While it is still not clear whether Rms as a whole is important for precise bass sound (http://www.diyaudio.com/forums/showthread.php?s=&postid=60555), I have found a couple of references on the subject of unfavorable air flow conditions. A modern woofer will have any or all of the following features to improve venting and hence lower turbulence and air compression:
a) phase plug
b) magnet venting holes
c) venting holes in the semi-sealed volume between the centring diaphraghm (is this the correct word?) and the cage
I wonder if it is possible to implement this on vintage drivers that are still very good except for venting.
b) will probably destroy the speaker
a) should be doable. One would have to cut a big circular hole in the dustcap and then stick some sort of metal column through the hole and glue it to the magnet
c) should also be possible if the cage is dye cast aluminum. Maybe one must use low rpms or even a hand drill. Or would a router be preferable?
Anybody tried this?
Eric
a) phase plug
b) magnet venting holes
c) venting holes in the semi-sealed volume between the centring diaphraghm (is this the correct word?) and the cage
I wonder if it is possible to implement this on vintage drivers that are still very good except for venting.
b) will probably destroy the speaker
a) should be doable. One would have to cut a big circular hole in the dustcap and then stick some sort of metal column through the hole and glue it to the magnet
c) should also be possible if the cage is dye cast aluminum. Maybe one must use low rpms or even a hand drill. Or would a router be preferable?
Anybody tried this?
Eric