Foam type speaker baffles

[meowmix]

I saw at Crutchfield these foam type "Speaker Baffles".  Its not a box or a rectangular enclosure for subs, but rather a small round enclosure made of foam used for speakers to be placed on doors.  Its supposed to protect the speakers from water / dust / moisture.

Its available in various sizes i.e. 5 1/4, 6 1/2 etc. etc.

Since these "speaker baffles" are going to be a bit of a snug fit to the door speakers, will this have an adverse effect to the sound?  Will it vibrate, and create resonance when the speaker moves, since this baffle is very near the speaker?

I'm just thinking that baka "masakal" yung movement / sound of speaker with this so called baffle.  

[WenG]

nakakita ako ng ganitong install sa kabigan ko. ang ginamit ng installer ay ang manipis na rubber mat (earthpad sa camping) tapos pinorma ng cone at dinikitan ng rugby. protection daw to sa speaker from water at the same time enclosure nya para bumayo daw ang seps.

maganda naman ang result at malakas ang midbass. recommended kaya to o free air na lang?

[meowmix]

recommended kaya to o free air na lang?

Tama.  That's what I want to know too.  Isn't it that the midbass of seps where designed for free air applications?

[KeWlRyDs]

in general, midbasses that are included in component sets are designed for free-air use. adding the foam baffles will help protect the speakers from the elements but might cause a change in performance. if the 'baffle' effectively seals the midbass, low frequency output may be reduced. to be more accurate, midbass frequency extension will suffer. this would be similar to putting a subwoofer in an enclosure that's too small...the output becomes too tight.