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can a 12" hwk be used in a mini van? (Read 5608 times)
60ndown
Ex Member



Re: can a 12" hwk be used in a mini van?
Reply #15 - 06/14/06 at 02:29:30
 
[quote author=John in CR  link=1150156228/0#14 date=1150245885]You'll need a steep high pass rumble filter probably in the 30-35hz range if you want to pump significant power into it. [/quote]
your sujjesting hwk offers no controll over the driver below 30hz?
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John in CR
Ex Member



Re: can a 12" hwk be used in a mini van?
Reply #16 - 06/14/06 at 02:39:54
 
[quote author=60ndown  link=1150156228/15#15 date=1150248570]
your sujjesting hwk offers no controll over the driver below 30hz?
[/quote]

That's the nature of vented enclosures.  Below tuning the drivers unload.  At least with the WO, you've got the sealed chamber side helping control the cone, but again, there's no way you could apply full power and a 30hz signal even with the WO.
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60ndown
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Re: can a 12" hwk be used in a mini van?
Reply #17 - 06/14/06 at 05:44:25
 
[quote author=John in CR  link=1150156228/15#16 date=1150249194]

That's the nature of vented enclosures.  Below tuning the drivers unload.  At least with the WO, you've got the sealed chamber side helping control the cone, but again, there's no way you could apply full power and a 30hz signal even with the WO.
[/quote]

but the hwk is 'kindof' sealed with a driver in each end of the middle chamber? or something linke that Roll Eyes
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Lee in Arkansas
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Re: can a 12" hwk be used in a mini van?
Reply #18 - 06/14/06 at 05:46:59
 
Isn't the HWK just as BandPass as the WO?
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John in CR
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Re: can a 12" hwk be used in a mini van?
Reply #19 - 06/14/06 at 21:03:55
 
The HWK is a 6th order bandpass and not like the WO at all where the back chambers are sealed.  In the HWK, the center chamber is sealed, but it's a shared airspace with no change in pressure because it only provides an isobarik coupling of the two drivers.
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Lee in Arkansas
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Re: can a 12" hwk be used in a mini van?
Reply #20 - 06/14/06 at 21:08:21
 
Isn't it still harder to unload it?
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John in CR
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Re: can a 12" hwk be used in a mini van?
Reply #21 - 06/15/06 at 00:09:07
 
[quote author=Lee in Arkansas  link=1150156228/15#20 date=1150315701]Isn't it still harder to unload it? [/quote]

Probably only compared to having only 1 driver in a 6th order bandpass due to the decreased Vas.  I have noticed that my quad loaded HWK's can go louder than with 2 drivers without banging the back plate despite the inherent higher tuning.
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60ndown
Ex Member



Re: can a 12" hwk be used in a mini van?
Reply #22 - 06/15/06 at 01:09:23
 
[quote author=John in CR  link=1150156228/15#19 date=1150315435]it's a shared airspace with no change in pressure [/quote]

unless you wire them out of phase?
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J_Rock
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Re: can a 12" hwk be used in a mini van?
Reply #23 - 06/15/06 at 01:56:57
 
If you were to wire the drivers so that they fire the opposite ways, the movement would be dampened as well as those same two drivers in as single sealed chamber the size of the middle chamber.  In other words, you would gain control over the drivers, yet loose output from overdampening them.
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John in CR
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Re: can a 12" hwk be used in a mini van?
Reply #24 - 06/15/06 at 04:37:54
 
[quote author=60ndown  link=1150156228/15#22 date=1150330163]

unless you wire them out of phase?
[/quote]

Tried it.  Sound sucked.  It's not even the same as sealed 1/2 size center chambers for each driver because the 2 drivers are each seeing a differently tuned vented chambers on the other sides of their cone, so they move differently.
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« Last Edit: 06/15/06 at 04:38:52 by John in CR »  
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60ndown
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Re: can a 12" hwk be used in a mini van?
Reply #25 - 06/16/06 at 00:50:10
 
[quote author=John in CR  link=1150156228/15#24 date=1150342674]

Tried it.  Sound sucked.  It's not even the same as sealed 1/2 size center chambers for each driver because the 2 drivers are each seeing a differently tuned vented chambers on the other sides of their cone, so they move differently. [/quote]

but all the rules change in c vehicle no?
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John in CR
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Re: can a 12" hwk be used in a mini van?
Reply #26 - 06/16/06 at 04:52:51
 
[quote author=60ndown  link=1150156228/15#25 date=1150415410]

but all the rules change in c vehicle no? [/quote]

No, the same rules apply, just a much smaller room.  If you're outside of the car and a window is open then you'll get some box within a box behavior.
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