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In Reply to: RE: speaker response in a cabinet half the recommendation posted by tubeflash on September 14, 2014 at 22:15:14
A smaller sealed cabinet will raise the Qtc of the system, resulting -- as Hornlover noted -- in a higher F3 and probably a response hump just above rolloff. Unless it's WAY too small, you can still get acceptable response, since the different Qtcs are points along a continuum. It's difficult to badly screw up a sealed alignment: if the optimum cabinet volume is calculated for Qtc = 0.7, then halving that volume will yield a Qtc of approximately 1, while doubling it would yield about Qtc = 0.5.
The effect of an undersized cabinet can be mitigated somewhat by increasing the amount of fiberfill stuffing in the cabinet, and additionally by adding an aperiodic vent such as sold by ScanSpeak.
If you're trying for a vented alignment in too small a box, you may need to radically recalculate port dimensions, and even then there's no guarantee of acceptable performance. You may be SOL.
Follow Ups:
yes this is a sealed system. is there any way you can approximate for me the new higher f3 frequency. recommended volume for the new woofer
4.0 cuft. actual box volume 2.6 cuft thanks
...you will need several of the Theie-Small parameters for your driver to do the calcs.
There are box calculator programs available. But taking a sealed box and switching drivers to a vented box will bring about a number of changes.
Most importantly is the roll off of the driver. And second, and this CAN be a big issue, is the prominence of the midrange sound of that driver. Then sensitivity and it's effects on other drivers in the box, eg passive radiator effect.
Try posting over at the Parts Express Tech Talk forums. A lot of those guys are really into DIYing drivers.
I used to, but found out it was an expensive hobby. And didn't work out 99% of the time. Now I stick to kits. Let someone with more knowledge and equipment work out the kinks.
charles
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