DIY Sealed Subwoofer
- Thread starter aeroash
- Start date
Now thats what I would call a good sub for music. 15” and sealed.
Found this link with a few 12” ones
Best 12-Inch Subwoofers for Home Theater & Music - HomeTheaterReview
The wide selection of 12-inch subwoofer options speaks to the popularity of this size. Here are some of the best.
hometheaterreview.com
For DIY, no clue.
Have you checked out this thread?
www.hifivision.com
Something to think about!
SVS pb2000 Duals to JBL 4642a wow
Don't waste your money in svs pb2000 they lack mid bass not good for music movies sounds okish im dint measure with rew i trust my ears but placement never helped they gave only backpain. pb2000 are hyped up. So don't waste your money. Stay away take an audition to believe. I live in interior...
www.hifivision.com
Something to think about!
Yea. I’ll have to shift my cot out and sleep outside.Have you checked out this thread?
SVS pb2000 Duals to JBL 4642a wow
Don't waste your money in svs pb2000 they lack mid bass not good for music movies sounds okish im dint measure with rew i trust my ears but placement never helped they gave only backpain. pb2000 are hyped up. So don't waste your money. Stay away take an audition to believe. I live in interior...
Something to think about!
If you don't find a diy route, you can check this out. You'll need an amp to drive it. A crown amp should be able to do the job easily. You could audition it in any reputed car accessories shop.
Sony XS-NW1202S Box Subwoofer (Black) https://amzn.eu/d/6b0FM6P
MaSh
Sony XS-NW1202S Box Subwoofer (Black) https://amzn.eu/d/6b0FM6P
MaSh
Sadik only makes enclosures no? I would also like guidance on the enclosure size and driver selection.
now banned (?), kanwar had some good builds... He seemed to have good tech know how... Not sure how to reach him though.. Perhaps manav can help..
Vineethkumar01
Well-Known Member
Hi
If you are interested in learning designing the speaker by yourself,
please take a look at this post (yes it is my own thread on diyaudio):
A 3 way design study
A 3 way version to make it easier without having to split to 3.5 way, it might even be a little bit better. Looking a bit like a poor man's TAD Reference One.
Then we can all chime in with suggestions..
PS: I personally would love to see some DIY effort going on in this forum. It is mostly due to lack of it or the interest that i have shut up and not posting anything here
are you particular about 15Inch and sealed ?
if not, take a look at this https://www.soundlabsgroup.com.au/p/V-5891-Petit-Orgue/Petit+Orgue+Speaker+Kit
just remove the full range drivers, and its quite a Sub.
you can build 2 of them, one for each channel.
or stack them up.
and its very easy to build, and no box !!
Want more after some time?
Look at Grand Orgue https://www.soundlabsgroup.com.au/p/V-5892-Grand-Orgue/Grand+Orgue+Speaker+Kit
if not, take a look at this https://www.soundlabsgroup.com.au/p/V-5891-Petit-Orgue/Petit+Orgue+Speaker+Kit
just remove the full range drivers, and its quite a Sub.
you can build 2 of them, one for each channel.
or stack them up.
and its very easy to build, and no box !!
Want more after some time?
Look at Grand Orgue https://www.soundlabsgroup.com.au/p/V-5892-Grand-Orgue/Grand+Orgue+Speaker+Kit
My first preference would be for someone to build it for me.Hi
If you are interested in learning designing the speaker by yourself,
please take a look at this post (yes it is my own thread on diyaudio):
and start using speakerboxlite app. Get a few drivers simulated.A 3 way design study
A 3 way version to make it easier without having to split to 3.5 way, it might even be a little bit better. Looking a bit like a poor man's TAD Reference One.www.diyaudio.com
Then we can all chime in with suggestions..
PS: I personally would love to see some DIY effort going on in this forum. It is mostly due to lack of it or the interest that i have shut up and not posting anything here
If there are no takers for the project, then I can build an enclosure myself, with inputs from FMs for driver selection, and cabinet size.
I read your post and several others from the link you posted. It’s all Greek to me.
My requirement is a sealed box with a 15” driver, mostly for music, with the occasional “slam” for movies. I do not care for loudness. All that matters to me is tight, well-articulated bass. This will be placed in an 11’ x 11’ room.
I would highly appreciate any guidance on this project. Please understand that you’re talking to someone technically inept in this matter. I will not understand any of the technical jargon. I will try my very best to keep up. I can follow instructions well, so please let me know how to proceed.
