Modular 1x12 Servo OB Sub enclosures

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jmimac351

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Modular 1x12 Servo OB Sub enclosures
« on: 16 Apr 2024, 01:12 pm »
Hi, sorry if I've missed discussion of these 12", single unit servo sub enclosures.  I've seen some pictures on FaceBook.  Just wondering if I'm missing anything with this direction.  Is it what it looks like... modular 12" sub enclosures that you can move around / stack, put on the floor side by side, etc.  And also have the ability to "grow" the amount of bass you want / need.  It appears they have provisions to bolt together to help rigidness / stability.

If someone wanted a Double setup... 2-12" woofer per side, is there any performance disadvantage to doing this modular route vs having the single, dual 12" driver enclosure?

Any chance to put a tape measure to a pair of these single units stacked, for the overall height of a pair of them?

These appear to make a lot of sense... wondering what I'm missing...if anything.

Thanks for sharing this!  I didn't realize they existed.




HAL

Re: Modular 1x12 Servo OB Sub enclosures
« Reply #1 on: 16 Apr 2024, 03:26 pm »
Hi, sorry if I've missed discussion of these 12", single unit servo sub enclosures.  I've seen some pictures on FaceBook.  Just wondering if I'm missing anything with this direction.  Is it what it looks like... modular 12" sub enclosures that you can move around / stack, put on the floor side by side, etc.  And also have the ability to "grow" the amount of bass you want / need.  It appears they have provisions to bolt together to help rigidness / stability.

If someone wanted a Double setup... 2-12" woofer per side, is there any performance disadvantage to doing this modular route vs having the single, dual 12" driver enclosure?

Any chance to put a tape measure to a pair of these single units stacked, for the overall height of a pair of them?

These appear to make a lot of sense... wondering what I'm missing...if anything.

Thanks for sharing this!  I didn't realize they existed.



These are the standard modular open baffle H-Frame flat pack modules that captainhemo makes for the GR-Research 12in OB servo driver.  Basically the same dimensions as the full cabinets, but modular so you do not have to move heavy cabinets as the modules with servo drivers in full cabinets.  They have been around for a few years and there are threads here on other builds I have done of them.  With the top on, a 2x12 stack is at 31.25in high from base to top cap.

There are a few different top cap versions that he makes so that depends on the look the customer wants.  I have both the tops with overhand and flush fit for different sub towers.

These are designed to go with the Rythmik Audio A370 and HX300 OB series servo amps.

The picture is me building up two 6x12in modular servo sub stacks for my room.  These will be painted once completed with an automotive Hot Rod Black.  Just completed gluing the first 6 modules.

There is no performance difference.  The good part is that it can be made as a 2x12 and later expanded to more modules if wanted.  I have them for doing shows as they can be wired to the servo amps in either 2, 3 or 4x12 driver configurations.  For a 6x12 configuration two servo amps are needed.

Hope that helps.

jmimac351

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Re: Modular 1x12 Servo OB Sub enclosures
« Reply #2 on: 16 Apr 2024, 11:59 pm »

Hope that helps.

It did very much!  Thank you!

HAL

Re: Modular 1x12 Servo OB Sub enclosures
« Reply #3 on: 17 Apr 2024, 12:02 am »
You are welcome.

Will post some other pictures in this thread as I get them assembled and painted.  Up to module #7.    :D

Jaytor

Re: Modular 1x12 Servo OB Sub enclosures
« Reply #4 on: 17 Apr 2024, 01:29 pm »
Here's a photo of my quad modular subs.



And hers a photo with the overhanging top plate. I prefer the flush look.




Nick B

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Re: Modular 1x12 Servo OB Sub enclosures
« Reply #5 on: 17 Apr 2024, 06:31 pm »
Here's a photo of my quad modular subs.



And hers a photo with the overhanging top plate. I prefer the flush look.




