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On the outside of the enclosure, we can even hear the enclosure's "note" along with the speaker's note in severe cases. For this reason, enclosures and speaker baffles are often built extremely solid. Some guys even go to double-layers of MDF with dynamat sandwiched between them. Others have even used sand and/or concrete to fill the space between the layers of double-walled enclosures for added resistance to resonation. Sometimes, thicker and stiffer enclosure walls can STILL resonate, so great care should be taken to use some sort of damping material inside the enclosures used in a high-end system. We can't get into all of these materials here, but these materials MUST be in direct contact with the inner surfaces of said enclosures. Sprays are the easiest to use, but self-adhesive damping materials work well too. If enough damping material is applied, virtually all unwanted resonations can be conquered inside an enclosure. Personally, I like to use non-hardening clay to deaden enclosures, as it sticks in direct contact with said enclosure and is easily pliable while offering excellent damping characteristics.
Quotes from one of the tutorials posted by audionutz on ECA.
http://www.diymobileaudio.com/forum...6-does-anyone-dampen-their-sub-enclosure.html
Σαν να μιλάει για μας εδώ ο φίλος, που ακούγαμε τη "νότα" της καμπίνας μαζί με τη νότα του μπάσου της μουσικής. Γι' αυτό τον λόγο λέει πολλοί χρησιμοποιούν διπλές στρώσεις MDF με dynamat σε μορφή σάντουιτς μεταξύ τους. Άλλοι φτάνουν στο σημείο να χρησιμοποιούν άμμο και/ή τσιμέντο για να γεμίσουν το κενό μεταξύ των στρωμάτων που έχουν οι καμπίνες με διπλά τοιχώματα.
Για μας χτυπά η καμπάνα!