Reply to thread

Message

<blockquote data-quote="vasyachkin" data-source="post: 56983" data-attributes="member: 544250">sealed box is a second order system meaning it has 2 * 6 = 12 decibels per octave bass rolloff&nbsp; below &quot;corner frequency.&quot;ported box is a fourth order system meaning it has 4 * 6 = 24 decibels per octave rolloff below corner frequency.corner frequency is the resonance frequency by the way.a cabin with windows closed is also a sealed box in itself and has a 12 decibels per octave BOOST below a certain frequency determined mostly by the largest dimension of the cabin.&nbsp; approximately where the largest dimension of cabin is half the wavelenght of a certain frequency - that frequency is the corner frequency for cabin&#039;s boost.&nbsp; by matching the corner frequency of a sealed box to that of the cabin you can cancel the box&#039;s bass loss with cabin&#039;s bass gain and achieve near-flat response to almost zero hetz.&nbsp; on the other hand you can NOT do that with ported box because 24db per octave does not equal 12db per octave.</blockquote>

[QUOTE="vasyachkin, post: 56983, member: 544250"] sealed box is a second order system meaning it has 2 * 6 = 12 decibels per octave bass rolloff below "corner frequency." ported box is a fourth order system meaning it has 4 * 6 = 24 decibels per octave rolloff below corner frequency. corner frequency is the resonance frequency by the way. a cabin with windows closed is also a sealed box in itself and has a 12 decibels per octave BOOST below a certain frequency determined mostly by the largest dimension of the cabin. approximately where the largest dimension of cabin is half the wavelenght of a certain frequency - that frequency is the corner frequency for cabin's boost. by matching the corner frequency of a sealed box to that of the cabin you can cancel the box's bass loss with cabin's bass gain and achieve near-flat response to almost zero hetz. on the other hand you can NOT do that with ported box because 24db per octave does not equal 12db per octave. [/QUOTE]

Verification