Those are very nice. This is your work or you had someone build these?
Nick

Jaytor

Re: Modular 1x12 Servo OB Sub enclosures
« Reply #6 on: 17 Apr 2024, 07:33 pm »
Those are very nice. This is your work or you had someone build these?
Nick

The cabinets were made by captainhemo and he had them painted by his local paint shop before I picked them up. I installed the drivers, wired them up, built the crossovers for the Line Forces and made the grills for the subs. 

kaplanent

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Re: Modular 1x12 Servo OB Sub enclosures
« Reply #7 on: 17 Apr 2024, 08:47 pm »
Hi Jaytor,

Magnificent execution of the quad servo subs and line force arrays.
If you've never heard this type of setup before you must have been stunned at the sound quality of properly recorded vocals, low distortion and realistic sound-stage.
I've only finished mine about 2 months ago.

I have a few questions if you don't mind sharing?

1. Are you driving each servo stack with the A370PEG servo amp?
    I though these would only work with 3 paralleled drivers. 4 drivers is 4 ohms, so I think it would work, but I read 3 only.

2. How does the line force sound with the straight wing?
    I designed mine with a straight wing, as It's cleaner to fabricate.
    I have them slightly toed in.
    I think it sounds amazing. But I have no way to compare.

3. Are you using the original B&G's, clones or a combination?
    I bought up enough of the B&G's over 2 years to finally finish them.

I also designed my servo sub stacks modular as a double 4, but with the bottom cube used for the amp only.
It keeps the wiring very short.
I would like to add the fourth sub to each.

I designed the line force to be modular with three panels each with 2 Neo10's and 6 Neo3's.
So much easier to move. I can assemble and disassemble in about a half hour. (I used blind mate connectors.)

Here are some pictures:
The subs are unfinished as they are behind the screen.
I'm going to add the center channel using the GRS clones.
It would still be better than the center I'm using now.




Assembled in front of the screen to do initial testing.


And a picture during assembly.


Thanks,

Alan

Jaytor

Re: Modular 1x12 Servo OB Sub enclosures
« Reply #8 on: 17 Apr 2024, 11:10 pm »
Hi Jaytor,

Magnificent execution of the quad servo subs and line force arrays.
If you've never heard this type of setup before you must have been stunned at the sound quality of properly recorded vocals, low distortion and realistic sound-stage.
I've only finished mine about 2 months ago.

I have a few questions if you don't mind sharing?

1. Are you driving each servo stack with the A370PEG servo amp?
    I though these would only work with 3 paralleled drivers. 4 drivers is 4 ohms, so I think it would work, but I read 3 only.

2. How does the line force sound with the straight wing?
    I designed mine with a straight wing, as It's cleaner to fabricate.
    I have them slightly toed in.
    I think it sounds amazing. But I have no way to compare.

3. Are you using the original B&G's, clones or a combination?
    I bought up enough of the B&G's over 2 years to finally finish them.

I also designed my servo sub stacks modular as a double 4, but with the bottom cube used for the amp only.
It keeps the wiring very short.
I would like to add the fourth sub to each.

I designed the line force to be modular with three panels each with 2 Neo10's and 6 Neo3's.
So much easier to move. I can assemble and disassemble in about a half hour. (I used blind mate connectors.)

Here are some pictures:
The subs are unfinished as they are behind the screen.
I'm going to add the center channel using the GRS clones.
It would still be better than the center I'm using now.




Assembled in front of the screen to do initial testing.


And a picture during assembly.


Thanks,

Alan

Nice system.

I'm using HX800XLR amps. Each of these has two 400w amps which are connected to two drivers.

The wings on my Line Forces are at an angle (I'd guess around 80 degrees). I've included a couple photos of the back below. I'm using BG Neo10s which I purchased from Parts Express right before they became unavailable. I have a few spares in case I have driver failures in the future. The tweeters are GR-Research  NEO3s.