Shooting in the dark, with zero knowledge of drivers, I came across this piece.
I also found the box suggestions as follows:
Sealed box of 3.0 cubic feet with stuffing has and F3 of 45Hz and F6 of 34Hz.
Am I on the right path?
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Vineethkumar01
Well-Known Member
@aeroash: The reason why I suggested to read only the post I linked is because other posts can be distracting to your requirement of selecting a driver for your subwoofer.
Anyway the purpose was to get introduced to speakerboxlite app which can be used on a phone. The inputs to that app can be desired box volume (from the perspective of max. sized box that can be accomodated at home). Selecting brands of drivers that one is interested in/available in the country. Selecting bass alignment like bass reflex or sealed etc. These are specifying your requirement at the highest level not going into sealed alignment nitty gritties.
Selecting drivers first may not be a good idea. As you have described in previous post, thinking of application first is the way to go (eg: you want sealed alignment, no requirement for high SPLs etc). I don't know why you are interested only in 15inch drivers though.. Why not 12inch or even 18inch?
The driver you listed maybe a good driver but maynot be naturally suitable for a sealed alignment that gives reasonably good SPL levels. For this, we need to do a simulation to understand more.. Let me try using the app and see if it gives some useful recommendations.
Anyway the purpose was to get introduced to speakerboxlite app which can be used on a phone. The inputs to that app can be desired box volume (from the perspective of max. sized box that can be accomodated at home). Selecting brands of drivers that one is interested in/available in the country. Selecting bass alignment like bass reflex or sealed etc. These are specifying your requirement at the highest level not going into sealed alignment nitty gritties.
Selecting drivers first may not be a good idea. As you have described in previous post, thinking of application first is the way to go (eg: you want sealed alignment, no requirement for high SPLs etc). I don't know why you are interested only in 15inch drivers though.. Why not 12inch or even 18inch?
The driver you listed maybe a good driver but maynot be naturally suitable for a sealed alignment that gives reasonably good SPL levels. For this, we need to do a simulation to understand more.. Let me try using the app and see if it gives some useful recommendations.
I did try the app. This was one of the drivers that showed up.
I have no space for an 18” driver in the room. I already have a 12” sealed sub. I thought I’ll dabble in something one size bigger just to see what it brings to the table when compared to my 12” sub.
Vineethkumar01
Well-Known Member
Ok.. This is good. I will do a more detailed simulation of this woofer in a sealed box once I get my personal laptop today and post here..
Linking detailed measurements of this woofer for more information
Test Bench: The SB42FHCL75-6 15” Subwoofer from SB Acoustics
In this edition of Test Bench, we characterize the SB42FHCL75-6, a 15” home audio subwoofer from OEM driver manufacturer SB Acoustics.
This one does look good as a sealed woofer
Edit:
So here are more detailed sims for a sealed box for this driver (although based on a simpler model than the klippel based results).
Box volume specs:
It says one needs to have a 105 litres volume available inside the box (with stuffing inside) for the driver to give the kind of output levels power handling etc shown in below plots
Driver in box responses
Out of all the above pictures 1st plot is the most important. In it the light blue line shows the maximum output SPLs tbat can be got out of this configuration (driver in this particular box). The black curve shows the output that can be achieved in practice if you give the driver about 180 watts of power. At this level, we are still not excusion limited or power handling limited so a bit more power can be applied to the woofer and a bit more SPL can be eeked out..
what the black curve essentially says is when you apply this much power into the woofer, you will be able to get about 98dB of SPL at 20Hz, avout 104dB of output at 30Hz and about 110dB of output at 50Hz.
I know how this bass sounds as I have 4 x Satori WO24P-8 9inch woofers in a very similar alignment at home as shown below
This bass is sort of quick. It is there one moment and then it vanishes. If the room permits, it doesn't linger around much. I really like it especially with music (i dont see many movies anyway).. Everyone may not..
If one is looking for hard hitting "chest thumping" window shaking bass, this is not the driver or the bass alignment to look for.. Now the question is who is going to make this box for making this subwooferJust as a side note, This is all assuming 2 pi radiation. In a practical scenario, with 4pi radiation one may subtract 6dB from above numbers in a worst case scenario
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Thanks @Vineethkumar01
That’s 3.7 cubic feet. That’s doable.
The box size works out to be 18” x 18” x 27”.
Does the shape of the box matter?
