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ported vs sealed enclosures


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spike131113 
Member - Posts: 31
Member spacespace
Joined: November 09, 2008
Location: Michigan, United States
Posted: November 09, 2008 at 8:13 PM / IP Logged  
What are the specifications for each box (sound quality/loudness) , what is the better one for making subs knock, pros and cons to the box?
Brandon Pieniozek
haemphyst 
Platinum - Posts: 5,053
Platinum spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: January 19, 2003
Location: Michigan, Bouvet Island
Posted: November 10, 2008 at 9:22 AM / IP Logged  
I don't know what you mean by "specifications" (or "knock", for that matter... Do you mean "pound", or "slam"?). A properly tuned and constructed vented enclosure CAN be a fantastic sounding alignment, at the (again - in a PROPER enclosure) potential expense of extension or transient response, but at the DEFINITE expense of volume; it'll be larger, oftentimes FAR larger. Generally speaking, most people consider a sealed enclosure first for "Sound Quality" applications, and a vented enclosure for "output", however, this is not necessarily the end-all-be-all rule-of-thumb. Both can be used for either application, and both will depend pretty completely on the specifications of the driver itself. Not all drivers can be used in just any alignment.
Sealed enclosures are far more forgiving of volume tolerances. It can be a bit bigger or smaller than the "design" calls for, with little to no detrimental effect on the final product. Vented enclosures must be very tighly controlled as to their final volumes, as a slight error either way in volume (as little as 5%) will have MAJOR, and potentially catastrophic results.
One major disadvantage to a vented enclosure is that below the tuning frequency, the woofer will "unload", providing an opportunity for the woofer diaphragm to damage itself or other parts of the motor structure - most often the spider or the voicecoil. Because of this tendency, I always recommend a subsonic filter with their use.
And just a heads-up, but a REALLY basic question like this, and "Supreme Audio" in your signature will probably open you up to a whole MESS of razzing. Either basic questions or "Supreme", but you can't have both.
It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
absolutepower 
Copper - Posts: 98
Copper spacespace
Joined: November 28, 2007
Location: California, United States
Posted: November 10, 2008 at 1:30 PM / IP Logged  
with a vented ported box, if u choose that route make sure the amp u are useing is equipped with a subsonic/infrasonice filter. this will keep ur subs from hittin fqs below 25hz and unloading as was said by haemphyst.
SKratch 
Member - Posts: 12
Member spacespace
Joined: November 05, 2004
Location: United States
Posted: November 12, 2008 at 1:15 PM / IP Logged  
Perfect reply above...

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