Acoustic isolation chamber for LE5-series
Anybody have some clever solutions to isolating the LE5-series MF from the cabinet?
The JBL cabinets used a dense cardboard tube end, stuffed with batting, with the MF leads caulked through the tube wall.
There's four problems in trying to approximate this, near as I can tell:
- must acoustically isolate the MF
- must be firmly attached to the baffle
- must be minimally sized to minimize the impact on cabinet volume
- must be mounted so as to not interfere with the T-nuts.
How have you'se guys beat this? What have you used? :hmm:
A 5-inch PVC end-cap would be divine, but I haven't seem any.
Thanks!
Re: Acoustic isolation chamber for LE5-series
JBL has always specified a subenclosure volume of ~ 80 cubic inches for the LE5.
The ratio of the inside diameter of the subenclosure and it's depth is usually roughly equivalent to the "Golden" ratio:
(SQRT(5)+1)/2 or ~ 1.62 : 1 : 0.62
The inside diameter of the tube is often 5.3125"
On some models they purposely tilted the closed end of the subenclosure so it wasn't parallel with the baffle.
The 3.5 mH inductor having 7.5 ohms of DCR is set to smooth out the impedance peak of the LE5x in this sealed volume.
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Re: Acoustic isolation chamber for LE5-series
"The 3.5 mH inductor having 7.5 ohms of DCR is set to smooth out the impedance peak of the LE5x in this sealed volume."