Understanding Fb

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   if i want to find a 6" subwoofer that i could put in a ported box and tune low, would i look for a lower qts or a lower fs.
i was looking at the pyramid pw677x 6.5" subwoofers the qts is .72 and the fs is 55hz
winisd and help from others shows a box of 1 cu ft with a 2.5 dia port at a lenght of 3.3in tunned to 50hz and this gives me -3db at 40hz  0db at 44hz and a peak at 4db at 66hz

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schizted Members Profile Send Private Message Find Members Posts Add to Buddy List New Member Joined: 09 January 2012 Status: Offline Points: 5	Post Options Post Reply Quote schizted Report Post Thanks(0) Quote Reply Topic: Understanding Fb Posted: 19 February 2012 at 7:13am
	if i want to find a 6" subwoofer that i could put in a ported box and tune low, would i look for a lower qts or a lower fs. i was looking at the pyramid pw677x 6.5" subwoofers the qts is .72 and the fs is 55hz winisd and help from others shows a box of 1 cu ft with a 2.5 dia port at a lenght of 3.3in tunned to 50hz and this gives me -3db at 40hz 0db at 44hz and a peak at 4db at 66hz

_djk_ Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 23 November 2004 Location: United States Status: Offline Points: 3771	Post Options Post Reply Quote _djk_ Report Post Thanks(0) Quote Reply Posted: 19 February 2012 at 11:45am
	Box size is related to the square of the Qts, so the lower the Qts the smaller the box. However, the lower the Qts, the less bass you will have. To simplify things, use a driver with a Qts=0.4, make the box size equal to the Vas or the driver, and then tune the box to the Fs of the driver. Download WIN ISD. http://www.linearteam.dk/default.aspx?pageid=winisd A driver with a Qts=.72 has a very weak motor, I would find a better driver. http://gr-research.com/m130woofer-1.aspx http://www.madisoundspeakerstore.com/silver-flute-woofers-6-7/silver-flute-w17rc38-08-6-1/2-wool-cone/ Edited by _djk_ - 19 February 2012 at 12:04pm
	djk