The V.B.S.S. DIY subwoofer design thread - Page 36 - AVS Forum | Home Theater Discussions And Reviews
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post #1051 of 1501 Old 08-20-2018, 08:30 PM
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Finally got my VBSS done! Used them unfinished for about 6 months and decided weather was nice, it was time to finish them. Turned them into concert subs basically. Tuned to 30hz-ish. Duratexed and grilled. Loved putting this all together. Makes a pretty kickass 2.2 stereo system in my basement. I learned from slots on bottom that spiders loved to make their home in them so now they are slots on top. Hopefully they stay out now!



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post #1052 of 1501 Old 08-21-2018, 09:55 AM
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Quote:
Originally Posted by Raylon View Post
Finally got my VBSS done! Used them unfinished for about 6 months and decided weather was nice, it was time to finish them. Turned them into concert subs basically. Tuned to 30hz-ish. Duratexed and grilled. Loved putting this all together. Makes a pretty kickass 2.2 stereo system in my basement. I learned from slots on bottom that spiders loved to make their home in them so now they are slots on top. Hopefully they stay out now!



How do you like those monoprice PA speakers?
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post #1053 of 1501 Old 08-21-2018, 10:14 AM
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Two questions -

I’m building two of these- I already have a 1000DSP- I understand you run in bridges parallel, And shut off “power” limiter or in other words run at full power capable?

And build says Slot port 22” W 1” H 32” L I assume that’s front, but what about side slot port? I’m chasing the 15hz tune.
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post #1054 of 1501 Old 08-21-2018, 12:34 PM
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Originally Posted by Remy.Alexander View Post
Two questions -

I’m building two of these- I already have a 1000DSP- I understand you run in bridges parallel, And shut off “power” limiter or in other words run at full power capable?

And build says Slot port 22” W 1” H 32” L I assume that’s front, but what about side slot port? I’m chasing the 15hz tune.
Unsure about the side slot port but the 1000DSP should be limited in bridge mode to 71.5 volts if I recall correctly.
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post #1055 of 1501 Old 08-21-2018, 12:35 PM
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How do you like those monoprice PA speakers?
I'm actually liking them a lot so far. I've only had them for a week but so far they are promising. I had an older set of Peaveys and they sound as good if not a hair better. I think in total they cost me about $140 a piece with shipping since they are only $99 right now.
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post #1056 of 1501 Old 08-21-2018, 02:54 PM
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Originally Posted by Zarkoff500 View Post
Unsure about the side slot port but the 1000DSP should be limited in bridge mode to 71.5 volts if I recall correctly.
O wow I thought it be under powered then pushing two of these.
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post #1057 of 1501 Old 08-21-2018, 05:22 PM
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Hi guys,

I was thinking whether it would be possible to build an angled version of the PA460-8 VBSS and put in the back of my HT room below the speakers in that triangular space, what do you think?
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post #1058 of 1501 Old 08-22-2018, 05:17 AM
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Originally Posted by Remy.Alexander View Post
O wow I thought it be under powered then pushing two of these.
In bridged mode I believe they get about 320 watts each (based on dyno tests) which is enough to drive them to excursion max. I've read that the 3000DSP gets a little more out of them but I am not sure in what way. I do know that in my ~1500 cft garage they are capable of considerably more volume then I can stand. Movies like BR 2049 & Fury Road are quite immersive
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post #1059 of 1501 Old 08-22-2018, 05:34 AM
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Originally Posted by starcat View Post
Hi guys,

I was thinking whether it would be possible to build an angled version of the PA460-8 VBSS and put in the back of my HT room below the speakers in that triangular space, what do you think?
As long as the internal volume is the same, no reason you can't!
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post #1060 of 1501 Old 08-22-2018, 05:49 AM
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Angled Version of VBSS

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As long as the internal volume is the same, no reason you can't!
I should probably use the original plastic ports, as I can image a slot version would be difficult to calculate in this case?

