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Split coil Fi? Sexiness!
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<blockquote data-quote="jimrhit" data-source="post: 6585158" data-attributes="member: 573319"><p>After a few minutes looking at this ... I'll venture a guess as to what they are doing ..</p><p></p><p>Dual Gap, diff drive but not exactly the same, since the circuit is more efficient in some respects.</p><p></p><p>Looks like the center gap is made of the two top plates. If the two magnets are charged reverse of each other (and somehow held together with those seemingly small screws), they would be effectively doubling B in the center gap (relative the just the lower motor alone). The top circuit is a bit less efficient than the bottom given the extra reluctance of an air gap vs back plate, but nonetheless you are getting quite a lot more B (kind of like adding a bucking magnet .. in this case, it is a bucking motor. Looks like the top gap is really 1/2 the length of the lower gap, but the pole extension will make the effective gap a bit bigger, especially with such a large VC OD.</p><p></p><p>They then use the second gap, similar to how JBL does with diff drive, with a reverse wound coil to take advantage of the gap they needed to create to allow the former to pass through.</p><p></p><p>The total effect is much more B on the "main" gap, with the second, reverse wound coil taking advantage of the second gap. Overall, you basically have two very high B gaps and two coils. They have canceled out most of the inductance (assuming the windings are the same for each coil) and gotten a lot of motor force in a really deep package.</p><p></p><p>So, the top coil is reverse wound vs. the lower coil and the mech limits are controlled by electric braking from each coil on the up/down stroke entering the other gap. Super High Xmax, lower turns relative to a multi-layer coil, better HF reproduction/dynamics/speed, easier for amps to drive, (relatively) lower moving mass</p><p></p><p>Would like to see some real world specs and measurements on this guy .. pretty interesting.</p><p></p><p>note - this could be 100% wrong, but this is what my mccafe is telling me right now</p><p></p><p>As far as isobaric, kind of ... you are adding a second (but maybe not doubling like iso, just using up the lost B and adding a elect. brake) motor force to the same diaphragm assembly, lowering qts allowing you to stiffen up the spider and keep a relatively low qts while lowering vas and t/s based enclosure requirements for a given in-box qtc.</p></blockquote><p></p>
[QUOTE="jimrhit, post: 6585158, member: 573319"] After a few minutes looking at this ... I'll venture a guess as to what they are doing .. Dual Gap, diff drive but not exactly the same, since the circuit is more efficient in some respects. Looks like the center gap is made of the two top plates. If the two magnets are charged reverse of each other (and somehow held together with those seemingly small screws), they would be effectively doubling B in the center gap (relative the just the lower motor alone). The top circuit is a bit less efficient than the bottom given the extra reluctance of an air gap vs back plate, but nonetheless you are getting quite a lot more B (kind of like adding a bucking magnet .. in this case, it is a bucking motor. Looks like the top gap is really 1/2 the length of the lower gap, but the pole extension will make the effective gap a bit bigger, especially with such a large VC OD. They then use the second gap, similar to how JBL does with diff drive, with a reverse wound coil to take advantage of the gap they needed to create to allow the former to pass through. The total effect is much more B on the "main" gap, with the second, reverse wound coil taking advantage of the second gap. Overall, you basically have two very high B gaps and two coils. They have canceled out most of the inductance (assuming the windings are the same for each coil) and gotten a lot of motor force in a really deep package. So, the top coil is reverse wound vs. the lower coil and the mech limits are controlled by electric braking from each coil on the up/down stroke entering the other gap. Super High Xmax, lower turns relative to a multi-layer coil, better HF reproduction/dynamics/speed, easier for amps to drive, (relatively) lower moving mass Would like to see some real world specs and measurements on this guy .. pretty interesting. note - this could be 100% wrong, but this is what my mccafe is telling me right now As far as isobaric, kind of ... you are adding a second (but maybe not doubling like iso, just using up the lost B and adding a elect. brake) motor force to the same diaphragm assembly, lowering qts allowing you to stiffen up the spider and keep a relatively low qts while lowering vas and t/s based enclosure requirements for a given in-box qtc. [/QUOTE]
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