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Elite Shackster
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Discussion Starter · #1 ·
I'm currently building a sealed sub for someone and thought I would share it with you guys and get a bit of a critique if needed. You'll have to excuse any pics of poor quality as I had an issue with the camera half way through the build and had to use my phone for some of them. Its almost complete now, so I'll post pics of the finished article soon.

Hope you enjoy and find it useful :T

Cheers

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Elite Shackster
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Discussion Starter · #3 ·
It is, they seem to be gaining a little popularity in the UK, probably due to a bit of attention myself on a couple others gave them. The first sub I built using these was pretty good for me so Ive stuck with them.

I do have ideas on trying some other drivers out at some point, but not for a little while yet.
 

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Looks really good mate. Very impressed. Be interesting what other drivers you have in mind and what type of sub, i.e: sealed, ported etc.....

I have been very interested in Mark Seatons new Terraform XL which has the two 15" subs and 2 18" PR's and a big slot port. Its the idea I find very intersting.

cheers


Graham
 

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Elite Shackster
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7,142 Posts
Discussion Starter · #6 ·
Is it the 15X or the 15H?
Its the X model.
Looks really good mate. Very impressed. Be interesting what other drivers you have in mind and what type of sub, i.e: sealed, ported etc.....

I have been very interested in Mark Seatons new Terraform XL which has the two 15" subs and 2 18" PR's and a big slot port. Its the idea I find very intersting.

cheers


Graham
Thats got to be one of a design headache. It sounds more like he's trying to build 2 subs in one to get a couple different tunes and get a better response with more output. See what the reviews are like when it lands.

I want to try a couple ported designs, partly just to be thorough. I like the look of the Soundsplinter divers, and I also fancy something daft just for fun, but its a long shot if that'll every happen. I also want to try a sealed twin driver cylinder sub to see how that works as a design.
 

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Elite Shackster
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7,142 Posts
Discussion Starter · #8 ·
I'm actually going to do a ported 15" sub soon, and that will be veneered. Its being made to match a set of Mordant Short speakers. The guys who wants me to build it actually is considering having 2.
 

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The terraform XL is a variation on a 6th order design. One of the ports is replaced with PR's, useful when you can't get the port area you need.
 

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Elite Shackster
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7,142 Posts
Discussion Starter · #12 ·
It looks though as if the pr's fire into the internals of the port. Maybe not and I need to look closer, but either way its a beast.
 

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Elite Shackster
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Discussion Starter · #14 ·
That actually makes more sense, and had I paid attention to what Ricci has said about it being a variation on a 6th order Bandpass design the penny would have dropped. Its a design Bose use a lot with small 6" drivers (I think they claim to have invented it) and for what they are the results are decent.

I can only expect doing it on this scale would be nothing short of spectacular. If I'm not mistaken Bose also follow this design on a larger scale, and they seem to impress people. I would expect Mark Seaton to offer much better VFM and results.
 

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Dan I was wondering how easy that would be to diy but with my two FIs and two 18" PRs and a slot port tuned very low. I wouldnt even know where to start with regards to modelling it. Im very curious. That sub is $3500 to buy.

graham
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Elite Shackster
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7,142 Posts
Discussion Starter · #17 ·
Dan I was wondering how easy that would be to diy but with my two FIs and two 18" PRs and a slot port tuned very low. I wouldnt even know where to start with regards to modelling it. Im very curious. That sub is $3500 to buy.

graham
Posted via Mobile Device
Just model a 6th order design in WinISD to get an idea of how it works. The hard bit would be swapping your ports for pr's, which you would almost certainly need to do. If you could do it with just ports you'll make the project cheaper, but I'm not entirely sure why you would want to do this.

I get the feeling part of the reason Bose use this design is to employ a low pass filter into the design of the sub itself and allow the sub to integrate with their sats better. The Bose design philosophy is one on its own. I'm not sure why Mark has chosen that design, although Bose reckon any distortion from the drivers is all caught inside the chambers inside the cabinet leading to a cleaner sound. I can only assume that is the part Mark is interested in. He's obviously chasing max spl, max depth and max clean signal.
 

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Elite Shackster
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7,142 Posts
Discussion Starter · #18 ·
Dan I was wondering how easy that would be to diy but with my two FIs and two 18" PRs and a slot port tuned very low. I wouldnt even know where to start with regards to modelling it. Im very curious. That sub is $3500 to buy.

graham
Posted via Mobile Device
Lookin very professional Dan, did u do the spraying urself?
Ive done everything barring the final spray. The spraying bit takes all of a couple minutes, the prep work takes several hours. The place its done is at a garage that a friend owns, and he does the final spray coating in his spray booth.
 

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Dan,

Bose uses an 8th order BP. :T That's their patented acoustimass dealio. Basically take the 6th order BP and where you have the 2 ports or PR's, one from each chamber, instead of hitting the outside world they vent into a 3rd chamber, which is itself tuned with PR's or ports. There are 2 freeware programs that I know of that will model these (8th order). They are very tricky though. WinISD can do 6th order.
 

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Elite Shackster
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7,142 Posts
Discussion Starter · #20 ·
Ah, interesting. Ive not looked into the Bose design closely enough I guess. I wander how that design would work if applied to a sub with proper drivers and amplification.
 
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