subs

i have a pair of sony xsl 1236 900 watt sony xplod speakers the thing is i brought  them with a sealed box with no air holes the thing is that wheni play my music i get more of a thud then a boom wot will happen if i put 2 ports just at the back of the speakers would i get a better sound please helpm.moss

Depends on the design of the box (1 chamber or 2, and overall size), the size of the ports, and the specs of the subs. Most sealed enclosures are smaller that ported ones. You would have to check the subs specs for minimum size recomendations of sealed and ported enclosures. Also remember that addeding ports will only give you tighter response at certain frequencies (depends on the port size (diameter and length)). You could try adding pollyfil inside the enclosure and see how that works as well.Squirrel

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From my personal experience of building over 100 enclosures, if the sealed box sounds that incredibly bad, it almost HAS to be the incorrect air space for the subs. Sealed boxes are very forgiving when it comes to airspace, meaning that in most cases its not much of a problem as long as the air space is around the ballpark figure of the recommended air space. However, as I stated, if it sounds that bad, the box probably has the wrong air space. From my experience with Sony subwoofers, I would give the 12's around 1.5 cubic feet of air space per woofer. Check the airspace of your enclosure, and post it.

the sub is supposed to have 1.0 cf of air space