The V.B.S.S. DIY subwoofer design thread - Page 75 - AVS Forum | Home Theater Discussions And Reviews
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post #2221 of 2615 Old 05-21-2020, 01:19 PM
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Originally Posted by mtg90 View Post
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.

Sounds good, Ill give that a try. Thanks- I tested with it off with hevy bass demos like Edge of tomorrow and they seem to take it like a champ. Once my 4yo gets her Aquaman fix over with ill sweep with your suggestions Also running VBSS as dual is FLIPPING insane! Absolutely violent-If you get board do it lol, only draw back is port goes choo choo under heavy XLF 10HZ and under.
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post #2222 of 2615 Old 05-22-2020, 04:11 AM
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@mtg90 This is with the 14db @ 20hz DEQ removed and added to PEQ. On and Off cant set they type as there is no option for BP. Not sure if I should be adding DEQ #2 also..


Thnk If i do have it on I need to lessen the steepness of my house curve
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post #2223 of 2615 Old 05-22-2020, 05:46 AM
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@mtg90 if by chance you have time, can you please take a look at the cab dimensions below. What will be the port length on a 15/20hz tuning?

External dims:
H = 25"
W = 22.5"
D = 26.6

I am height restricted due to PJ screen. The outer box measurements is pretty much close to the orig plan.

Thanks
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post #2224 of 2615 Old 05-22-2020, 07:48 AM
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Originally Posted by BenjiboyZ28 View Post
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.
Welcome to the rabbit hole



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Originally Posted by Remy.Alexander View Post
@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
I had the same issue when I first hooked mine up. The signal was clipping with DEQ active. I disabled DEQ and haven't had the issue come back, but I'd like to dig in and find out what the source was. In hindsight, I may have had the gain knobs too low in the initial testing (about 25%). Once getting everything dialed in, gain knobs are set to 55%. Not exactly sure how that could affect clipping though

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post #2225 of 2615 Old 05-22-2020, 10:44 AM - Thread Starter
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Originally Posted by Remy.Alexander View Post
@mtg90 This is with the 14db @ 20hz DEQ removed and added to PEQ. On and Off cant set they type as there is no option for BP. Not sure if I should be adding DEQ #2 also..


Thnk If i do have it on I need to lessen the steepness of my house curve
BP = PEQ

You should copy over the filter settings from the 2nd DEQ filter as well.
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post #2226 of 2615 Old 05-22-2020, 10:46 AM - Thread Starter
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Quote:
Originally Posted by AngryJeremy View Post
I had the same issue when I first hooked mine up. The signal was clipping with DEQ active. I disabled DEQ and haven't had the issue come back, but I'd like to dig in and find out what the source was. In hindsight, I may have had the gain knobs too low in the initial testing (about 25%). Once getting everything dialed in, gain knobs are set to 55%. Not exactly sure how that could affect clipping though
Do you have an NX3000 as well?
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post #2227 of 2615 Old 05-22-2020, 11:02 AM
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Originally Posted by mtg90 View Post
Do you have an NX3000 as well?
Yeah NX3000D bought last November from Parts Express

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post #2228 of 2615 Old 05-22-2020, 11:27 AM - Thread Starter
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Quote:
Originally Posted by weng2x View Post
@mtg90 if by chance you have time, can you please take a look at the cab dimensions below. What will be the port length on a 15/20hz tuning?

External dims:
H = 25"
W = 22.5"
D = 26.6

I am height restricted due to PJ screen. The outer box measurements is pretty much close to the orig plan.

Thanks
You could use the slot port length given in the first post with your cabinet, it won't change much making it 1" wider, you just ave to adjust the size of the panels to fit the added depth of your box.
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post #2229 of 2615 Old 05-22-2020, 11:55 AM - Thread Starter
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Alright I've uploaded a separate DSP zip file for the NX series amps that moves the DEQ filters over to regular PEQ. This should eliminate the distortion issue on the NX amps.

I'd advise anyone using an NX3000 (or 1000 / 6000) to update to those new DSP files.

Last edited by mtg90; 05-22-2020 at 12:02 PM.
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post #2230 of 2615 Old 05-22-2020, 02:03 PM
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Quote:
Originally Posted by mtg90 View Post
Alright I've uploaded a separate DSP zip file for the NX series amps that moves the DEQ filters over to regular PEQ. This should eliminate the distortion issue on the NX amps.

I'd advise anyone using an NX3000 (or 1000 / 6000) to update to those new DSP files.
Thanks, mtg90
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post #2231 of 2615 Old 05-22-2020, 02:26 PM
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Quote:
Originally Posted by mtg90 View Post
Alright I've uploaded a separate DSP zip file for the NX series amps that moves the DEQ filters over to regular PEQ. This should eliminate the distortion issue on the NX amps.