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post #1061 of 1501 Old 08-22-2018, 05:55 AM
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Originally Posted by Remy.Alexander View Post
And build says Slot port 22” W 1” H 32” L I assume that’s front, but what about side slot port? I’m chasing the 15hz tune.
The 32" would be total port length, i.e. sum of horizontal and vertical parts of the slot. This number matches also the length of both port braces (see here Slot Version of VBSS) - as they sit in the port, they give exactly the port length.

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post #1062 of 1501 Old 08-22-2018, 06:31 AM
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Originally Posted by starcat View Post
The 32" would be total port length, i.e. sum of horizontal and vertical parts of the slot. This number matches also the length of both port braces (see here Slot Version of VBSS) - as they sit in the port, they give exactly the port length.
Thanks fo the link- I was asking because side slot port wouldn’t be wide enough so I was wondering side slot port dimensions- can I just not add devider as apposed to “stuffing” it?
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post #1063 of 1501 Old 08-23-2018, 04:50 PM
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Is it possible to use another non DSP amplifier other than the inuke? and use a minidsp for EQ? or would it not be able to limit the maximum output to safely drive the sub?
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post #1064 of 1501 Old 08-24-2018, 10:41 AM - Thread Starter
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You can use an non DSP amp and a miniDSP for EQ using the settings I posted in the text file but you do loose the limiting function unless you take the time to test and set the compressor correctly on the miniDSP for whichever amplifier and gain settings you use.
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post #1065 of 1501 Old 08-25-2018, 05:03 PM
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Originally Posted by mtg90 View Post
You can use an non DSP amp and a miniDSP for EQ using the settings I posted in the text file but you do loose the limiting function unless you take the time to test and set the compressor correctly on the miniDSP for whichever amplifier and gain settings you use.
Thank you. I also just saw that PE has the B-52 SP-1804 at $75. How would it compare with the 460?
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post #1066 of 1501 Old 08-27-2018, 07:48 AM
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I have all the parts ordered for this. Going to use a inuke nu1000dsp since the price was right. I was thinking of making a slot port version but as a rubiks cube sub. As long as I keep the port dimensions and volume the same as post #789 does anyone see anything wrong with a cube shape? Also since I will be doubling up the mdf will there be any issue with using 1/2 mdf for both the box and cube tiles? I would think this would add sufficient strength but want to make sure before going this route. Any input is appreciated.

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post #1067 of 1501 Old 08-27-2018, 05:10 PM
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Should be fine. You will need to be careful if the inside end of the port comes close to the back wall. That could change the tuning.

Doubled up 1/2" is fine, just extra work. I'd rather use 1" and then use a router to cut the groves. Or use 3/4" and then 1/4" for the squares.
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post #1068 of 1501 Old 08-28-2018, 09:29 AM
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Ugh I want 15hz ONLY tune- But budget is limited because I’m building 5 speakers also- can I just do one 4” presision port? Or one “square” port? I have no need for the other tunes- as these will be 90% theater usage.
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post #1069 of 1501 Old 08-28-2018, 10:37 AM
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Quote:
Originally Posted by Remy.Alexander View Post
Ugh I want 15hz ONLY tune- But budget is limited because I’m building 5 speakers also- can I just do one 4” presision port? Or one “square” port? I have no need for the other tunes- as these will be 90% theater usage.
You can easily do a 15hz tune using only a slot port. Will have to use WinISD to figure out the dimensions though to get it right.
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post #1070 of 1501 Old 08-28-2018, 11:24 AM
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Quote:
Originally Posted by Remy.Alexander View Post
Ugh I want 15hz ONLY tune- But budget is limited because I’m building 5 speakers also- can I just do one 4” presision port? Or one “square” port? I have no need for the other tunes- as these will be 90% theater usage.

The modified VBSS build in my signature is a single 4" Precision port. No need for more if you only want the 15Hz tune...

