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<blockquote data-quote="Relax" data-source="post: 2455644" data-attributes="member: 571303">anecho- echoLess chamber- means only the sub&#039;s output is measured, no cancelation or addition of waves.To gain 3db when double surface area, the same amount of power needs to be given to each woofer.&nbsp; Meaning 1 12 sub on 200w is in theory as loud as 2 12 subs on 100w.&nbsp; You give them 200w each and you get +3db.The problem comes when people say add a subwoofer.&nbsp; Depending on how you wire subs up- you may not need to add power at all to see this increase.&nbsp; Example would be a mono amp that does 200w at 4 ohms, 400w at 2 ohms.&nbsp; Say we hook the single 12 above up (its a 4 ohm sub) it would get 200w.&nbsp; If we parallel the second sub for 2 ohms- the amp will put out 400w.&nbsp; Hence we get the same 200w to each woofer and 2 x the cone area.&nbsp; But if this amp only did 300w at 2 ohms- we would see less then 3 db increase.Of course none of this really matters, as doing any of this in a car would probably result in a greater increase, somewhere around 6dB I would guess.</blockquote>

[QUOTE="Relax, post: 2455644, member: 571303"] anecho- echoLess chamber- means only the sub's output is measured, no cancelation or addition of waves. To gain 3db when double surface area, the same amount of power needs to be given to each woofer. Meaning 1 12 sub on 200w is in theory as loud as 2 12 subs on 100w. You give them 200w each and you get +3db. The problem comes when people say add a subwoofer. Depending on how you wire subs up- you may not need to add power at all to see this increase. Example would be a mono amp that does 200w at 4 ohms, 400w at 2 ohms. Say we hook the single 12 above up (its a 4 ohm sub) it would get 200w. If we parallel the second sub for 2 ohms- the amp will put out 400w. Hence we get the same 200w to each woofer and 2 x the cone area. But if this amp only did 300w at 2 ohms- we would see less then 3 db increase. Of course none of this really matters, as doing any of this in a car would probably result in a greater increase, somewhere around 6dB I would guess. [/QUOTE]

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