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Goldwood  GW-215/4 OB sub-woofer?
Goldwood  GW-215/4 OB sub-woofer?
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Old 21st November 2019, 09:38 AM   #1
Giri is offline Giri
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Default Goldwood GW-215/4 OB sub-woofer?

I simulated a four Goldwood GW-215/4 with four 15" driver per side, in a series-parallel configuration, in Basta. I have attached are the pictures of the simulation.

1) Is the xmax of 3.5mm a matter of concern? What is the xlim of Goldwood GW-215/4?

2) Please let know any observations or comments on the design, its feasibility, improvements etc.
Attached Images
File Type: jpg 2019-11-21 13_55_21-Window.jpg (99.3 KB, 90 views)
File Type: jpg 2019-11-21 14_00_41-Window.jpg (57.3 KB, 89 views)
File Type: jpg 2019-11-21 14_02_15-Window.jpg (134.2 KB, 91 views)

Last edited by Giri; 21st November 2019 at 09:40 AM. Reason: Edited for clarity
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Old 21st November 2019, 12:31 PM   #2
chris661 is offline chris661  United Kingdom
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How loud do you want to go?
OB bass is very lossy, but does have some advantages with regards to room interaction.

I wouldn't worry about Xmax so much as how gracefully the driver approaches and exceeds Xmax.

Chris
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Old 21st November 2019, 02:02 PM   #3
scottjoplin is offline scottjoplin  Wales
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Quote:
Originally Posted by chris661 View Post
OB bass is very lossy, but does have some advantages with regards to room interaction.
Yes, slightly less big box interaction, much less small box interaction
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Old 22nd November 2019, 02:33 AM   #4
Giri is offline Giri
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Quote:
Originally Posted by chris661 View Post
How loud do you want to go?
OB bass is very lossy, but does have some advantages with regards to room interaction.

I wouldn't worry about Xmax so much as how gracefully the driver approaches and exceeds Xmax.

Chris
I am worried about damaging the driver at volumes that cross the xlim more than any distortion
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Old 22nd November 2019, 06:34 AM   #5
Giri is offline Giri
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Quote:
Originally Posted by scottjoplin View Post
Yes, slightly less big box interaction, much less small box interaction
More like zero small box interaction
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Old 22nd November 2019, 08:36 AM   #6
chris661 is offline chris661  United Kingdom
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Quote:
Originally Posted by Giri View Post
I am worried about damaging the driver at volumes that cross the xlim more than any distortion
Fair enough. That does come back to my question, though - how loud do you want to go?

You might find it's impossible to hit Xlim - it's rare to find a driver that will actually let you bottom it out as most tend to run out of motor force towards the ends of excursions, plus the surround/suspension is starting to lock up. The result is that the cone simply won't go any further, no matter how much power you drop in.

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Old 22nd November 2019, 11:22 AM   #7
Giri is offline Giri
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Quote:
Originally Posted by chris661 View Post
Fair enough. That does come back to my question, though - how loud do you want to go?

You might find it's impossible to hit Xlim - it's rare to find a driver that will actually let you bottom it out as most tend to run out of motor force towards the ends of excursions, plus the surround/suspension is starting to lock up. The result is that the cone simply won't go any further, no matter how much power you drop in.

Chris
I have seen internet pictures of some cones broken due to cone exertion beyond limits. Hence, the concern.
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Old 22nd November 2019, 02:17 PM   #8
chris661 is offline chris661  United Kingdom
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That's almost certainly down to PA usage. In a HiFi situation, if it sounds bad you'll turn it down. In a PA situation, you want every last bit of output and treat the speakers accordingly.

Chris
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Old 22nd November 2019, 02:24 PM   #9
scottjoplin is offline scottjoplin  Wales
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You could lower the excursion requirements by using an H or U frame
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Old 22nd November 2019, 03:10 PM   #10
Giri is offline Giri
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Originally Posted by scottjoplin View Post
You could lower the excursion requirements by using an H or U frame
I'm considering a H-frame or a V-Frame
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