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Old 2nd March 2012, 04:13 PM   #11
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I'll post my plan tonning! they're done so..
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Old 2nd March 2012, 04:14 PM   #12
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Quote:
Originally Posted by sreten View Post
Hi,

Because it does appear to be very misguided. As a "plan"
it really doesn't have anything going for it that I can see.
The OP has already stated he'll dismantle so that the boxes can be put back to original condition, so I fail to see any drawbacks. Of course it may not work as expected, but the build will be good fun and he may well learn lots of things by doing. Not everyone learns well from textbooks, some get more from a hands on approach.
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Old 3rd March 2012, 12:34 PM   #13
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by yoannblain View Post
it's not a box at all, and why should newer drivers be better
than the ones on my celestions? and I'm not sure I will be
able to find some as good in my budjet..
Hi,

I know its not a box, its a complex build described as 5ft tall 3ft deep
and nearly 2ft wide, in other words a shedload of work for little purpose.

You won't significantly change the quality of the sound, probably make
it worse by adding a second bass driver and messing up the bass setup.

By all means build it if you want to treat it as a "learning" process,
but IMO its the learning process for the stubborn and fanciful.

I'm not being cynical, just an engineer. Being that requires a good
understanding of the prospect and likely outcome of any project.

I'm all for intelligent modifications, but to be able to say
that, I have to to be able to say that is not a good idea.

There is nothing in this thread that explains why it is a good
idea, what it does, what it fixes, why it makes it any better.

Adding another 12" is just plain stupid, as is stating "active
of course" as though this fixes anything, it doesn't at all.

Regarding modern and far older drivers that is your learning curve.

rgds, sreten.

The 662's are desirable classic loudspeakers and the drivers
go for serious prices, they are not budget butchering fodder.
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Last edited by sreten; 3rd March 2012 at 12:52 PM.
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Old 3rd March 2012, 04:29 PM   #14
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I understand what you mean, thank you for elping me, I realy want to try this project so should I stay with the active + passive woofer?
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Old 3rd March 2012, 04:34 PM   #15
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that's the way I will build them, but with a different design Portal MundoHi-Fi :: Alta Fidelidad
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Old 3rd March 2012, 04:35 PM   #16
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The passive radiator acts like the port of a bass reflex tuned cabinet .
The nautilus design is a closed cabinet ,much more like a transmission line , where the sound finds a dead end .
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Old 3rd March 2012, 05:53 PM   #17
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here's a few draws! www.photobucket.com/spiralspeakers
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Old 4th March 2012, 09:03 PM   #18
sreten is offline sreten  United Kingdom
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Hi,

It simply won't work well, for basic acoustic engineering reasons.

If you understand "artifice" thats what you seem to want to do.
It might look like a B&W Nautilus but that will be simply as far
as it goes as none of your drivers are suitable for purpose.

It will sound worse than the base speakers you started with.

rgds, sreten.
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Old 4th March 2012, 09:09 PM   #19
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Yes , if it's only for trying the shape , you could (may or...ought to ,possibly ) start
with a two way,making it littler , with ,say , a 7-8" and a tweeter .
It would result in a cleaner design , slim , and probably sounding better .
maybe a kit , as it facilitates everything having the crossover already made .

Last edited by picowallspeaker; 4th March 2012 at 09:11 PM.
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Old 4th March 2012, 09:28 PM   #20
mdocod is offline mdocod  United States
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I think that what Sreten was trying to tell you, in a more condensed and/or direct form is something like as follows:

The possible advantages of a very elaborate and complicated box design (like the B&W shell), are normally utilized for the very FINE tuning and reduction of a systems distortion characteristics. You seem to be approaching the project with the idea in mind that this "box design" makes up a major part of possible distortion issues. It does not. It's just a spoke in a very complex wheel. Moving that spoke over to your wheel does not keep your wheel round.
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