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<blockquote data-quote="audioholic" data-source="post: 5988392" data-attributes="member: 549629">When a vented enclosure &#039;unloads&#039;, that is due to the signal material deviating too far below tuning. With such a high tuning, this is very possible with music, but when playing a single tone at or near (slightly) tuning, like you said you were, this isn&#039;t going to happen.Too large of an enclosure, and/or too much port area can cause too little acoutsic dampening for a given power level. Basically speaking, the larger the enclosure, or port area, the quicker the sub can reach its xmax, much like a sealed enclosure system. Vented systems work similar, but signal frequency also affects back pressure on the cone due to port tuning. But in general, yes a larger vented enclosure allows for more cone travel, and decreases power handling of the system.But, if its merely an example of too large an enclosure, the cone excursion should increase at a linear rate. A small jump in input power should not increase cone excursion a larger amount than did the same power increase at a lower excursion level. But, if the sub is &#039;unloading&#039; due to the signal varying below tuning, excursion does increase drastically at a rapid rate, once the signal deviates below tuning. But as I said earlier, if you are playing a single tone, this should not happen. Even if the tone is below tuning, excursion will increase faster than normal, but it wont hit a &#039;plateau&#039; where all the sudden excursion increases at a more rapid rate.My guess, without really knowing much/enough about the situation, is you are clipping your amp. Im being too lazy to check specs or do any math tho, just saying that&#039;s what the symptom you describe sounds like to me.Cheers, and good luck.</blockquote>

[QUOTE="audioholic, post: 5988392, member: 549629"] When a vented enclosure 'unloads', that is due to the signal material deviating too far below tuning. With such a high tuning, this is very possible with music, but when playing a single tone at or near (slightly) tuning, like you said you were, this isn't going to happen. Too large of an enclosure, and/or too much port area can cause too little acoutsic dampening for a given power level. Basically speaking, the larger the enclosure, or port area, the quicker the sub can reach its xmax, much like a sealed enclosure system. Vented systems work similar, but signal frequency also affects back pressure on the cone due to port tuning. But in general, yes a larger vented enclosure allows for more cone travel, and decreases power handling of the system. But, if its merely an example of too large an enclosure, the cone excursion should increase at a linear rate. A small jump in input power should not increase cone excursion a larger amount than did the same power increase at a lower excursion level. But, if the sub is 'unloading' due to the signal varying below tuning, excursion does increase drastically at a rapid rate, once the signal deviates below tuning. But as I said earlier, if you are playing a single tone, this should not happen. Even if the tone is below tuning, excursion will increase faster than normal, but it wont hit a 'plateau' where all the sudden excursion increases at a more rapid rate. My guess, without really knowing much/enough about the situation, is you are clipping your amp. Im being too lazy to check specs or do any math tho, just saying that's what the symptom you describe sounds like to me. Cheers, and good luck. [/QUOTE]

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