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<blockquote data-quote="John_E_Janowitz" data-source="post: 6209873" data-attributes="member: 550657">I think it&#039;s important to again emphasize the difference between thermal power handling and the amount of power it will take to get to the physical limits of the driver.&nbsp; Thermally the AV series 2.5&quot; coil can take a large amount of power.&nbsp; When we hooked one up to the wall socket that gives about 4800W to the driver and the already damaged woofer still went for about 30sec with that kind of continuous power.&nbsp; Thermally 1200W or so as stated above is no issue for the AV woofers.Mechanically it is a much different story.&nbsp; A modeling program can give you a fairly good indication of how much excursion you have in a given box with a given amount of power at each frequency.&nbsp; In a vented box it is especially important to have a subsonic filter to protect the driver from over excursion below tuning.&nbsp; Below the tuning frequency the port unloads and you are easily able to push the driver to high excursions.&nbsp; You are also doing so at frequencies that will be below the limits of audibility due to the rolloff.&nbsp; There really is no point to attempt to play these frequencies.&nbsp; A highpass filter (subsonic, infrasonic are the common names) protects the driver from over excursion and also gives back some headroom as the amplifier is not producing power for frequencies the woofer can&#039;t even play.The ideal situation is to setup the system so that both the thermal and physical limits are reached approximately at the same time.&nbsp; That way neither of these factors are greatly limiting the output.The 3&quot; coil driver will be able to handle more power than the 2.5&quot; coil thermally.&nbsp; It will also have more mass and more motor strength.&nbsp; As a result it will be more efficient than the 2.5&quot; coil requiring less power for a given SPL while being able to take more power overall as well.&nbsp;&nbsp; The same things will apply in terms of mechanical limitations of the driver though as they apply to every/all drivers made.John</blockquote>

[QUOTE="John_E_Janowitz, post: 6209873, member: 550657"] I think it's important to again emphasize the difference between thermal power handling and the amount of power it will take to get to the physical limits of the driver. Thermally the AV series 2.5" coil can take a large amount of power. When we hooked one up to the wall socket that gives about 4800W to the driver and the already damaged woofer still went for about 30sec with that kind of continuous power. Thermally 1200W or so as stated above is no issue for the AV woofers. Mechanically it is a much different story. A modeling program can give you a fairly good indication of how much excursion you have in a given box with a given amount of power at each frequency. In a vented box it is especially important to have a subsonic filter to protect the driver from over excursion below tuning. Below the tuning frequency the port unloads and you are easily able to push the driver to high excursions. You are also doing so at frequencies that will be below the limits of audibility due to the rolloff. There really is no point to attempt to play these frequencies. A highpass filter (subsonic, infrasonic are the common names) protects the driver from over excursion and also gives back some headroom as the amplifier is not producing power for frequencies the woofer can't even play. The ideal situation is to setup the system so that both the thermal and physical limits are reached approximately at the same time. That way neither of these factors are greatly limiting the output. The 3" coil driver will be able to handle more power than the 2.5" coil thermally. It will also have more mass and more motor strength. As a result it will be more efficient than the 2.5" coil requiring less power for a given SPL while being able to take more power overall as well. The same things will apply in terms of mechanical limitations of the driver though as they apply to every/all drivers made. John [/QUOTE]

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