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<blockquote data-quote="squeak9798" data-source="post: 1412059" data-attributes="member: 555320">It won&#039;t *sound* two times louder...it takes 6db to 10db to be perceived as &quot;twice as loud&quot; by the human ear.And, as I and lilmaniac pointed out.....those are only theoretical numbers.&nbsp; Real world results will depends on many, many, many different variables.And even then....&quot;on the same amp&quot; is a little limiting, since most amps will not produce the same power output into multiple loads (PG Xenon and JL Audio Slash amps will, however).&nbsp; Say you, for example, have a single DVC 4ohm/coil sub wired in parallel to 2ohm, and an amp that&#039;s only stable down to 2ohms.&nbsp; Well, if that amp puts out 500w @ 2ohm and 250w @ 4ohm, then that single DVC 4ohm speaker wired to 2ohm will be recieving 500w.&nbsp; Now, add a second DVC 4ohm/coil speaker and you&#039;re only option is to wire the subwoofers to 4ohm (while still presenting a &quot;safe&quot; load to the amplifier), where the pair will only receive 250w....or 125w each.It is correctly stated as two subs off of the same power will yield a theoretical 3db increase in output.&nbsp; Not off the same amp, but the same power.</blockquote>

[QUOTE="squeak9798, post: 1412059, member: 555320"] It won't *sound* two times louder...it takes 6db to 10db to be [I]perceived[/I] as "twice as loud" by the human ear. And, as I and lilmaniac pointed out.....those are only [I]theoretical[/I] numbers. Real world results will depends on many, many, many different variables. And even then...."on the same amp" is a little limiting, since most amps will not produce the same power output into multiple loads (PG Xenon and JL Audio Slash amps will, however). Say you, for example, have a single DVC 4ohm/coil sub wired in parallel to 2ohm, and an amp that's only stable down to 2ohms. Well, if that amp puts out 500w @ 2ohm and 250w @ 4ohm, then that single DVC 4ohm speaker wired to 2ohm will be recieving 500w. Now, add a second DVC 4ohm/coil speaker and you're only option is to wire the subwoofers to 4ohm (while still presenting a "safe" load to the amplifier), where the pair will only receive 250w....or 125w each. It is correctly stated as two subs off of the same [I]power[/I] will yield a theoretical 3db increase in output. Not off the same amp, but the same [I]power[/I]. [/QUOTE]

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