I used to think the vent should be as far from the driver as possible, but now I'm wondering if it should be as close as possible; if it's far away, the air in-between could act like a spring, and reduce the damping effect - dampers on racing cars are rigidly mounted, because they work better that way.
But this is just an idea, I have NO measurements to back this up.
I like to put vents on the bottom, so they can vent into a hollow stand. If the stand is not used, feet on the speaker can raise it enough for the vents to still work.
Have you tried using a 1 or 2 ohm resistor in series with the driver? - this will reduce the damping factor, making it easier to hear effects of the vent, but an impedance sweep would be much better.
But this is just an idea, I have NO measurements to back this up.
I like to put vents on the bottom, so they can vent into a hollow stand. If the stand is not used, feet on the speaker can raise it enough for the vents to still work.
Have you tried using a 1 or 2 ohm resistor in series with the driver? - this will reduce the damping factor, making it easier to hear effects of the vent, but an impedance sweep would be much better.
Now use aperiodic port (circular) in front and sound amazing, but would like to try in back also. Also interesting is it difference in sound using one big open hole or more small holes with same surface as one hole?
Dave
"On the back as far from the driver as possible"
Why you use on bellow picture (midTL) in front?
Dave
"On the back as far from the driver as possible"
Why you use on bellow picture (midTL) in front?
That looks like one of mine. It is an aperiodic midTL. It needs to be fully full of phluff, denser towards the terminus.
One of my gurus did some of the most advanced research to date on aperiodic boxes and i have found his methodology works. The TL gives even more damping for the rear wave to pass thru and get converted to heat.
dave
One of my gurus did some of the most advanced research to date on aperiodic boxes and i have found his methodology works. The TL gives even more damping for the rear wave to pass thru and get converted to heat.
dave
