4th order bandpass, wheel well design :) (design inside) - Page 3 - diyAudio
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Old 8th January 2008, 04:57 AM   #21
Eva is offline Eva  Spain
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... when I say that I'm tired of designing and tuning custom bandpass boxes for everybody wanting one...
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Old 8th January 2008, 05:03 AM   #22
Eva is offline Eva  Spain
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... and that I do it more for pleasure and as a challenge than for the money.

Once integrated with the front system, these enclosures provide great punch (and bass in rock music, since they reinforce anything below 120Hz) and weak to null rear presence.

Enjoy.
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Old 8th January 2008, 05:48 AM   #23
TWOJZ is offline TWOJZ  Australia
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it would see, that "maybe could you stop posting in this thread?" got lost in the translation from english to "secret"

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Old 8th January 2008, 07:20 AM   #24
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TWOJZ, we do not allow personal insults at diyAdio, so I have removed your post. Do it again and you will be visiting the sinbin.
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Old 8th January 2008, 02:38 PM   #25
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Quote:
Originally posted by ppia600
[snip]He's probably trying to hate on the large surround because some cheap companies have woofers with huge surrounds. What he's failing to mention is that the cheapo companies try to emulate designs of better companies to sell their flea market stuff. [snip]
Not necessarily. The surround is often designed as a natural extension to the cone proper, to aid in terminating the cone for minimal reflection, as well as extending the radiating area. And a higher surround-to-cone area helps control break-up.
I think you can't say that a wide surround means cheap, low quality driver, often quite the contrary.

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Old 8th January 2008, 02:43 PM   #26
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Quote:
Originally posted by Eva
In a bandpass box you are likely to get better performance with a driver designed with more common sense (I mean no donut surround, no bulky cosmetic motor not to be seen by anybody, no ultra heavy cone and voice coil, etc...)


With this approach you are likely to get 2 cavities tuned to 2 different frequencies, and as a result, very very low Q. Bends in a port also hurt efficiency badly because the moving air mass has to change direction and some energy is lost in the process.

Eva,

I think this could also lead to air flow noise. I had a similar thing and the sharp discontinuities caused air flow noise that disappeared when I put absorbing material in the angle cavities.

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Old 10th January 2008, 05:53 AM   #27
TWOJZ is offline TWOJZ  Australia
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subwoofer arrived...

subwoofer is heavy...

subwoofer is still sitting out in my car as I dont wanna try carrying it inside on my own...

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Old 13th January 2008, 06:35 AM   #28
Clipped is offline Clipped  Thailand
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wimp... lol j/k
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Old 13th January 2008, 02:56 PM   #29
ppia600 is offline ppia600  United States
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My two 7500 /mxs 1204's were heavy. Together with the small box it added up to 70lbs. Not fun to take out of the trunk. Your one sub probably weighs close to both of the ones I had.
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