The "JohnnySub" - Page 9 - AVS Forum | Home Theater Discussions And Reviews
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post #241 of 275 Old 02-21-2016, 08:57 AM
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The original design calls for 2.5" and with what you're going to use, it's probably best to stay with it that big to prevent port noise. I don't know enough to help very much with the design, but from what little knowledge I do have and if I'm right, I think your port velocity will be way too high with a 1.5".
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post #242 of 275 Old 02-21-2016, 09:10 AM
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Quote:
Originally Posted by Michael Mitten View Post
The original design calls for 2.5" and with what you're going to use, it's probably best to stay with it that big to prevent port noise. I don't know enough to help very much with the design, but from what little knowledge I do have and if I'm right, I think your port velocity will be way too high with a 1.5".
Port velocity is just above limit @1100w with a 1.5" slot, but the problem is that the driver excursion is too high with a 2.5" slot. I guess the RSS460 likes smaller cabinets.
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post #243 of 275 Old 02-21-2016, 09:19 AM
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Quote:
Originally Posted by Michael Mitten View Post
The original design calls for 2.5" and with what you're going to use, it's probably best to stay with it that big to prevent port noise. I don't know enough to help very much with the design, but from what little knowledge I do have and if I'm right, I think your port velocity will be way too high with a 1.5".
As a matter of fact, it does seem to like smaller enclosure. Here is a smaller box design where everything seems to be good according to Bass Box. Maybe the DIY gurus can chip in
Attached Files
File Type: pdf JohnnySub-BASSBOX Smaller version.pdf (930.2 KB, 61 views)

Dedicated HT | FRONTS: Sonus Faber Venere 1.5 CENTER: Sonus Faber Venere Centre SURROUNDS: Sonus Faber Venere Walls RECEIVER: Marantz SR-7010 SUBWOOFERS: DUAL 18" Dayton RSS460HO Custom Build | Behringer iNuke 6000DSP | Velodyne SMS-1 DISPLAY: JVC D-ILA RS-46 w/ 128" 16:9 1.4 TREATMENT: Custom Bass Traps and Acoustic Panels (11)
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post #244 of 275 Old 02-21-2016, 09:29 AM
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Yeah, I would hit up the gurus to help with the final design.
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post #245 of 275 Old 02-21-2016, 09:30 AM
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Quote:
Originally Posted by Michael Mitten View Post
Yeah, I would hit up the gurus to help with the final design.
Thanks for your help, you have no idea how I appreciate it!
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Dedicated HT | FRONTS: Sonus Faber Venere 1.5 CENTER: Sonus Faber Venere Centre SURROUNDS: Sonus Faber Venere Walls RECEIVER: Marantz SR-7010 SUBWOOFERS: DUAL 18" Dayton RSS460HO Custom Build | Behringer iNuke 6000DSP | Velodyne SMS-1 DISPLAY: JVC D-ILA RS-46 w/ 128" 16:9 1.4 TREATMENT: Custom Bass Traps and Acoustic Panels (11)
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post #246 of 275 Old 02-21-2016, 03:27 PM
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Here's a version with a 12dB/octave HPF at 19Hz.

I'm very curious to have some feedback from the DIY gurus here
Attached Files
File Type: pdf JohnnySub-BASSBOX SV2.1.pdf (371.9 KB, 44 views)

Dedicated HT | FRONTS: Sonus Faber Venere 1.5 CENTER: Sonus Faber Venere Centre SURROUNDS: Sonus Faber Venere Walls RECEIVER: Marantz SR-7010 SUBWOOFERS: DUAL 18" Dayton RSS460HO Custom Build | Behringer iNuke 6000DSP | Velodyne SMS-1 DISPLAY: JVC D-ILA RS-46 w/ 128" 16:9 1.4 TREATMENT: Custom Bass Traps and Acoustic Panels (11)
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post #247 of 275 Old 02-21-2016, 03:35 PM
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Quote:
Originally Posted by jsgrise View Post
Here's a version with a 12dB/octave HPF at 19Hz.

I'm very curious to have some feedback from the DIY gurus here
They've been rather quiet as of late.
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post #248 of 275 Old 02-21-2016, 03:42 PM
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Quote:
Originally Posted by jsgrise View Post
Here's a version with a 12dB/octave HPF at 19Hz.

I'm very curious to have some feedback from the DIY gurus here
I think your design should work just fine. Unless you listen at max volume all the time the slightly increased port velocity shouldn't be a problem.