I'd advise anyone using an NX3000 (or 1000 / 6000) to update to those new DSP files.

Thanks ill chek them out also. Glad im not the only one experiencing it. Thought I was insane


These dual VBSS-Ipal Versions are seriously insane. If you look at my last graph 10hz-20hz is untouched....it was flat in room and they are loud i ave mine -15 already in minidsp and they still over power the entire system
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post #2232 of 2615 Old 05-22-2020, 04:38 PM
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Quote:
Originally Posted by mtg90 View Post
Alright I've uploaded a separate DSP zip file for the NX series amps that moves the DEQ filters over to regular PEQ. This should eliminate the distortion issue on the NX amps.

I'd advise anyone using an NX3000 (or 1000 / 6000) to update to those new DSP files.
Thanks mtg90. Dual VBSS builds in progress. Amp should be here next week. Hoping to have sub's finished next weekend.
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post #2233 of 2615 Old 05-22-2020, 05:32 PM
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Getting there... thanks mtg90!!

The keen eye may notice that the baffle plate is 1" (the two on the right in the bottom pic). One of my pieces fell off the sawhorse and the edge got messed up. Likely could have fixed but I had plenty of extra 1/2" MDF so I just doubled up the 1/2" and now have a 1" baffle plate.

Oh, and as I had extra material I figured I'd make windowbox type bracing. I'm not exactly sure about this. With the thicker baffle plate the ports are a little farther off the back wall then mtg90's design - but with the extra bracing one of the supports it close to the ports. Not sure if this will help or create issues. If it's an issue I can remove.

Plan is to put eggcrate mattress topper in the top two bays (sides and back), but leave the bottom bay empty. Let me know if I should but any in that bay - sides or on the bottom - I know I shouldn't put any behind the ports - just not sure about the sides or bottom.




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post #2234 of 2615 Old 05-22-2020, 05:35 PM
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Quote:
Originally Posted by mtg90 View Post
Alright I've uploaded a separate DSP zip file for the NX series amps that moves the DEQ filters over to regular PEQ. This should eliminate the distortion issue on the NX amps.



I'd advise anyone using an NX3000 (or 1000 / 6000) to update to those new DSP files.
*should* all nx amp users experience this problem...?

I don't think I've had any issues running with the original files thru my nx3000d.

What does the issue sound like?

I'm running slim 20hz cabs w/ Pa460's

Sent from my Pixel 2 XL using Tapatalk
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post #2235 of 2615 Old 05-22-2020, 05:37 PM
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My wife informed me today that we're doing our summer vacation starting Monday (we had to change plans and weeks due to COVID-19) so I guess I won't get to work on the Dual Driver VBSS as much as I thought this weekend. I'll be looking forward to checking out your builds and maybe I can work on mine some week after next.

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post #2236 of 2615 Old 05-22-2020, 05:37 PM
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Quote:
Originally Posted by DavidinGA View Post
*should* all nx amp users experience this problem...?

I don't think I've had any issues running with the original files thru my nx3000d.

What does the issue sound like?

Sent from my Pixel 2 XL using Tapatalk
curious as well.
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post #2237 of 2615 Old 05-22-2020, 07:50 PM
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I couldn't figure out how to search this thread to find my answer, but what's the best way to wire four VBSS to an NX3000D? I'm doing two up front and two near field. Thanks all!
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post #2238 of 2615 Old 05-22-2020, 08:56 PM
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I couldn't figure out how to search this thread to find my answer, but what's the best way to wire four VBSS to an NX3000D? I'm doing two up front and two near field. Thanks all!
Run them in stereo (use both amp channels) so you can EQ both pair separately. Run each pair in parallel to make it a 4ohm load and you don't have to mess with the voltage limiter number.

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This is my first DIY Sub build. Going to put 4-18" Ultimax's in. Anything I should know? I hope they sound good... I primed them today. So many hours in the build.

I was told they may not be as punchy given how big they are (16.5 cu ft).
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post #2240 of 2615 Old 05-22-2020, 08:59 PM
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Originally Posted by joker927 View Post
Run them in stereo (use both amp channels) so you can EQ both pair separately. Run each pair in parallel to make it a 4ohm load and you don't have to mess with the voltage limiter number.

Sent from my ONEPLUS A6013 using Tapatalk

Awesome, thanks for the quick reply!
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post #2241 of 2615 Old 05-22-2020, 09:00 PM
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Quote:
Originally Posted by mtg90 View Post
Quote:
Originally Posted by weng2x View Post
@mtg90 if by chance you have time, can you please take a look at the cab dimensions below. What will be the port length on a 15/20hz tuning?

External dims:
H = 25"
W = 22.5"
D = 26.6

I am height restricted due to PJ screen. The outer box measurements is pretty much close to the orig plan.

