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DIY For Audio
My subwoofer design methods and considerations
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<blockquote data-quote="johnc" data-source="post: 165608" data-attributes="member: 2084"><p>You asked for it. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p><p></p><p>On 8 Dec you wrote :</p><p>"For the IB: If 30Watt is a gain of 14.8 dB, then 14.8 dB + 6 dB = 20.8 dB which will result in a power demand of 120.2 Watt"</p><p></p><p>My opinion is that you are out by a factor of 10 or thereabouts. The correct value is more like 12 Watt.</p><p>All the power values you have stated assume an impedance of 8 Ohms.</p><p>As Martin wrote, this is not the case.</p><p></p><p>If you look at the "amplifier apparent load power (VA)" graph, you will see the correct power values vs frequency.</p><p></p><p>This should matter to you because:</p><p>"8. Low power compression - I want the driver to convert as much amplifier power into bass as possible. Power compression is the enemy."</p><p></p><p>If you make design choices based on sensitivity instead of efficiency then you won't minimise power compression.</p><p>If power compression really is the enemy, you would be wise to consider the "amplifier apparent load power (VA)" graphs.</p><p></p><p>Just my opinion. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p></blockquote><p></p>
[QUOTE="johnc, post: 165608, member: 2084"] You asked for it. ;) On 8 Dec you wrote : "For the IB: If 30Watt is a gain of 14.8 dB, then 14.8 dB + 6 dB = 20.8 dB which will result in a power demand of 120.2 Watt" My opinion is that you are out by a factor of 10 or thereabouts. The correct value is more like 12 Watt. All the power values you have stated assume an impedance of 8 Ohms. As Martin wrote, this is not the case. If you look at the "amplifier apparent load power (VA)" graph, you will see the correct power values vs frequency. This should matter to you because: "8. Low power compression - I want the driver to convert as much amplifier power into bass as possible. Power compression is the enemy." If you make design choices based on sensitivity instead of efficiency then you won't minimise power compression. If power compression really is the enemy, you would be wise to consider the "amplifier apparent load power (VA)" graphs. Just my opinion. ;) [/QUOTE]
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DIY & Tutorials
DIY For Audio
My subwoofer design methods and considerations
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