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post #249 of 275 Old 02-21-2016, 03:49 PM
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I think your design should work just fine. Unless you listen at max volume all the time the slightly increased port velocity shouldn't be a problem.

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Thank you for the feedback

I was trying to find a balance between proper vent velocity and cone excursion, but I couldn't have a 2.5" port work with the RSS460HO-4, has to go no larger than 1.5"...

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post #250 of 275 Old 02-21-2016, 03:59 PM
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Quote:
Originally Posted by jsgrise View Post
Thank you for the feedback

I was trying to find a balance between proper vent velocity and cone excursion, but I couldn't have a 2.5" port work with the RSS460HO-4, has to go no larger than 1.5"...
The port height will not have any effect on cone excursion. Cone excursion is controlled mainly by enclosure size and power.

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post #251 of 275 Old 02-21-2016, 04:30 PM
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Originally Posted by squiers007 View Post
The port height will not have any effect on cone excursion. Cone excursion is controlled mainly by enclosure size and power.

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Unless BassBox Pro is somehow off or my settings are wrong, I can't have a Dayton RSS460 to work in a JohnnySub with a 2.5" slot, regardless of the length. The excursion is too high.

Dedicated HT | FRONTS: Sonus Faber Venere 1.5 CENTER: Sonus Faber Venere Centre SURROUNDS: Sonus Faber Venere Walls RECEIVER: Marantz SR-7010 SUBWOOFERS: DUAL 18" Dayton RSS460HO Custom Build | Behringer iNuke 6000DSP | Velodyne SMS-1 DISPLAY: JVC D-ILA RS-46 w/ 128" 16:9 1.4 TREATMENT: Custom Bass Traps and Acoustic Panels (11)
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post #252 of 275 Old 02-21-2016, 04:35 PM
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Quote:
Originally Posted by jsgrise View Post
Unless BassBox Pro is somehow off or my settings are wrong, I can't have a Dayton RSS460 to work in a JohnnySub with a 2.5" slot, regardless of the length. The excursion is too high.
Are you modeling the excursion with a HPF? If it's too high you may just need to lower the power...

I'm not at my computer right now or I'd model it in WinISD to check.

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post #253 of 275 Old 02-21-2016, 07:11 PM
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Quote:
Originally Posted by jsgrise View Post
I've been doing some modelling in WinISD and can't figure out how to keep cone excursion below limit.

Driver: RSS460HO-4
Box volume: 7.5CuFt
Tune f(s): 19.5Hz
Vent: 2.5"x20"x41" (approximative)

Excursion is over limit @ 1000w...
Dayton specs geometric xmax for their drivers. That's literally based on the dimensions of the voice coil and magnet assembly. There's no real issue with exceeding geometric xmax. The databass review suggests that usable xmax is closer to 20mm before noise/distortion get too large. You're barely reaching 15mm excursion; I wouldn't worry about that.
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post #254 of 275 Old 02-21-2016, 07:26 PM
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If I double the front baffle to 1.5" vs 2", would it still be better to go with 1"MDF? It's kind of a pain to find...

I'm strongly considering building a pair of JohnnySub with RSS460HO-4 powered by an iNuke 6000DSP. I would be very happy to have some feedback from owners and ear witness of this beauties.

I am a bit concern with port resonance since I heard they were around 140Hz and I plan to apply a LPF between 80Hz-100Hz. Any feedback on that too? And vent chuffing?

Thanks a 1000 times
There's no reason to use 1" MDF. Good bracing outperforms thicker walls, and is lighter and cheaper. The baffle really only needs to be doubled to support recessing the driver.

With a 2.5 x 22.5 port, 18 Hz HPF, and an RSS460HO getting 1500W, air veolicty peaks at 14 m/s. That's lower than it needs to be. 2 x 22.5 port gives 18 m/s which is fine.

Why would you be applying an LPF, or are you just referring to the AVR crossover frequency? AVRs apply an LPF automatically when speakers are set to small.
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post #255 of 275 Old 02-21-2016, 07:32 PM
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Quote:
Originally Posted by jsgrise View Post
I've been doing some modelling in WinISD and can't figure out how to keep cone excursion below limit.

Driver: RSS460HO-4
Box volume: 7.5CuFt
Tune f(s): 19.5Hz
Vent: 2.5"x20"x41" (approximative)

Excursion is over limit @ 1000w...

Where is the High Pass set? Try moving it a few Hz lower.

