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Audio and Video Talk
General Discussion
Misconceptions in the SA general public regarding Home Cinema
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<blockquote data-quote="Vaughan" data-source="post: 1092"><p>I agree. BTW, what do you do for a living ? What's your story ? </p><p></p><p>Some people I have spoken to have told me that sealed subwoofers are more efficient than ported design. . .erm. . .well, no, sir, they ain't.</p><p></p><p>Some people who should know better have spilled the beans on this too. While a sealed design is basically emitting one sound wave (half of the back pressure in the cabinet is useless and doesn't contribute to the acoustical output in any way, shape or form), it's inefficient mainly because the amplifier has to basically boost the electronic signal to overcome the force of air pressure in the cabinet.</p><p></p><p>Oh, and because half of the back wave energy is not being used. Sure, the back wave is a good thing ( controls cone movement).</p><p></p><p>With ported subwoofers, you are basically emitting two sound waves (the driver and port) so you have two resonating systems here. This means greater efficiency. . .so, less back wave pressure working against the drivers.</p><p></p><p>Obviously ported designs have their famous 24db drop per octave. . .but at least cone exursions are less above the tuning point. Heck, even at the tuning point, the driver isn't really working <em>that</em> much. </p><p></p><p>Less distortion, lower bass extension (all things being equal here) more output. Cool. </p><p></p><p>Sealed designs have their advantages. Maybe you could expound on that one.</p><p></p><p>--Sincerely,</p><p></p><p></p><p></p><p>--Sincerely,</p></blockquote><p></p>
[QUOTE="Vaughan, post: 1092"] I agree. BTW, what do you do for a living ? What's your story ? Some people I have spoken to have told me that sealed subwoofers are more efficient than ported design. . .erm. . .well, no, sir, they ain't. Some people who should know better have spilled the beans on this too. While a sealed design is basically emitting one sound wave (half of the back pressure in the cabinet is useless and doesn't contribute to the acoustical output in any way, shape or form), it's inefficient mainly because the amplifier has to basically boost the electronic signal to overcome the force of air pressure in the cabinet. Oh, and because half of the back wave energy is not being used. Sure, the back wave is a good thing ( controls cone movement). With ported subwoofers, you are basically emitting two sound waves (the driver and port) so you have two resonating systems here. This means greater efficiency. . .so, less back wave pressure working against the drivers. Obviously ported designs have their famous 24db drop per octave. . .but at least cone exursions are less above the tuning point. Heck, even at the tuning point, the driver isn't really working [i]that[/i] much. Less distortion, lower bass extension (all things being equal here) more output. Cool. Sealed designs have their advantages. Maybe you could expound on that one. --Sincerely, --Sincerely, [/QUOTE]
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Audio and Video Talk
General Discussion
Misconceptions in the SA general public regarding Home Cinema
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