How to design an enclosure to maximise lower frequencies?
Ok basically i have a pair of 6X9 speakers and i bought an enclosure for them off ebay, about .31 cubic feet in size. Now, although their response is largely increased, the lower frequencies are not that good. How do you go about designing an enclosure to get better bass? I'm currently studying a bit of this at university, so i know about ported and sealed and a port is used to get a better bass response. I know there are other enclosure types like bandpass or passive radiator, but i assumed ported was the best? What i'm looking for is one that can really hit the low frequenices well. This is why i went with ported, because theres lots of stuff out there that helps you with tuning the ports to 'resonate?' at specific frequency.
However what really confuses me is that i have 2 shelf speakers, edirol MA-15D, and they are about half the size yet their response is soo much better. Why is this? is it to do with the size of the enclosure in relation to the cone/driver? And also with the material used to build the speaker? and baffle inside the speaker to absorb the rear soundwaves?
The speakers i am trying to build an enclosure for are Infinity 9613i
In short, what do you need to do to get an enclosure that significantly boost low frequencies?