The V.B.S.S. DIY subwoofer design thread - Page 74 - AVS Forum | Home Theater Discussions And Reviews
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post #2191 of 2571 Old 05-15-2020, 05:24 AM
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Quote:
Originally Posted by Remy.Alexander View Post

If you have a read over the thread, this "build" with "TUNE" is designed for the PA460 and maybe a couple of woofers that closely match the PA460. Get your subs specs, pop them in WinISD and model it ported and go from there.. You're missing the point of this build...Ingeniously took a woofer NOT meant for subwoofer duty and made it possible.

I forgot my VBSS tune in my Inuke while testing other woofers and nearly cooked them--not advised...
Sorry, i did not understand your reply.

Will use a PA-460 for this build but using
1. Flared port with 2.5" deeper than design.

OR

2. Slot port with wider and deeper than original design.

Don't have access to WinISD for now, just using my phone. I'm stuck away from home due travel ban.

Thanks
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post #2192 of 2571 Old 05-15-2020, 05:37 AM
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Quote:
Originally Posted by weng2x View Post
Sorry, i did not understand your reply.

Will use a PA-460 for this build but using
1. Flared port with 2.5" deeper than design.

OR

2. Slot port with wider and deeper than original design.

Don't have access to WinISD for now, just using my phone. I'm stuck away from home due travel ban.

Thanks



My bad, I read it to fast as you want to use a different driver
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post #2193 of 2571 Old 05-15-2020, 03:46 PM
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Quote:
Originally Posted by LarryF6108 View Post
.

I am building this version of the VBSS and making a sofa table, I have a Behringer NX 3000D, if I want to power both PA 460’ s on one channel, will I wire it in, Series or Parallel? Thanks
Just wanted to post an update on my dual vbss sofa table build, hopefully will be finished next week.
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post #2194 of 2571 Old 05-15-2020, 03:51 PM
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Originally Posted by LarryF6108 View Post
Just wanted to post an update on my dual vbss sofa table build, hopefully will be finished next week.
Forgot to mention that that it will be topped with this granite counter top.
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post #2195 of 2571 Old 05-15-2020, 09:01 PM
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Quote:
Originally Posted by weng2x View Post
I plan to build a VBSS to complement a DIY JL12W7 sub tuned to 20hz and a PB13 Ultra in a 2300 cuft room.

My first choice is the flared port cab design, however height is limited to 28" as the screen frame bottom edge is 29" high. Based on the original cab dimension of 23.5x20x31.5 = 14,805 in3, I came up with a modified height at 23.5x22.5x28 = 14,805 in3 which is exactly the same volume of the original design.

My questions are:
1. Will I just add 2.5" to the port length to keep the end bell the same distance to the inner back wall? So, 19.5" instead of 17".
2. Is the port tuning now altered?
3. Is it critical to keep the port gap to the side wall as per design?

My other option is to use a slot port to achieve a 25" height to match the height and depth of the other DIY sub. Both subs will be placed below the screen while the PB13 goes to the middle side of the room. This is the cab dimension I came up close to the original volume, 26.5x22.5x25= 14,906 in3.

Can somebody help me calculate the port length for a 17/20hz tuned cab with a new outer width of 26.5" and depth of 22.5". Both subs will be powered by an Inuke3000 with a balanced MiniDSP 2x4.

Thanks and be safe everyone.

Weng
I just realized that it is not possible to put in an 18" driver and a 7.25" dia flared end on a 28" high (26.5" internal) cabinet. So, have to scrap this idea.

So, the build will be a slotted port with "external" height= 25" x depth= 26.5" & width= 22.5".

What will be the port length to achieve a 15/20hz tuning as per original plan?

Hope someone can help as I do not have access to Winisd at the moment while away from home.

Thanks 🙂

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post #2196 of 2571 Old 05-16-2020, 11:41 AM
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Well I went to Lowes today and bought my MDF and picked up a router they had for $89. It was an Hitachi fixed router with a plunge base on clearance (was $179). I guess now I need to order my Jasper Jig and I should be good to go.

7.4.4 Theater Room: JVC-RS500, Silver Ticket AT 2.35:1 142”, Onkyo RZ830, Anthem PVA-7, Panasonic UB420, Apple TV 4K, JBL Studio 530’s, Dual Driver VBSS

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post #2197 of 2571 Old 05-16-2020, 11:20 PM
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so many pages of info and im sure this has been answered already but do i need any sort of gasket or anything when installing my speakon port to the box or should i glue it in? also same question for the 4" ports, do they need some sort of gasket for optimal seal?
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post #2198 of 2571 Old 05-17-2020, 09:41 AM
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Quote:
Originally Posted by Mocs123 View Post
Well I went to Lowes today and bought my MDF and picked up a router they had for $89. It was an Hitachi fixed router with a plunge base on clearance (was $179). I guess now I need to order my Jasper Jig and I should be good to go.
I made a trammel for my router to cut circles. Work beautifully! Just be careful when the center drops out. I left about .010 and bumped it from the back side with my palm so it didn't tear material from the baffle then cleaned it up around the edges with a razor knife. Turned our very clean.
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post #2199 of 2571 Old 05-17-2020, 04:33 PM
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Originally Posted by Mocs123 View Post
Well I went to Lowes today and bought my MDF and picked up a router they had for $89. It was an Hitachi fixed router with a plunge base on clearance (was $179). I guess now I need to order my Jasper Jig and I should be good to go.

