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Message: <blockquote data-quote="audioinformer" data-source="post: 6688976" data-attributes="member: 577879">The coil in the Nightshade v1 that I re-built had a 55mm winding width coil and a 25mm top plate. That would have 15mm X-max and I understand that it can move up to 27.5mm with 12.5mm of the coil out of the gap but, the X-max is 15mm.The RD Alpha v.2 that I re-built had a 50mm winding width coil and a 20mm top plate. That would have an X-max of 15mm and I understand that it could move up to 25mm with 10mm of coil out of the gap but, the X-max is 15mm.How to calculate X-max: Coil Winding Width minus Top Plate divide by 2.Nightshade v.1 (55 - 25 = 30 / 2 = 15) 15mm X-maxRD Alpha v.2 (50 - 20 = 30 / 2 = 15) 15mm X-maxX-max Definition: X-max is the amount by which the voice coil can move in one direction without it leaving the magnetic gap.</blockquote>

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