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Last edited by Augerhandle; 02-21-2016 at 07:48 PM.
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post #256 of 275 Old 02-21-2016, 07:50 PM
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Quote:
Originally Posted by rhodesj View Post
Dayton specs geometric xmax for their drivers. That's literally based on the dimensions of the voice coil and magnet assembly. There's no real issue with exceeding geometric xmax. The databass review suggests that usable xmax is closer to 20mm before noise/distortion get too large. You're barely reaching 15mm excursion; I wouldn't worry about that.
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Originally Posted by rhodesj View Post
There's no reason to use 1" MDF. Good bracing outperforms thicker walls, and is lighter and cheaper. The baffle really only needs to be doubled to support recessing the driver.

With a 2.5 x 22.5 port, 18 Hz HPF, and an RSS460HO getting 1500W, air veolicty peaks at 14 m/s. That's lower than it needs to be. 2 x 22.5 port gives 18 m/s which is fine.

Why would you be applying an LPF, or are you just referring to the AVR crossover frequency? AVRs apply an LPF automatically when speakers are set to small.
As seen in the attach model, it's the best I have been able to accomplish, but I have never been able to achieve a velocity peak under 22 m/s @ 1100w .

This is with a HPF @ 18Hz 12dB/octave Qx=0.8

The LPF I was talking about was indeed the AVR's.
Attached Files
File Type: pdf JohnnySub-BASSBOX SV2.1.pdf (371.9 KB, 42 views)

Dedicated HT | FRONTS: Sonus Faber Venere 1.5 CENTER: Sonus Faber Venere Centre SURROUNDS: Sonus Faber Venere Walls RECEIVER: Marantz SR-7010 SUBWOOFERS: DUAL 18" Dayton RSS460HO Custom Build | Behringer iNuke 6000DSP | Velodyne SMS-1 DISPLAY: JVC D-ILA RS-46 w/ 128" 16:9 1.4 TREATMENT: Custom Bass Traps and Acoustic Panels (11)
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post #257 of 275 Old 02-21-2016, 08:11 PM
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And another model with a 2"x20"x30" slot, I think this is the best of my model so far... I rather do 100 models than a 100 enclosures before I find the right one :roll eyes: God this is fun!

EDIT: I just added a 3rd model with a 2.5"x20"x45" slot.

Which one looks the best to you guys? Thanks
Attached Files
File Type: pdf JohnnySub-BASSBOX SV2.2.pdf (372.0 KB, 59 views)
File Type: pdf JohnnySub-BASSBOX SV2.3.pdf (372.4 KB, 59 views)

Dedicated HT | FRONTS: Sonus Faber Venere 1.5 CENTER: Sonus Faber Venere Centre SURROUNDS: Sonus Faber Venere Walls RECEIVER: Marantz SR-7010 SUBWOOFERS: DUAL 18" Dayton RSS460HO Custom Build | Behringer iNuke 6000DSP | Velodyne SMS-1 DISPLAY: JVC D-ILA RS-46 w/ 128" 16:9 1.4 TREATMENT: Custom Bass Traps and Acoustic Panels (11)

Last edited by jsgrise; 02-21-2016 at 08:18 PM.
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post #258 of 275 Old 03-24-2016, 07:01 PM
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If the Johnny sub is 32 x 24 x 24
Instead of 25.5
Seems it would be easier to apply wood veneer?
Any significant tuning loss?
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post #259 of 275 Old 03-25-2016, 11:30 AM
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Originally Posted by artyusmce View Post
If the Johnny sub is 32 x 24 x 24
Instead of 25.5 ...Any significant tuning loss?

No. Go for it.

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post #260 of 275 Old 02-16-2017, 05:52 PM
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post #261 of 275 Old 02-19-2017, 02:39 PM
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Anyone tried the Dayton UM-18 in this size? Curious how it performs, trying to decide between this and a mini-marty.
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post #262 of 275 Old 02-19-2017, 04:23 PM
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Quote:
Originally Posted by JagNL View Post
Anyone tried the Dayton UM-18 in this size? Curious how it performs, trying to decide between this and a mini-marty.
The "JohnnySub"


Will work... but UM18 will be better in a mini-marty.
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post #263 of 275 Old 02-19-2017, 06:21 PM
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Quote:
Originally Posted by IAccord99I View Post
The "JohnnySub"


