just got my driver earlier, Its frikkin huge !!! SVS PB12 NSD in the background. I stared at the beast for 30 minutes pondering the eventual size of the subwoofer

Attached Thumbnails
Click image for larger version

Name:	Dayton PA 460.jpg
Views:	453
Size:	62.5 KB
ID:	2687986  
4fit?, chadsmith013 and jevchance like this.
qguy is offline  
post #1872 of 1883 Old 02-21-2020, 10:56 AM
Advanced Member
 
DavidinGA's Avatar
 
Join Date: Jan 2010
Location: GA
Posts: 990
Mentioned: 17 Post(s)
Tagged: 0 Thread(s)
Quoted: 518 Post(s)
Liked: 194
Quote:
Originally Posted by qguy View Post
I just got my driver earlier, Its frikkin huge !!! SVS PB12 NSD in the background. I stared at the beast for 30 minutes pondering the eventual size of the subwoofer



Right! Now you'll never ever consider those little baby subs again! 18"+ or don't bother!

Sent from my Pixel 2 XL using Tapatalk
tjambro and 4fit? like this.

--------------------------------------------------
Source: HTPC w/madVR, Video: Epson 5040, 150" 16:9, Audio: Onkyo RZ 830 avr, 5.1.4 Atmos setup. 5 speaker Energy C Series: L/R C300's, C C-C100, SR/SL C50's, 4 in-ceiling Micca R-8c. Subwoofers: 1 MiniMarty um18 w/NX3000D. 2 VBSS 18" Subs w/NX3000D.
DavidinGA is offline  
post #1873 of 1883 Old 02-22-2020, 07:19 AM
Member
 
Join Date: Feb 2017
Posts: 96
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 80 Post(s)
Liked: 20
i have a pair of 31Hz tuned vbss's paired with 2 17Hz tuned martys. Can anyone please assist on a recommendation for adding a house curve to the vbss's, I added a lowshelf to the martys and they sound great but not sure how to boost the vbss's.

The only settings I put in my inuke are from the first page recommendations and I turned down the software gain -6dB to get audyssey to set level above the -12dB trim setting when auto correcting.
DavidinGA likes this.

Last edited by Keith Ferguson; 02-22-2020 at 07:25 AM.
Keith Ferguson is online now  
post #1874 of 1883 Old 02-22-2020, 09:50 AM
Advanced Member
 
DavidinGA's Avatar
 
Join Date: Jan 2010
Location: GA
Posts: 990
Mentioned: 17 Post(s)
Tagged: 0 Thread(s)
Quoted: 518 Post(s)
Liked: 194
Quote:
Originally Posted by Keith Ferguson View Post
i have a pair of 31Hz tuned vbss's paired with 2 17Hz tuned martys. Can anyone please assist on a recommendation for adding a house curve to the vbss's, I added a lowshelf to the martys and they sound great but not sure how to boost the vbss's.



The only settings I put in my inuke are from the first page recommendations and I turned down the software gain -6dB to get audyssey to set level above the -12dB trim setting when auto correcting.
I'm in the early stages of sorted thru rew and integrating a mini Marty (17hz) and 2 vbss (20hz) myself.

Have you attempted to level match them?
Get them in phase?

Seems like most people shoot for a 4-6db house curve, is that your plan? From sweeps I've seen it seems you would need to cut a bunch of the vbss output above 40hz to match the curve of the Marty's, not sure how that all works....

Sent from my Pixel 2 XL using Tapatalk

--------------------------------------------------
Source: HTPC w/madVR, Video: Epson 5040, 150" 16:9, Audio: Onkyo RZ 830 avr, 5.1.4 Atmos setup. 5 speaker Energy C Series: L/R C300's, C C-C100, SR/SL C50's, 4 in-ceiling Micca R-8c. Subwoofers: 1 MiniMarty um18 w/NX3000D. 2 VBSS 18" Subs w/NX3000D.
DavidinGA is offline  
post #1875 of 1883 Old 02-22-2020, 02:55 PM
Member
 
Join Date: Feb 2017
Posts: 96
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 80 Post(s)
Liked: 20
Quote:
Originally Posted by DavidinGA View Post
I'm in the early stages of sorted thru rew and integrating a mini Marty (17hz) and 2 vbss (20hz) myself.

Have you attempted to level match them?
Get them in phase?

Seems like most people shoot for a 4-6db house curve, is that your plan? From sweeps I've seen it seems you would need to cut a bunch of the vbss output above 40hz to match the curve of the Marty's, not sure how that all works....

