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#1751 | |
diyAudio Member
Join Date: Jan 2011
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Quote:
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#1752 |
diyAudio Member
Join Date: Dec 2009
Location: Les Pays-Bas
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#1753 | |
diyAudio Member
Join Date: Nov 2008
Location: Devon UK
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Quote:
Of course this is exponential so for each 3db we need 2 - 4 - 8 - 16 etc drivers. The other rule is the speakers must be within a quarter wavelength of each other. So as the speaker stack increases in size the maximum frequency that the 3db gain effect applies drops. At 100 hz the wavelength is 3.44 metres so a quarter wavelength is 86cm ![]() Put simply if you have a pair of bass bins and you place them together, instead of separating them like a stereo pair, you gain an extra 3db, which can be very useful in a small PA setup. ![]() Once you get above 2 subs in a row you can run into other problems, including beaming. |
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#1754 | |
diyAudio Member
Join Date: Jan 2008
Location: Florida
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Quote:
Multiple Cabinet Combined Response Some of the tests were running multiple cabinets in series, each doubling of cabinets halved the power to each individual cabinet, the output remained the same. In addition to the 6 dB increase by doubling the quantity of equally powered speakers coupled within 1/4 wave length, the added frontal area effectively creates another boundary, which increases forward gain even more. Horn Extender/Wave-guide for TH Art Welter |
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#1755 |
diyAudio Member
Join Date: Dec 2011
Location: Idaho, US
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Just to make sure we are on the same page... by "keeping the same power but doubling cone area", we are talking about going from 1 watt to a single driver to 1/2 watt per each driver of two (meaning, same exact amount of power in total)? By doubling your drivers and giving them the same amount of wattage per as before, you are doubling both drivers and total wattage.
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#1756 | |
diyAudio Member
Join Date: Feb 2004
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Quote:
Efficiency and sensitivity conversion - loudspeaker percent and dB per watt and meter loudspeaker efficiency versus sensitivity vs - sengpielaudio Sengpiel Berlin |
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#1757 | |
diyAudio Member
Join Date: Dec 2011
Location: Idaho, US
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Quote:
So unless that calculator is wrong, it seems that the drivers themselves don't actually "add" to the equation when it comes to gaining decibels, but simply gives you more "headroom" for more power from the amplifiers to become louder. |
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#1758 |
diyAudio Member
Join Date: Dec 2009
Location: Les Pays-Bas
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Hi guys,
Drivers are not completely passive electrical circuits. You need to realise that "doubling the cone area" also means doubling the motors. Doubling the motors means doubling the magnet power, which is an energy source! In other words, a system of two drivers has twice the motor power and therefore becomes two times more efficient (is 3dB) with the same power. Last edited by Djim; 10th October 2012 at 06:29 PM. |
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#1759 | |
diyAudio Member
Join Date: Feb 2004
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Quote:
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#1760 |
diyAudio Member
Join Date: Dec 2009
Location: Les Pays-Bas
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