Just ordered my 4 PA460- build happening this week.
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post #2200 of 2571 Old 05-17-2020, 06:44 PM
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Quote:
Originally Posted by LarryF6108 View Post
Quote:
Originally Posted by LarryF6108 View Post
Just wanted to post an update on my dual vbss sofa table build, hopefully will be finished next week.
Forgot to mention that that it will be topped with this granite counter top.
Awesome getting started on my own this week
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post #2201 of 2571 Old 05-18-2020, 06:53 AM
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where is the best place to order the Behringer NX3000D? I see Sweetwater has a 2 year warranty, which seems to be twice as long as from other places.

REC: Onkyo TX-NR609 (Denon AVR X3600H on order)
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post #2202 of 2571 Old 05-19-2020, 06:53 AM
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where is the best place to order the Behringer NX3000D? I see Sweetwater has a 2 year warranty, which seems to be twice as long as from other places.
The warranty should be through Behringer, not the distributor. I bought mine from PartsExpress for $320 on black Friday

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post #2203 of 2571 Old 05-19-2020, 07:07 AM
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The warranty should be through Behringer, not the distributor. I bought mine from PartsExpress for $320 on black Friday
It looks like Behringer offers a 1yr warranty - but if you register it online within 90 day they extend it to a 3yr warranty. As with all warranties there are exclusions...

Sweetwater offers their own 2yr warranty on most of their items, the NX3000D included.

So I suppose the 2yr from Sweetwater isn't really much of a benefit in this case.

Starting by build of two VBSS's. Need to get an amp on order. Been watching but I haven't seen any sales in a while...

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post #2204 of 2571 Old 05-19-2020, 08:39 AM
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Quote:
Originally Posted by LarryF6108 View Post
.

I am building this version of the VBSS and making a sofa table, I have a Behringer NX 3000D, if I want to power both PA 460’ s on one channel, will I wire it in, Series or Parallel? Thanks
I wouldn't recommend this route. Instead, wire one sub to each channel at 8 ohms. If you're concerned about only running one cable to the box, you can use a 4 element speaker cable with a 2 channel neutrik. Unless the plan is to soon after add a second pair, I'd use both channels to distribute the load.

Quote:
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Since PA460s are 8ohm, you can wire the pair in parallel and that'll present a 4ohm load to one channel on the amp, which is ideal.
Running the subs as a stereo pair of 8 ohm loads the NX3000D outputs 2X440w (source Parts Express). Running the two on a single bridged channel outputs 900w/2 (450w per speaker). Given the nearly identical power output, it makes more sense to distribute the load between the two channels instead of running one channel hot and one channel dead.

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post #2205 of 2571 Old 05-19-2020, 03:22 PM
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Originally Posted by jevchance View Post
I wouldn't recommend this route. Instead, wire one sub to each channel at 8 ohms. If you're concerned about only running one cable to the box, you can use a 4 element speaker cable with a 2 channel neutrik. Unless the plan is to soon after add a second pair, I'd use both channels to distribute the load.



Running the subs as a stereo pair of 8 ohm loads the NX3000D outputs 2X440w (source Parts Express). Running the two on a single bridged channel outputs 900w/2 (450w per speaker). Given the nearly identical power output, it makes more sense to distribute the load between the two channels instead of running one channel hot and one channel dead.
@jevchance , thanks I can do that, no problem at all. Cabinet work all done, drill holes for neutrik connector tomorrow, move it inside and install drivers and test it out.
Thanks everyone for help.
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post #2206 of 2571 Old 05-19-2020, 03:27 PM
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@jevchance , thanks I can do that, no problem at all. Cabinet work all done, drill holes for neutrik connector tomorrow, move it inside and install drivers and test it out.
Thanks everyone for help.
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post #2207 of 2571 Old 05-19-2020, 04:32 PM
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Amazing.. you're ports are down firing? What was the final internal volume you achieved? My design is sandwiched between walls and the sofa so I don't need it to look as pretty, but I'm extending one end for open bookshelves. That is amazing, I really hope I can pull as much progress as you did so quickly..
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post #2208 of 2571 Old 05-19-2020, 06:29 PM
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Amazing.. you're ports are down firing? What was the final internal volume you achieved? My design is sandwiched between walls and the sofa so I don't need it to look as pretty, but I'm extending one end for open bookshelves. That is amazing, I really hope I can pull as much progress as you did so quickly..
Thank you, I just took the the design that @mtg90 posted in post 2137 of this thread, and just made it down firing, hoping that it works. From all that I have read here, as long as I have 4 to 5 inches of clearance on the bottom it should be good to go.
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post #2209 of 2571 Old 05-19-2020, 06:43 PM
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Excellent work!

