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Message: <blockquote data-quote="Kippo" data-source="post: 1162248" data-attributes="member: 10096">installing a sub in infinite baffle, IB (here ppl call it 'free air') is equivalent of using a very large box where the vol. is more than 4 times the sub VAS (suspension compliance).The response is similar of using very large sealed box where Qtc will be low eg. 0.5 & you will get response in good low end extension but lacking in upper end.due to the large box, sub efficiency is higher so the power handling is a lot lower. If the power is not controlled, u will get mechanical damage.one thing u must know that not all subs are suitable for IB setup (free air). Ask ur installer to refer to the sub manual or dealer first.also doing IB setup is not easy. It is not as easy as what most ppl think of.1. u need to ensure that there will be no leaks to inside cabin. If the sub rear wave leak into the cabin, u will get cancellation.2. Like any sub enclosure/box, u need to get it rigid by adding a lot of sound dampening. If not, your car boot will vibrate or flexing hence creating secondary sound i.e distortion & uneven response. With the plenty of sound dampening to be used, it is not a cheap solution.3. U need good mid-drivers to cover the lack of upper bass freq. So cannot say this is SQ setup if there are missing or lack of required freq. response.On Revac sub, i've never heard of it so i can't comment. But if the price is higher than established good sub brands then i better get the cheaper one. No point paying more for brand alone.cheers.</blockquote>

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