Sub builds: Yet another Infinity 1260 build | Twins! | Modified V.B.S.S. build | UM12-22 builds | AV stand and sealed UM18s

Speaker builds: DIYSG HTM-10 build | DIYSG Volt-6 build | DIYSG Fusion-8 builds
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post #1071 of 1501 Old 08-28-2018, 12:39 PM
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Originally Posted by Raylon View Post
You can easily do a 15hz tune using only a slot port. Will have to use WinISD to figure out the dimensions though to get it right.
Was trying to save on materials- Theater project starting to get pricy.
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post #1072 of 1501 Old 08-28-2018, 02:35 PM
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Was trying to save on materials- Theater project starting to get pricy.
That's why I did slot ports. All those precision ports start to add up quick.
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post #1073 of 1501 Old 08-28-2018, 04:38 PM
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That's why I did slot ports. All those precision ports start to add up quick.
That is true- if I do slot port I’ll build without center brace - it’ll drive me insane having to have it “stuffed” all the time. 15hz or go home haha
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post #1074 of 1501 Old 08-28-2018, 04:58 PM
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Why don't you just use plumbing pvc? That's literally all we used here in Aus for ports until the slot port took off.... Flaring is as simple as using a heatgun and flaring over the back of a breakfast bowl or if smaller I used tally bottles (longneck beer bottles) back pre 2000!
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post #1075 of 1501 Old 08-28-2018, 07:24 PM
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Originally Posted by Remy.Alexander View Post
That is true- if I do slot port I’ll build without center brace - it’ll drive me insane having to have it “stuffed” all the time. 15hz or go home haha
I would have it use a center brace you just modify the dimensions to make it 15hz utilizing both 'chambers' of the slot port. That's how I did mine I tuned to 30hz. You don't need to mess with any stuffing.
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post #1076 of 1501 Old 08-29-2018, 11:48 AM
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Originally Posted by starcat View Post
I was thinking whether it would be possible to build an angled version of the PA460-8 VBSS and put in the back of my HT room below the speakers in that triangular space, what do you think?
Guys, this is the space that I have for an angled version of the VBSS. Could take some help here.

As for the ports, I think it would be easier to use the plastic tube ports, right?
The 1264 x 985 mm wall would be the front baffle with driver and both ports.

No problem building two of them in my shop, woodworking skills and fine machinery are available.

Thanks for any hints and ideas!
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post #1077 of 1501 Old 08-29-2018, 12:11 PM
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This should be the final form, what do you think?
Got 6,254113212 cu foot internal volume, I think the VBSS needs to be 6.25. There is a little bit left for internal bracing.

Is there any favorable place for both port tubes?
If not really, I would place them centered below the driver, like in the original design...
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post #1078 of 1501 Old 08-29-2018, 01:55 PM - Thread Starter
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On the first post!

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Originally Posted by mtg90 View Post
If a slot port is desired you can build it with a full width slot port that is 1.5" high x 28" long with a brace running down the middle of the port, This will allow for both the 20hz tune with both halves of the port open or the 15hz tune if one of the halves was closed off.

If just the 15Hz tune is desired then the slot port can be 1" high, full width (22") and 32" long.
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post #1079 of 1501 Old 08-30-2018, 11:05 AM
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Guys,

if I have in my dedicated HT room
- 6 subwoofers, 4 in the front and 2 in the back, and
- two subwoofer outputs from my preamp

should I connect the subwoofers to one 3000DSP so that I have
- one channel running the front 4 and the other channel running the back 2, or
- one channel running the left side (2 front and 1 back) and the other channel the other/right side?

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post #1080 of 1501 Old 08-30-2018, 11:18 AM - Thread Starter
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Front subs on one channel, back subs on another.

That said you should be able to manually adjust the subs up using the delay settings in the inuke and just run a single subwoofer output to the inuke. If you take the time to setup delays properly you will usually end up with better results then the preamp will give you with it's automatic setup using both subwoofer outputs.
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