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post #2210 of 2571 Old 05-19-2020, 06:50 PM
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It looks like you're the first to do the dual driver VBSS and such a beautiful job of it as well. I've got everything I think I need to do mine and plan on working on it this weekend. Please report back on your impression.

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post #2211 of 2571 Old 05-20-2020, 04:18 AM
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My Two Dual VBSS will start today. Hitting up Home Center soon for plywood. Building two with 15hx slotport. Using my NX3000D i have a miniDSP 2x4HD so ill be able to fine tune them.. Funny thing is is gave up 4 sealed 390HF to go bavk to VBSS lol Been itching to go back. I had two singles before and was getting 10hz no problem so this should be fun. ALso gotta love the magic tune!! Plug em in, align them, set your house curve and let em ride.
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post #2212 of 2571 Old 05-20-2020, 08:07 AM
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Originally Posted by LarryF6108 View Post
Thank you, I just took the the design that @mtg90 posted in post 2137 of this thread, and just made it down firing, hoping that it works. From all that I have read here, as long as I have 4 to 5 inches of clearance on the bottom it should be good to go.
And it’s done except for hooking it up to the amp and testing it out, which will happen this afternoon, gotta give my back a break, granite is heavy.
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post #2213 of 2571 Old 05-20-2020, 08:15 AM
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Nice work! Looks great.

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post #2214 of 2571 Old 05-20-2020, 09:32 AM
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And it’s done except for hooking it up to the amp and testing it out, which will happen this afternoon, gotta give my back a break, granite is heavy.

Very creative and extremely well executed. Looks terrific!

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post #2215 of 2571 Old 05-20-2020, 10:24 AM
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And it’s done except for hooking it up to the amp and testing it out, which will happen this afternoon, gotta give my back a break, granite is heavy.
That looks AWESOME - and goes great in the room. Nice job!

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post #2216 of 2571 Old 05-20-2020, 11:00 AM
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Just wanted to say thank you all for this amazing thread. I CAN NOT WAIT to build mine! NX3000D and driver and awaiting my to complete my son's tree house then it's off to building the box


Although, having to hook this amp up to a passive Definitive I have has allowed me the opportunity to really get to know the DSP software.
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post #2217 of 2571 Old 05-21-2020, 06:44 AM
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@mtg90 I am getting what sounds like distortion. I narrowed it down to DEQ- When I shut it off it goes away and i gain a lot of bass. All I did was load the 15hz tune file and set them to 4ohm(ipal version)


I have NO gains - Even in my MiniDSP 2X4HD i have NO positive gain. My House curve is only 3DB slope and NO gains there either.


Attached is also a sweep with it on and off, Green is ON Orange OFF
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post #2218 of 2571 Old 05-21-2020, 12:47 PM
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I everything goes well, I'll be cutting for my dual driver VBSS this weekend. I'll be aiming for a 20Hz tune, which Matt said would need a slot port of 18" deep by 2.5" high. One caveat I have though, is I am turning the box where the 28" side is the front, so I only have 20" depth. Is it safe to assume that if I put an elbow on the port and leave 2.5" the entire way that I will be good on tuning?

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post #2219 of 2571 Old 05-21-2020, 12:49 PM - Thread Starter
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@mtg90 I am getting what sounds like distortion. I narrowed it down to DEQ- When I shut it off it goes away and i gain a lot of bass. All I did was load the 15hz tune file and set them to 4ohm(ipal version)


I have NO gains - Even in my MiniDSP 2X4HD i have NO positive gain. My House curve is only 3DB slope and NO gains there either.


Attached is also a sweep with it on and off, Green is ON Orange OFF

Perhaps Behringer corrected the activation level of the DEQ in the NX series amps. Way back when I started working on the design on the Inuke 3000 I had to figure out through testing where the DEQ gain needed to be set in order to activate near full output which is on DEQ1, it had to be set to -30dB in order to come on at near the limiter which I though was strange. If they adjusted where those levels it would mess how that DEQ is supposed to work and cause limiting/loss of output when it is not supposed to.

What I would do is leave the DEQ disabled and move those filter settings (gain, frequency, quality, type) over to the regular EQ slots as long as you haven't used up all of the open slots for room correction. This will give you the frequency response as designed you just loose the output limiting function that the DEQ gave which I've had second thoughts on if it actually provides a real benefit or not.

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post #2220 of 2571 Old 05-21-2020, 01:04 PM - Thread Starter
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Originally Posted by Mocs123 View Post
I everything goes well, I'll be cutting for my dual driver VBSS this weekend. I'll be aiming for a 20Hz tune, which Matt said would need a slot port of 18" deep by 2.5" high. One caveat I have though, is I am turning the box where the 28" side is the front, so I only have 20" depth. Is it safe to assume that if I put an elbow on the port and leave 2.5" the entire way that I will be good on tuning?
If you are rotating the box 90 degrees so that the driver and ports are on the 28" side you can build a full width slot port (26.5") that is 1.75" high and 16" long with a 2" high extension or elbow at the end. With a brace running down the center as well This should give you approximately the same tuning as the narrow design.
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