I'm currently using a passive crossover, but I'm planning to experiment with active in the near future. I've been super busy with work and recovering from knee replacement surgery so haven't gotten very far yet. But I have a Danville Nexus 2/8 and a Sublime Acoustic K235 to experiment with. I'm currently building a pair of stereo amps based on Nelson Pass's F5M circuit to try driving them with the active crossovers.








HAL

Re: Modular 1x12 Servo OB Sub enclosures
« Reply #9 on: 17 Apr 2024, 11:28 pm »
Building new 6x12 OB H-Frame servo sub cabinets from captainhemo.

Some modular 1x12 cabinets build pictures for the thread:








jmimac351

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Re: Modular 1x12 Servo OB Sub enclosures
« Reply #10 on: 18 Apr 2024, 12:36 am »
I sure am glad I asked about these modular sub enclosures!  This stuff is great and it seems like the best way to go.  The finished product doesn't look "pieced together"... it looks complete.  And you can grow into them to suit taste / space / investment. 

I have a "early prototype" of the NX-MTM that I am going to get after soon.  One of the things I've seen with how that's been done is to use the OB enclosure as a stand... but there are challenges with that, some are aesthetic. 

My lack of awareness of these modular units made that option a bit more difficult to "buy-in"... Double, Triple... which is the right choice / commitment. 

With these modular units, I think I'll be able to dial-in what I like... and also have some creative placement.  What if there were 2 or three on the floor, horizontally... then the NX-MTM on a stand that is "floated" on-center / over the sub enclosures below.  My Wilson Duette stand is built that way... if turned around, the speaker is projected forward, relative to the center column. The base would slide UNDER the sub, with the NX-MTM on the stand offset forward OVER the subs, not sitting behind them.

This modular route seems like the obvious choice.

Early B.

Re: Modular 1x12 Servo OB Sub enclosures
« Reply #11 on: 18 Apr 2024, 03:23 am »
With these modular units, I think I'll be able to dial-in what I like... and also have some creative placement.  What if there were 2 or three on the floor, horizontally... then the NX-MTM on a stand that is "floated" on-center / over the sub enclosures below.  My Wilson Duette stand is built that way... if turned around, the speaker is projected forward, relative to the center column. The base would slide UNDER the sub, with the NX-MTM on the stand offset forward OVER the subs, not sitting behind them.

This modular route seems like the obvious choice.

The "floating MTM" sounds like a great idea. I have an OB servo sub lying horizontally in the middle of my speakers. I think it sounds slightly better upright. I believe since the OB servo sub is playing higher than typical box subs, they're more localizable, so the bass will sound like it's coming from the floor. It's a minor consideration, but worth mentioning.

If I could design your speaker setup, I'd sandwich each of the NX-MTMs between the OB servo subs with two on the bottom and a floating one on top. The "NX-MTM Triple X" would be the envy of the audio world. 

HAL

Re: Modular 1x12 Servo OB Sub enclosures
« Reply #12 on: 18 Apr 2024, 11:36 am »
If you are looking for a smaller footprint servo sub, I showed a modular 4x8in servo sub at CAF2023 with a pair of Magnepan MG10/QR speakers I modified for bi-amp and dspNexus 2x8 DSP crossover.  I built prototypes for the show from one style of flat pack cabinet.  The cabinets need refinement to look better but work correctly.

They go down to 30Hz with the 8in servo driver instead of the 16Hz with 12in servo drivers in the larger H-Frames.



HAL

Re: Modular 1x12 Servo OB Sub enclosures
« Reply #13 on: 18 Apr 2024, 03:54 pm »
The #12 1x12 servo sub H-Frame is glued and drying.

Looks like early May to get the Hot Rod Black painting started for the modules, bases and tops.  :)



HAL

Re: Modular 1x12 Servo OB Sub enclosures
« Reply #14 on: 18 Apr 2024, 09:00 pm »
The module tops and bottoms are bolted on to the H-Frame.

