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some regular questions
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<blockquote data-quote="squeak9798" data-source="post: 1404362" data-attributes="member: 555320"><p>Vd? The volume of air the subwoofer can displace.</p><p></p><p>Sd * Xmax</p><p></p><p></p><p>As above...Sd (cone area) and Xmax (linear travel).</p><p></p><p>Lets take a look at the W7 series;</p><p></p><p>8w7:</p><p></p><p>Sd - 0.0245 square meters (24500 sq.mm.)</p><p></p><p>Xmax - 19 mm (.019m)</p><p></p><p>10W7:</p><p></p><p>Sd - 0.0386 square meters (38600 sq.mm.)</p><p></p><p>Xmax - 23 mm (.023m)</p><p></p><p>For comparison purposes, you could just multiply Sd * Xmax and determine which displaces more air, and which has the potential for more output.</p><p></p><p>8w7;</p><p></p><p>245cm^2 * 1.9cm = 465.5cm^3 = 0.4655L</p><p></p><p>10w7:</p><p></p><p>386cm^2 * 2.3cm = 887.8cm^3 = 0.8878L</p><p></p><p>So, the 10w7 has about 90% more displacement than the 8w7</p><p></p><p></p><p>I guess it depends on what you consider "obvious".</p><p></p><p>Better build quality. More output potential. Better sound quality. Just a better overall subwoofer design.</p><p></p><p></p><p>Couldn't tell ya.</p><p></p><p></p><p>Sometimes for more motor force. Sometimes they stack magnets for more rearward clearance (cheaper to stack magnets than add more steel). Sometimes it's simply for cosmetics/aesthetics.</p><p></p><p>Also depends on the type of magnets used. Neo motor structures look small because the magnet itself is much smaller while having just as much actual magnetic force.</p><p></p><p></p><p>What do you mean? In width?</p><p></p><p></p><p>A voice coil is a length of wire wrapped around a former which is then attached to the backside of the cone. The voice coil is therefore suspended in the magnetic field created by the magnet, top and bottom plates. The voice coil is the part of the speaker that the power from the amplifier is applied to, and the current flowing through the voice coil creates an electromagnetic field that reacts against the static magnetic field in the gap (created by the magnet, top plate and bottom plate)....and this reaction between the opposing magnetic fields causes the subwoofers cone to move forward and backward.</p><p></p><p>For more info on motor design; <a href="http://ldsg.snippets.org/motors.php3" target="_blank">http://ldsg.snippets.org/motors.php3</a></p><p></p><p>Voice coils of varying sizes wrapped around the VC formers:</p><p></p><p><img src="http://www.alibaba.com/photo/10373094/VOICE_COIL.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p></p><p>Yes;</p><p></p><p><a href="http://forums.caraudio.com/vb/showthread.php?t=133943&amp;highlight=effective+radiating+area" target="_blank">http://forums.caraudio.com/vb/showthread.php?t=133943&amp;highlight=effective+radiating+area</a></p><p></p><p><a href="http://forums.caraudio.com/vb/showthread.php?t=136784&amp;highlight=effective+radiating+area" target="_blank">http://forums.caraudio.com/vb/showthread.php?t=136784&amp;highlight=effective+radiating+area</a></p></blockquote><p></p>
[QUOTE="squeak9798, post: 1404362, member: 555320"] Vd? The volume of air the subwoofer can displace. Sd * Xmax As above...Sd (cone area) and Xmax (linear travel). Lets take a look at the W7 series; 8w7: Sd - 0.0245 square meters (24500 sq.mm.) Xmax - 19 mm (.019m) 10W7: Sd - 0.0386 square meters (38600 sq.mm.) Xmax - 23 mm (.023m) For comparison purposes, you could just multiply Sd * Xmax and determine which displaces more air, and which has the potential for more output. 8w7; 245cm^2 * 1.9cm = 465.5cm^3 = 0.4655L 10w7: 386cm^2 * 2.3cm = 887.8cm^3 = 0.8878L So, the 10w7 has about 90% more displacement than the 8w7 I guess it depends on what you consider "obvious". Better build quality. More output potential. Better sound quality. Just a better overall subwoofer design. Couldn't tell ya. Sometimes for more motor force. Sometimes they stack magnets for more rearward clearance (cheaper to stack magnets than add more steel). Sometimes it's simply for cosmetics/aesthetics. Also depends on the type of magnets used. Neo motor structures look small because the magnet itself is much smaller while having just as much actual magnetic force. What do you mean? In width? A voice coil is a length of wire wrapped around a former which is then attached to the backside of the cone. The voice coil is therefore suspended in the magnetic field created by the magnet, top and bottom plates. The voice coil is the part of the speaker that the power from the amplifier is applied to, and the current flowing through the voice coil creates an electromagnetic field that reacts against the static magnetic field in the gap (created by the magnet, top plate and bottom plate)....and this reaction between the opposing magnetic fields causes the subwoofers cone to move forward and backward. For more info on motor design; [URL="http://ldsg.snippets.org/motors.php3"]http://ldsg.snippets.org/motors.php3[/URL] Voice coils of varying sizes wrapped around the VC formers: [IMG]http://www.alibaba.com/photo/10373094/VOICE_COIL.jpg[/IMG] Yes; [URL="http://forums.caraudio.com/vb/showthread.php?t=133943&highlight=effective+radiating+area"]http://forums.caraudio.com/vb/showthread.php?t=133943&highlight=effective+radiating+area[/URL] [URL="http://forums.caraudio.com/vb/showthread.php?t=136784&highlight=effective+radiating+area"]http://forums.caraudio.com/vb/showthread.php?t=136784&highlight=effective+radiating+area[/URL] [/QUOTE]
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