Thanks
You could use the slot port length given in the first post with your cabinet, it won't change much making it 1" wider, you just ave to adjust the size of the panels to fit the added depth of your box.
Thanks.

So, the port dims will be
H = 1.5"
W = 21.0"
D = 28.0"

And still keep 1.5" distance from the back wall before making the bend.

I can make the cut sheet now 🙂
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post #2242 of 2615 Old 05-22-2020, 09:19 PM
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Guys, the Tymphany FSL 18 is on sale at PE. Would it work for a VBSS?

Rated 9.5mm Xmax which is a lot more than the PA460?

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post #2243 of 2615 Old 05-22-2020, 10:27 PM - Thread Starter
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Thanks.

So, the port dims will be
H = 1.5"
W = 21.0"
D = 28.0"

And still keep 1.5" distance from the back wall before making the bend.

I can make the cut sheet now 🙂
That's correct.
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post #2244 of 2615 Old 05-22-2020, 10:39 PM - Thread Starter
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Quote:
Originally Posted by DavidinGA View Post
*should* all nx amp users experience this problem...?

I don't think I've had any issues running with the original files thru my nx3000d.

What does the issue sound like?

I'm running slim 20hz cabs w/ Pa460's

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Quote:
Originally Posted by 5js View Post
curious as well.
I don't actually know what it sounds like on an affected NX3000 but I can guess based on what the limiter or compressor used in the DEQ sounds like when overdriven which is a a crunchy/pulsating noise instead of clean bass. One quick test is to just disable the DEQ filters and if deep bass sounds cleaner and louder you know to switch to the new DSP files. If the deep bass gets quieter with DEQ disabled you can most liekly stick with the inuke settings.

I don't know if this is an issue across all NX3000's (or all NX amps) or only affects select few but the new NX DSP files are safe to use for all of those amplifiers. Basically if your unit isn't affected and you update it won't really sound any different.
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post #2245 of 2615 Old 05-22-2020, 11:57 PM
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Quote:
Originally Posted by mtg90 View Post
Quote:
Originally Posted by weng2x View Post
Thanks.

So, the port dims will be
H = 1.5"
W = 21.0"
D = 28.0"

And still keep 1.5" distance from the back wall before making the bend.

I can make the cut sheet now 🙂
That's correct.
Thanks again 🙂
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post #2246 of 2615 Old 05-23-2020, 05:40 AM
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Like MTG90 said youll have a loss of bass, and itll be crunchy.. Mine was crunchy over-driven sound, it was nasty.
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post #2247 of 2615 Old 05-23-2020, 06:26 AM
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Quote:
Originally Posted by mtg90 View Post
I don't actually know what it sounds like on an affected NX3000 but I can guess based on what the limiter or compressor used in the DEQ sounds like when overdriven which is a a crunchy/pulsating noise instead of clean bass. One quick test is to just disable the DEQ filters and if deep bass sounds cleaner and louder you know to switch to the new DSP files. If the deep bass gets quieter with DEQ disabled you can most liekly stick with the inuke settings.



I don't know if this is an issue across all NX3000's (or all NX amps) or only affects select few but the new NX DSP files are safe to use for all of those amplifiers. Basically if your unit isn't affected and you update it won't really sound any different.
Ok thanks.

I guess mine isn't affected, so I won't mess with it, but for reference...how many peq slots does this fix use up should I ever need it?

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--------------------------------------------------
Epson 5040, 150" 16:9 1.1gain, Source: HTPC w/madVR, 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. 4 diy Slim VBSS 18" Subs w/NX3000D.
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Quote:
Originally Posted by mtg90 View Post
Slot port version.

2.5" high x 18" long slot port gives ~20hz tuning. Make it 7" long for the 30hz tune. For 15Hz you want the port to be 1.75" high and 24" long.

Drivers centers 12" down from top and 12" up from top of slot port.

Any issues if I mount the drivers on the 28" side to have a slim 20" build? Do I need to change the port orientation or can it still be off to the side?


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post #2249 of 2615 Old 05-23-2020, 07:58 AM
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Any issues if I mount the drivers on the 28" side to have a slim 20" build? Do I need to change the port orientation or can it still be off to the side?



I'm putting my drivers on the 28" side as I only have 24" behind my screen. I'm moving my port too, which Matt said would keep the 20Hz tune at 1.75" by 18". The port being on the side rather than the front might look a little odd, but I don't see any reason why it wouldn't work fine.

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 #2250 of 2615 Old 05-23-2020, 08:00 AM
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Any issues if I mount the drivers on the 28" side to have a slim 20" build? Do I need to change the port orientation or can it still be off to the side?





Zero issues- I have mine 28H 20D 48L and they are insane almost to much bass
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