This is perfect! Lovely speakersI know how this bass sounds as I have 4 x Satori WO24P-8 9inch woofers in a very similar alignment at home as shown below
View attachment 71774
This bass is sort of quick. It is there one moment and then it vanishes. If the room permits, it doesn't linger around much. I really like it especially with music (i dont see many movies anyway).. Everyone may not..
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Vineethkumar01
Well-Known Member
So I made an enclosure calculation based on dimensions shown in below pic to get the volume of 105 Litres. I have roughly allocated some 2 litres for volume taken up by driver and 8 litres for volume taken up by bracing. Depending upon the bracing scheme, these numbers vary a littleThanks @Vineethkumar01
That’s 3.7 cubic feet. That’s doable.
The box size works out to be 18” x 18” x 27”.
Does the shape of the box matter?
This is perfect! Lovely speakers
I have assumed a double baffle of 36cm thickness and put only 18cm thick walls everywhere else. These numbers cam be read out from below pic.
A key aspect of woofer/subwoofer cabinet is to brace it well.. Now we want some one to draw a box with these kind of dimensions and decide the bracing scheme etc..
The below pic also shows the location frequencies of box modes. In simple words, we domt have to see (hear) those peaks that we see in the below pic. Thier locations in frequency are decided by the enclosure dimensions. For this subwoofer box, they are not much of a problem since you will be crossing it over to other speakers well below 200Hz.
Also, it is to time to start thinking about power amplifier for this, crossover/low pass filter etc.. You need a minidsp and a separate amplifier or a plate amplifier with filter cut off frequency adjustment etc for all this.
Keeping all these in mind, coming up with an estimate of cost is also important..
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rwnano
Well-Known Member
Hi aero... there's this known guy called Mr Sethi who's running firm called 4d furnishers in Delhi. He would be great to connect with and can build a value for money solution for you. DM me for his contact info
I found a drawing shared by @keith_correa on another thread. https://www.hifivision.com/threads/the-bargain-hunters-subwoofer.57800/post-855296A key aspect of woofer/subwoofer cabinet is to brace it well.. Now we want some one to draw a box with these kind of dimensions and decide the bracing scheme etc..
Will this work?
I have Crown XLS 1502 with High/Low pass filters built in. Will this work? If this works then the passive build will be relatively simpler.
What are "Vents" in the measurements? is that for a ported box?Keeping all these in mind, coming up with an estimate of cost is also important..
View attachment 71820
As long as I stick to the box's volume, I can play around with the dimensions, right?
Thanks @rwnano . @Vineethkumar01 has gotten me excited enough to execute this build myself, provided I have all the information to go ahead. Basically an idiot's guide to DIY. So far I have been able to grasp whatever has been spewed,
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Vineethkumar01
Well-Known Member
Yes. This kind of bracing scheme should work perfectly well. Also it is not much of a problem if you make the box slightly bigger. (The alignment will change a little bit but not dramatically in this case as we are already shooting for a near to max flat alignment with Q close to 0.69).
This amp seems to be able to put out a pretty good amount of power, which seems like it is more than you will ever need with this subwoofer. I haven't used this amp so no personal experience. But from the looks of it and it ability to incorporate filters also, it seems plenty fine for the purpose under consideration here.
If you notice the "number" of vents. It is kept as zero. This means it is essentially a sealed box.
Regarding dimensions, since it is a subwoofer, you can play around with the size a bit keeping the internal cabinet volume the same. Ideally we do not want box resonance modes to be in the pass band of the subwoofer (the frequencies that the subwoofer is putting out). These box modes are shown as peaks in the above graphs. Each triplet of peaks is due to the length, breadth, and depth dimensions of the box. So if you keep any two/all dimensions the same, the peaks will get aligned at the same frequency making it harder to deal with/suppress them. But in this case, with this sized box, it all seem to be above 200Hz. So ideally it wouldn't matter much..
In any case, please do share the final dimensions that you arrive at. We can just check how all these things look like w.r.t dimensions you choose..
You may also need some stuffing material for this sealed box enclosure for fine tuning the alignment if at all needed. (most commonly suggested one is fiberglass, but we can look around for alternatives if you dont like the material/have difficulties sourcing it). But that is all for much later in the process.
Posting some basic information about impact of damping materials
Data-Bass: Subwoofer Measurements
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keith_correa
Well-Known Member
The bracing does not need to be as elaborate. Bracing like this is less complex, uses less material and is as effective. And all strips can be separate ones just as long as they are glued to each other at the points they intersect.
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