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<blockquote data-quote="DidUHearThat?" data-source="post: 4717590" data-attributes="member: 594758">As he said, they work off the air pressure developed inside the cabinet to produce more sound.&nbsp; The sound pressure alone moves the cone back and forth and this produces sound.They can add more low end to the powered speaker/sub, but they also effect the impedence of the powered speaker because it acts as another suspension.&nbsp; That energy isn&#039;t free and it puts more effort on the main driver and amp.&nbsp; It also isn&#039;t a huge gain in low end.Usually this is done with small drivers and small boxes, like 4&quot; drivers to give them a little more bass.&nbsp; It&#039;s usually not worth the cost and hassle.&nbsp; Back in the day when high power drivers and amplifier watts were expensive and labor was cheap this was more common.&nbsp; Now high power drivers and amps are cheap but the labor to install&nbsp; and build them is not, making them less practical.For the hassle of calculating the effect and extra cost you can just get a higher power driver or add a second regular driver.</blockquote>

[QUOTE="DidUHearThat?, post: 4717590, member: 594758"] As he said, they work off the air pressure developed inside the cabinet to produce more sound. The sound pressure alone moves the cone back and forth and this produces sound. They can add more low end to the powered speaker/sub, but they also effect the impedence of the powered speaker because it acts as another suspension. That energy isn't free and it puts more effort on the main driver and amp. It also isn't a huge gain in low end. Usually this is done with small drivers and small boxes, like 4" drivers to give them a little more bass. It's usually not worth the cost and hassle. Back in the day when high power drivers and amplifier watts were expensive and labor was cheap this was more common. Now high power drivers and amps are cheap but the labor to install and build them is not, making them less practical. For the hassle of calculating the effect and extra cost you can just get a higher power driver or add a second regular driver. [/QUOTE]

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