Sent from my Pixel 2 XL using Tapatalk
I have level matched and aligned but I did all of that with the prescribed settings that the vbss and marty starting points are from the first post of each build. I am still very confused as to when we add the eq settings in the inuke....pre or post room correction.
DavidinGA likes this.
Keith Ferguson is online now  
post #1876 of 1883 Old 02-22-2020, 07:41 PM
Member
 
joker927's Avatar
 
Join Date: Mar 2014
Posts: 93
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 67 Post(s)
Liked: 46
Quote:
Originally Posted by Keith Ferguson View Post
I have level matched and aligned but I did all of that with the prescribed settings that the vbss and marty starting points are from the first post of each build. I am still very confused as to when we add the eq settings in the inuke....pre or post room correction.
There are multiple stages of EQ for the subs.
1) setup the EQ parameters in your inuke based on the first post in this thread for your tune. This makes the VBSS a subwoofer and it is required, do it first and always.
2) optionally, after you optimally place the sub in your room, run REW with 200hz sweeps (and audyssy disabled) and see how the sub performs in your room. Based on REW results, use the unused EQ filters on your inuke to get a flatter response from your sub. This takes a few repeated experiments at least in my case it did.
3) run audyssy to integrate the sub with your mains and to let the software try and perform the last bit of room correction.
4) up the gain on the inuke to your desired levels. Mine is 3 clicks. This has been recommended on other very detailed threads and I highly recommend doing it but it is obviously optional.

Sent from my ONEPLUS A6013 using Tapatalk
Keith Ferguson likes this.
joker927 is online now  
post #1877 of 1883 Old Today, 09:14 AM
Member
 
Join Date: Feb 2017
Posts: 96
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 80 Post(s)
Liked: 20
Quote:
Originally Posted by joker927 View Post
There are multiple stages of EQ for the subs.
1) setup the EQ parameters in your inuke based on the first post in this thread for your tune. This makes the VBSS a subwoofer and it is required, do it first and always.
2) optionally, after you optimally place the sub in your room, run REW with 200hz sweeps (and audyssy disabled) and see how the sub performs in your room. Based on REW results, use the unused EQ filters on your inuke to get a flatter response from your sub. This takes a few repeated experiments at least in my case it did.
3) run audyssy to integrate the sub with your mains and to let the software try and perform the last bit of room correction.
4) up the gain on the inuke to your desired levels. Mine is 3 clicks. This has been recommended on other very detailed threads and I highly recommend doing it but it is obviously optional.

Sent from my ONEPLUS A6013 using Tapatalk
So do I add the EQ settings from REW to the martys and the vbss's separately? or combined? before room correction. And at this stage of EQing we are still shooting for a flat responce, because any house curve will be impacted by the room correction correct?
Keith Ferguson is online now  
post #1878 of 1883 Old Today, 09:42 AM
Member
 
joker927's Avatar
 
Join Date: Mar 2014
Posts: 93
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 67 Post(s)
Liked: 46
Quote:
Originally Posted by Keith Ferguson View Post
So do I add the EQ settings from REW to the martys and the vbss's separately? or combined? before room correction. And at this stage of EQing we are still shooting for a flat responce, because any house curve will be impacted by the room correction correct?
Multi sub EQ is a whole other topic and people more knowledgeable than me will have to help you there. I just have two VBSS and I found better response measuring them together on the same channel.

Sent from my ONEPLUS A6013 using Tapatalk
joker927 is online now  
post #1879 of 1883 Old Today, 11:05 AM
Member
 
Join Date: Nov 2014
Posts: 52
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 23 Post(s)
Liked: 9
I just finished gluing the box together for a slot ported version of VBSS. First time working with mdf and it sure is a learning experience. The box doesnt look pretty, but did all I can. Currently waiting for the seal coat (glue and water mix) to dry, I shall be painting it with satin black enamel tonight or tomorrow.



Have a couple of questions for the experienced builders out here.

1. Could anyone put a link to the Walmart pillows they are using to stuff it with? How many? I see some people stuffing the pillows straight with the cover and some using just the stuffing. Which is the right way to do it? How close to the ports do the stuffing need to be? as in, do the filling cover the ports inside the box? Do you glue the stuffing or pillows to the sides of the box?

I know a lot of questions, but I would like to put it together and not take the driver out again.


2. what size drill bit to use to predrill the holes to mount the driver? I will be using drywall screws as suggested.


