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<blockquote data-quote="Buck" data-source="post: 8763672" data-attributes="member: 591582">This is the box I did for 2 DD 9918&#039;s.&nbsp; The owner is going to change amps and get away from full bridge.I really don&#039;t think most full bridge amps perform like half bridge amps (more expensive and larger amps).&nbsp; These are literally DD&#039;s highest powered ferrite subs, and they can take tons of power.&nbsp; When overpowering subs and pushing them to the extremes on music, where you&#039;re changing frequencies and impedance (amp load based on sub movement, basically), and the sub is cone is having high travel, then you really need an amp that can handle high excursion.&nbsp; A 4&quot; VC woofer with a powerful motor and long throw, that cause a lot of energy to be fed back into the amp.&nbsp; Low notes or playing far away from port frequency can cause such high excursion (like xmax), and that stresses the amp.&nbsp; The fundamental way a half-bridge is wired seems to allow the amp to dampen itself by using the power supply, aka all of your batteries and what not.&nbsp; Many full bridges don&#039;t seem to have the same type of dampening factor, so they lose control of the woofer&#039;s cone earlier or more easily.&nbsp; This isn&#039;t a guess, because I know a lot of people with 8kw+ systems, and they all run what seems to be half-bridge amps.&nbsp; I hear the same stories over and over and over about most full bridge sub amps; they just don&#039;t perform on music as well. One of the favorite amp series that I know right now for the high powered builds (8kw+) are the Sundown Salt series.&nbsp; Go look at the dampening factor on that amp.&nbsp; Then, go look at the dampening factor of full bridge amps, if they even have the gal to post it, lol.&nbsp; I swear, that has to be the most overlooked amp stat for subwoofer amps.&nbsp; I seem to rant about it weekly.</blockquote>

[QUOTE="Buck, post: 8763672, member: 591582"] This is the box I did for 2 DD 9918's. The owner is going to change amps and get away from full bridge. I really don't think most full bridge amps perform like half bridge amps (more expensive and larger amps). These are literally DD's highest powered ferrite subs, and they can take tons of power. When overpowering subs and pushing them to the extremes on music, where you're changing frequencies and impedance (amp load based on sub movement, basically), and the sub is cone is having high travel, then you really need an amp that can handle high excursion. A 4" VC woofer with a powerful motor and long throw, that cause a lot of energy to be fed back into the amp. Low notes or playing far away from port frequency can cause such high excursion (like xmax), and that stresses the amp. The fundamental way a half-bridge is wired seems to allow the amp to dampen itself by using the power supply, aka all of your batteries and what not. Many full bridges don't seem to have the same type of dampening factor, so they lose control of the woofer's cone earlier or more easily. This isn't a guess, because I know a lot of people with 8kw+ systems, and they all run what seems to be half-bridge amps. I hear the same stories over and over and over about most full bridge sub amps; they just don't perform on music as well. One of the favorite amp series that I know right now for the high powered builds (8kw+) are the Sundown Salt series. Go look at the dampening factor on that amp. Then, go look at the dampening factor of full bridge amps, if they even have the gal to post it, lol. I swear, that has to be the most overlooked amp stat for subwoofer amps. I seem to rant about it weekly. [/QUOTE]

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