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<blockquote data-quote="Ivan Beaver" data-source="post: 137796" data-attributes="member: 30"><p>Re: dB calculations</p><p></p><p></p><p>No-it works the same way. You are simply doubling the power and the speaker and you get 6dB-assuming the speakers are close enough to each other within the freq range of interest.</p><p></p><p>It doesn't matter if the amp is inside the speaker or outside.</p><p></p><p>The reason for 6dB gets a bit "interesting". Some claim it is due to basically "double the voltage applied". WIth the same voltage applied to 2 speakers this "could" seem as a "logical" explanation.</p><p></p><p>The real answer is a little different.</p><p></p><p>Yes twice the power will result in a 3dB increase in level. The other 3dB basically comes from a change in the "radiation resistance" of the air-caused by the additional driver.</p><p></p><p>Since the way sound "works" is by compression and rarefraction. With more drivers acting-this "resistance" changes.</p><p></p><p>Yes it is small change-but it is not the amount of the change that makes a difference (just like wattage). Let's say it is a 1% change. That is not very much-UNTIL you consider what happens if you go from 1% to 2%. You have DOUBLED the amount.</p><p></p><p>Just like wattage. A change of 1 watt may not seem like much-unless you start with 1 watt. Starting with 100 watts-the additional 1 watt makes no difference.</p><p></p><p>It is for the same reason that it more and more subs to keep getting the same amount (dB) of change.</p></blockquote><p></p>
[QUOTE="Ivan Beaver, post: 137796, member: 30"] Re: dB calculations No-it works the same way. You are simply doubling the power and the speaker and you get 6dB-assuming the speakers are close enough to each other within the freq range of interest. It doesn't matter if the amp is inside the speaker or outside. The reason for 6dB gets a bit "interesting". Some claim it is due to basically "double the voltage applied". WIth the same voltage applied to 2 speakers this "could" seem as a "logical" explanation. The real answer is a little different. Yes twice the power will result in a 3dB increase in level. The other 3dB basically comes from a change in the "radiation resistance" of the air-caused by the additional driver. Since the way sound "works" is by compression and rarefraction. With more drivers acting-this "resistance" changes. Yes it is small change-but it is not the amount of the change that makes a difference (just like wattage). Let's say it is a 1% change. That is not very much-UNTIL you consider what happens if you go from 1% to 2%. You have DOUBLED the amount. Just like wattage. A change of 1 watt may not seem like much-unless you start with 1 watt. Starting with 100 watts-the additional 1 watt makes no difference. It is for the same reason that it more and more subs to keep getting the same amount (dB) of change. [/QUOTE]
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