90 litre single 15" driver project. - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #11 of 48 Old 03-23-10, 09:57 AM
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Re: 90 litre single 15" driver project.

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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post #12 of 48 Old 03-23-10, 10:04 AM Thread Starter
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Re: 90 litre single 15" driver project.

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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post #13 of 48 Old 03-23-10, 10:40 AM
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Re: 90 litre single 15" driver project.

Dan,

The PR's are on the outside and the drivers are firing directly behind them so all you see on the outside is the PR's. Very unusual.

Its certainly a beast.

cheers

Graham

Last edited by gperkins_1973; 03-23-10 at 11:06 AM.
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post #14 of 48 Old 03-23-10, 12:25 PM Thread Starter
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Re: 90 litre single 15" driver project.

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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post #15 of 48 Old 03-23-10, 01:29 PM
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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.

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post #16 of 48 Old 03-23-10, 08:29 PM
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Re: 90 litre single 15" driver project.

Lookin very professional Dan, did u do the spraying urself?
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post #17 of 48 Old 03-24-10, 05:51 AM Thread Starter
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Re: 90 litre single 15" driver project.

Quote:
gperkins_1973 wrote: View Post
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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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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post #18 of 48 Old 03-24-10, 05:53 AM Thread Starter
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Re: 90 litre single 15" driver project.

Quote:
gperkins_1973 wrote: View Post
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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Quote:
Mika75 wrote: View Post
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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post #19 of 48 Old 03-26-10, 01:25 PM
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Re: 90 litre single 15" driver project.

Dan,

Bose uses an 8th order BP. 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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post #20 of 48 Old 03-26-10, 03:48 PM Thread Starter
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Re: 90 litre single 15" driver project.

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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