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Old 18th January 2013, 03:35 PM   #61
Juhazi is offline Juhazi  Finland
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tb46,
separating the subs would also loosing a nice 220cm wide bench! You can see some of the bench in the photo at post #39 and in a 3D picture at post #32

I really hope that drivers would come soon.. The weather has been too cold for skiing and snowmobile riding (today -29C in the morning) Blaah, some more sketching, modelling, simulating, ..and perhaps som more wine?
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Last edited by Juhazi; 18th January 2013 at 03:46 PM.
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Old 18th January 2013, 04:33 PM   #62
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Jahuzi, here in west Belgium we had two mornings of -14°C, pretty rare.
But seeing -29°C is unimaginable

I think tb46 meant to say: change one baffle from the PPSL to the far end of the enclosure.
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Old 18th January 2013, 05:04 PM   #63
tb46 is offline tb46  United States
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Hi Jahuzi,

Keep the bench, just move one driver to the left hand end of the bench.

Regards,
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Old 18th January 2013, 08:15 PM   #64
Juhazi is offline Juhazi  Finland
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Ok, I mentioned turning boxes in message #49. It is easy but first I want to hear the ppsl. Check also version 2 in message #1
According to hunecke simulator, moving speakers sideways along the short wall doesn't change 40Hz hump at all. Listening while laying on the floor helps! Fortunately I have 2 extra small subs.

Too many iterations so far I guess
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Last edited by Juhazi; 18th January 2013 at 08:40 PM.
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Old 28th January 2013, 07:59 PM   #65
Juhazi is offline Juhazi  Finland
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So far still waiting for drivers...

I learned how to bake a baffle in Hornresp. Here is what to expect in 1pi conditions at maximum excursion

spl
phase
wavefront simulation
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Old 30th January 2013, 02:36 AM   #66
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do you have a 1pi ?

That is a corner right ?

Ideally that is a concrete corner. otherwise, I wouldn't trust the simulation, let alone all the variation of bass in a room............

Why is there the phase wrap around 48hz ???????
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Old 30th January 2013, 08:55 PM   #67
Juhazi is offline Juhazi  Finland
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I'm not sure of the phase shift but I guess it is the plemun - depth, width, height? I mus try to change parameters and see what happens.

Pi environment definitions Radiation Space in a Room
Attached Images
File Type: png pi definitions.png (42.6 KB, 139 views)
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Old 31st January 2013, 09:10 AM   #68
dctech is offline dctech  Canada
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Love the dual function bench/sub.
Sorry to butt in....
Don't use MDF, go with 3/4 baltic birch or 3/4 marine grade plywood (11-13 ply).
If you want smooth, fast response be aware of your amps damping factor as that dictates how well it can stop and start the moving mass of the driver.
A properly constructed, sealed enclosure, will always yield best balance of spl and sq.
Especially for home theater.
With a ported enclosure, when you send signal to the driver below the tuned frequency, the driver no longer sees the box and it will over-excurd.

If your subs are 15's, what is the next largest woofer in your system?
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Old 31st January 2013, 09:29 AM   #69
Juhazi is offline Juhazi  Finland
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dctech,
The cabs were made of 21mm spruce plywood and they are closed, the drivers are optimal for closed cabs. The slot cavity has some resonance properties.

Hypex DS2.0 has damping factor 500 - enough?

My other subs are 10" and 8" BR, F6 around 35Hz, commercial subs with plate-amps.


So far I'm still waiting for the drivers....
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Old 31st January 2013, 08:10 PM   #70
zobsky is offline zobsky  India
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Quote:
Originally Posted by Juhazi View Post
adason, I'm just trying to tell that I want good transient and "controlled" subbass. English is not my native language and I'm trying to avoid tautology.
You're ignoring the possibility of room modes.
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