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Hi all,I have a 3-way floor monitor I use for drummers which consists of a 1" exit horn, 8" mid driver & 15" low driver. The mid driver is sealed with internal panels around it and the horn and low driver share a vent hole. It has white polyester or fiberglass (like pillow stuffing) inside to dampen the cabinet. When I first used this, the stuffing would come out through the vent hole. So I took out the stuffing and lined the cabinet with 3/4" foam. Now after every 3-4 beats when the drummer kicks, the sound jumps or pops out.
Follow Ups:
Put the acoustic stuffing back in the loudspeakerThe foam you lined the cabinet with does absolutely nothing
Take an old nylon and stretch it and fasten it to the exit vents
on the inside of the cabinet to keep any of the stuffing coming
out of the cabinetIf you have tossed the stuffing in the trash then line
the cabinet with 2 inch thick fiberglass (the kind you put in your walls)
The pretty pink stuff that makes your hands itch like crazy when
you handle it
keep putting it in until the doubling stops! Or season to taste. I would leave the 3/4" foam, though.
If the mid range is sealed in it's own enclosure, the foam lining will have little effect, as it is mostly an absorber of stray box energy that would tame some bad sounds reflecting back out through the driver. Part of this is also dependant on how high the woofer/mid crossover frequency is too-if it is higher than 250hz, leave the foam it may help a bit with the same problems faced with the woofer.
To put fiberglass in without having it shoot out of the vent, use a staple gun, and cut out some small pieces of cardboard(the stuff used for shoe boxes, not corregated like a shipping carton), and staple through a piece, and thru the fiberglass to the inside of the cabinet. This will keep the fiberglass in position.
The bad sound you may be hearing can be from insulation material too close to the vent, so make sure it's stapled back a few inches all around from the inside opening of the vent.Best regards,
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