Wanting to test it out, I dropped the driver in and connected it to the inuke 1000 dsp with 20hz setting loaded. I was able to make it work by running some test tones from the receiver, but output seemed underwhelming. I hope its just the settings on receiver and inuke. Will be building a second one if I can get an acceptable output from it.

living room: 60" 4k TV | XBox one S | Apple TV 4k | Fire tv stick 4k | Sony BDP 6500| Yamaha rx-v7810 | Polk Audio 65RT 7 channels | Dayton Audio sub-120 | small room theater: Benq w1070 | Sony SACD player | Sony BDP 6500 | Yamaha rx-v661 | Adcom 5600->Front LCR: Polk audio RTi8 | Center: Polk audio CSi5 | Side: Polk audio RTi4 | working on inuke nu1000dsp -> 2 VBSS subwoofer | Office: Denon 1930CI SACD player | Yamaha rx-a730 | Polk RTi4
trjn is offline  
post #1880 of 1883 Old Today, 12:37 PM
Advanced Member
 
DavidinGA's Avatar
 
Join Date: Jan 2010
Location: GA
Posts: 990
Mentioned: 17 Post(s)
Tagged: 0 Thread(s)
Quoted: 518 Post(s)
Liked: 194
Quote:
Originally Posted by trjn View Post
I just finished gluing the box together for a slot ported version of VBSS. First time working with mdf and it sure is a learning experience. The box doesnt look pretty, but did all I can. Currently waiting for the seal coat (glue and water mix) to dry, I shall be painting it with satin black enamel tonight or tomorrow.



Have a couple of questions for the experienced builders out here.

1. Could anyone put a link to the Walmart pillows they are using to stuff it with? How many? I see some people stuffing the pillows straight with the cover and some using just the stuffing. Which is the right way to do it? How close to the ports do the stuffing need to be? as in, do the filling cover the ports inside the box? Do you glue the stuffing or pillows to the sides of the box?

I know a lot of questions, but I would like to put it together and not take the driver out again.


2. what size drill bit to use to predrill the holes to mount the driver? I will be using drywall screws as suggested.


Wanting to test it out, I dropped the driver in and connected it to the inuke 1000 dsp with 20hz setting loaded. I was able to make it work by running some test tones from the receiver, but output seemed underwhelming. I hope its just the settings on receiver and inuke. Will be building a second one if I can get an acceptable output from it.
Personally, I'm not a fan of using pillows for stuffing a ported cab. I would grab a 1-2" foam egg crate mattress topper and glue it to the sides of the inside of the cab and call it good.

Your hole size for the driver will be dependent on what size screws you decide to you. I used plain old drywall screws on my last build and just eye-balled the right sized bit for them.

Sent from my Pixel 2 XL using Tapatalk

--------------------------------------------------
Source: HTPC w/madVR, Video: Epson 5040, 150" 16:9, Audio: Onkyo RZ 830 avr, 5.1.4 Atmos setup. 5 speaker Energy C Series: L/R C300's, C C-C100, SR/SL C50's, 4 in-ceiling Micca R-8c. Subwoofers: 1 MiniMarty um18 w/NX3000D. 2 VBSS 18" Subs w/NX3000D.
DavidinGA is offline  
post #1881 of 1883 Old Today, 12:55 PM
Member
 
Schurter's Avatar
 
Join Date: Aug 2011
Posts: 100
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 58 Post(s)
Liked: 12
With the OG size.
31.5H
23.5W
20D

Can I change it to
31.5H
19W
25D


I want to tune it on it side to fit under the screen ( 20")
Schurter is offline  
post #1882 of 1883 Old Today, 01:15 PM
AVS Forum Special Member
 
Augerhandle's Avatar
 
Join Date: Jan 2009
Location: About 25" away from my computer screen
Posts: 5,628
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
Quoted: 1418 Post(s)
Liked: 1382
I used pillows, but it was to kill the resonant frequency of my enclosure, which was 60" end to end. I don't think you'll need them.

"The wise understand by themselves; fools follow the reports of others"-Tibetan Proverb
_____________________ http://www.scientificamerican.com/article/auger-handle/ ________________________
Augerhandle is offline  
post #1883 of 1883 Old Today, 02:40 PM - Thread Starter
AVS Forum Special Member
 
mtg90's Avatar
 
Join Date: Aug 2011
Location: Millbrook, IL
Posts: 2,044
Mentioned: 619 Post(s)
Tagged: 0 Thread(s)
Quoted: 844 Post(s)
Liked: 1682
Quote:
Originally Posted by Schurter View Post
With the OG size.
31.5H
23.5W
20D

Can I change it to
31.5H
19W
25D


I want to tune it on it side to fit under the screen ( 20")
I'd make it taller (~38") and keep depth the same. The proximity of the rear wall to the internal port exit acts as an extension of the port length giving the desired tuning frequency.

That said if you are building them to be used in the 31Hz configuration the depth does not matter.
mtg90 is online now  
Sponsored Links
Advertisement
 
Reply DIY Speakers and Subs

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