As Jaytor showed the top styles are interchangeable


.

jmimac351

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Re: Modular 1x12 Servo OB Sub enclosures
« Reply #15 on: 18 Apr 2024, 09:56 pm »

If I could design your speaker setup, I'd sandwich each of the NX-MTMs between the OB servo subs with two on the bottom and a floating one on top. The "NX-MTM Triple X" would be the envy of the audio world.

I thought of this as well!!!... having a third sitting on top of one of them.  And the cool part is I'm not married to a huge cabinet.  I really like 2-way speakers, so I'll be able to mix / match / move stuff around. This same sort of thing could work well for NX-Studio.

jmimac351

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Re: Modular 1x12 Servo OB Sub enclosures
« Reply #16 on: 18 Apr 2024, 10:20 pm »
If you are looking for a smaller footprint servo sub, I showed a modular 4x8in servo sub at CAF2023 with a pair of Magnepan MG10/QR speakers I modified for bi-amp and dspNexus 2x8 DSP crossover.  I built prototypes for the show from one style of flat pack cabinet.  The cabinets need refinement to look better but work correctly.

They go down to 30Hz with the 8in servo driver instead of the 16Hz with 12in servo drivers in the larger H-Frames.

Thanks for sharing.  I've been following via FB what you've been doing with those.  The thought occurred to me that it would be similar to the "Otica with 3-8" OB subs" that is being developed.  It occurred to me that with the NX-MTM I could have the same thing in a modular form... and even better with the 12".  Right now I have dual SVS SB16-Ultra subs.  Last month, I heard Danny's system.  The OB sub sound is a very cool thing... there is no doubt about that, and at the same time I was eyeballing the size of the Triple cabinets.  This modular stuff makes it very, very interesting for the NX-MTM and I do know that I'm going to want more bass than the 8".  My room will definitely support / need it. 

Here's the thing... prior to buying the NX-MTM (and even after) I'd read feedback about how the NX-Otica is preferred by some over the NX-MTM... that it's a bit fuller in the mid-bass.  As I was looking at the Rythmik amps closer, I see the high pass limited to 120Hz.  Well, the NX-MTM want to high pass at 150-200Hz.  I thought... "well that's the problem right there!".  Using the OB subs with NX-MTM is perhaps leaving a bit of weakness there where the NX-MTM needs a bit of help... it's not able to dial in more mid-bass punch.  Passing the subs higher is also why them being modular and placed right under / around the NX-MTM I thought would work well. 

Hopefully I'm wrong about this high pass limitation with the OB in terms of how it will integrate with the NX-MTM, and whether that's why some have mentioned their preference for the Otica with the additional 4 integral woofers.

I'm still trying to do my homework on it and too dumb (I like trying to figure stuff out) to just call Danny.  :scratch: :duh:

jmimac351

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Re: Modular 1x12 Servo OB Sub enclosures
« Reply #17 on: 18 Apr 2024, 10:55 pm »
Well, I just called Danny and he says no problem... apparently they can play up to 300Hz or some such.  I described the idea with these modular units on either side of a stand and he thought it would work great.

He did mention something to keep an eye on is how much you separate these modular units... they need to stick close together.  That's fine with what I'm looking at doing.

I'm going to mockup how it might look.

HAL

Re: Modular 1x12 Servo OB Sub enclosures
« Reply #18 on: 25 Apr 2024, 11:34 am »
The two 6x12 OB H-Frame stacks are completed.

Taking them next week for the Hot Rod Black paint to complete the build.  The last 6 GR-Research SW-12-16FR subs arrive this week for install once the 1x12's are painted.

BrandonB

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Re: Modular 1x12 Servo OB Sub enclosures
« Reply #19 on: 26 Apr 2024, 07:51 pm »
Here's a photo of my quad modular subs.



And hers a photo with the overhanging top plate. I prefer the flush look.



How did you paint your subs?  They almost look like they are sanded and sealed natural from the pick.