Will work... but UM18 will be better in a mini-marty.
Thank you (and wow....not sure how I missed that)! Looks like some drop-off at higher ranges though not terrible. Shame because I really like the look of the UM-18 and no dust cap helps since I have kiddos running around, more debating to do!
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Quote:
Originally Posted by JagNL View Post
Thank you (and wow....not sure how I missed that)! Looks like some drop-off at higher ranges though not terrible. Shame because I really like the look of the UM-18 and no dust cap helps since I have kiddos running around, more debating to do!
yeah i was hoping for the same about the UM18.
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post #265 of 275 Old 04-05-2017, 12:45 PM
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Quote:
Originally Posted by JagNL View Post
Anyone tried the Dayton UM-18 in this size? Curious how it performs, trying to decide between this and a mini-marty.
Quote:
Originally Posted by IAccord99I View Post
The "JohnnySub"

Will work... but UM18 will be better in a mini-marty.
I have 2 Dayton UM-18s and can't quite fit a pair of MiniMarty's in my particular space. Then I was just told about the JohnnySub and figured that was the answer but now understand they need a little more volume if possible for those drivers. I could squeeze in a 36" enclosure laying on its side so I'm thinking about some sort of "JohnnySub Plus". Taking a very elementary approach & splitting the difference between the JohnnySub & MiniMarty, I get the following dimensions:

A (2) Top, Bottom 2' x 2'
B (2) Sides 2' x 36"
C (1) Back 2' x 34.5"
D (2) Front Baffle 2' x 31"
E (1) Port Bottom 2' x 20.5"
F (1) Port Back 2' x 21.75"
G (2) Bottom Rails 2.75" x 20.5"
H (2) Back Rails 2.75" x 25.25"

Any comments on this design from the pro's? Not sure if scaling the ports this way is advised.

Thanks in advance.
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post #266 of 275 Old 05-18-2017, 01:16 PM
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I had been digging for weeks and have been directed towards doing a Johnny/Marty subwoofer box build and I am very excited to try this box out.

My friend and I have one failed sealed box under our belts and are praying we get it right this time.

I was wondering if anyone could help me figure out how to solve a size constraint I have.

I am going to be running my old Audiobahn 15 inch driver AW1506Q. Specs are here w ww.the12volt.com/installbay/uploads/2002Wooferpecs.pdf

I beleave is the same driver in winisi as the AW1506T.

It appears a 6 cu ft box would be the way to go with my driver and I am also limited to 21 height total due to my screen being 21 inches off the floor.

Can anyone help me figure out the best way to build a Johnny/Marty box using that height constraint?

Thanks for all your help!!!!!
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post #267 of 275 Old 05-19-2017, 12:08 PM
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Quote:
Originally Posted by Sir Austin View Post
I had been digging for weeks and have been directed towards doing a Johnny/Marty subwoofer box build and I am very excited to try this box out.

My friend and I have one failed sealed box under our belts and are praying we get it right this time.

I was wondering if anyone could help me figure out how to solve a size constraint I have.

I am going to be running my old Audiobahn 15 inch driver AW1506Q. Specs are here w ww.the12volt.com/installbay/uploads/2002Wooferpecs.pdf

I beleave is the same driver in winisi as the AW1506T.

It appears a 6 cu ft box would be the way to go with my driver and I am also limited to 21 height total due to my screen being 21 inches off the floor.

Can anyone help me figure out the best way to build a Johnny/Marty box using that height constraint?

Thanks for all your help!!!!!


6.2 cu. ft. tuned around 28 Hz. Lay it on its side.


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post #268 of 275 Old 05-22-2017, 07:37 AM
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Augerhandle you are a rock star!!!! I can't thank you enough for your reply. I will be building that box hopefully in a couple of weeks! I'm excited to give this subwoofer a new life. I did hook up my Inuke 3000 again and let Audyssey do its thing and was surprised with the results of my 3 cu ft box I currently have built. It still is missing in the lower frequency's so this should be the winning combo.

I truly appreciate your help!!
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post #269 of 275 Old 05-22-2017, 11:20 AM
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Augerhandle you are a rock star!!!! I can't thank you enough for your reply. I will be building that box hopefully in a couple of weeks! I'm excited to give this subwoofer a new life. I did hook up my Inuke 3000 again and let Audyssey do its thing and was surprised with the results of my 3 cu ft box I currently have built. It still is missing in the lower frequency's so this should be the winning combo.

I truly appreciate your help!!



YW
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post #270 of 275 Old 05-22-2017, 02:35 PM
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YW
Auger. I have been drawing out a cut sheet for this box. It appears to be confusing as far as the port back has no measures and I can't seem to figure out what the math would be on that. I am still very grateful for you help. How hard would it be to make the box a little longer and a little thinner. 21x21x3-? If its a pain I am good building the one you supplied because it is almost exactly what I was looking to for = )
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