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alpine swr1242d


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raven2122 
Member - Posts: 3
Member spacespace
Joined: May 25, 2005
Location: Canada
Posted: January 01, 2007 at 5:09 PM / IP Logged  

I was reading in the info that came with my sub that the recommended enclosers are sealed, ported and bandpass.  It gives the ideal volum for the sealed and ported box's but not bandpass.

How much room do I need?

nmd
actypes 
Member - Posts: 17
Member spacespace
Joined: March 13, 2005
Posted: January 01, 2007 at 6:40 PM / IP Logged  
i wouldnt recommend using a bandpass enclosure.  The SQ from it is going to be very poor.  Ideally an alpine type r will sound its best in a sealed or ported enclosure..  It all depends on whether or not you want loud boomy bass, or nice tight bass
stevdart 
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Platinum spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spaceThis member consistently provides reliable informationspace
Joined: January 24, 2004
Location: Pennsylvania, United States
Posted: January 01, 2007 at 8:15 PM / IP Logged  
I recommend a vented box for that sub, built a bit larger than the manual indicates.  Instead of net internal volume at 1.3, make it 1.8 cu ft.  Port, slotted, with 14 sq in of opening area and no less than 1.5" wide (2 X 7 is good).  Usually these slot ports are built the length of the internal box height, but the 1.25" the manual indicates is too narrow, IMO.  (I also dropped the port sq in opening down from the indicated 15" to 14 sq in.)  Port length 21 3/4".  Of course, the port structure takes up airspace so you have to calculate how much it is going to displace.  Tuning freq and F3 is at 29 Hz.
Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
aznboi3644 
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Gold spaceThis member consistently provides reliable informationspace
Joined: May 01, 2006
Location: United States
Posted: January 02, 2007 at 7:59 PM / IP Logged  
actypes wrote:
i wouldnt recommend using a bandpass enclosure. The SQ from it is going to be very poor. Ideally an alpine type r will sound its best in a sealed or ported enclosure.. It all depends on whether or not you want loud boomy bass, or nice tight bass
You are probably thinking prefab bandpass boxes...if that is the case than yes sound quality will be crap and the bass will be boomy and sound like crap.
But a properly designed and built bandpass enclosure can have excellent sound quality and a flat response...I think you are misunderstanding the bandpass box.

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