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Bronze Member Username: HowtoeatapencilPost Number: 49 Registered: Mar-08 | I was looking at the Rd Alpha v.2 And it has 16mm Xmax and 53mm Xcoil What is the difference? Kevin explained to me that the this sub will produce as much SPL as other subs with larger xmax because it has a 25mm top plate and xmax is the distance from the top plate. I was just wondering what the difference is between xmax and xcoil? |
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Gold Member Username: •cam•BC Canada Post Number: 2400 Registered: Nov-06 | Dunno too much about these parameters but I thought Xmax was excursion (usually one-way) while maintaining Bl or a certain percentage of Bl. Quote from SSA: "Xmax/Xmech--------Short for Maximum Linear Excursion. Speaker output becomes non-linear when the voice coil begins to leave the magnetic gap. Although suspensions can create non-linearity in output, the point at which the number of turns in the gap (see BL) begins to decrease is when distortion starts to increase. Eminence has historically been very conservative with this measurement and indicated only the voice coil overhang (Xmax: Voice coil height minus top plate thickness, divided by 2). Xmech is expressed by Eminence as the lowest of four potential failure condition measurements times 2: Spider crashing on top plate; Voice coil bottoming on back plate; Voice coil coming out of gap above core; Physical limitation of cone. Take the lowest of these measurements then multiply it by two. This gives a distance that describes the maximum mechanical movement of the cone." |
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Gold Member Username: The_image_dynamicSan Diego, California Post Number: 3726 Registered: Dec-06 | Xmax is a term that is often misinterpreted as excursion. There are so many other factors involved that this spec is, in most cases, meaningless. Xcoil is simply the height of the voice coil. |
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Gold Member Username: •cam•BC Canada Post Number: 2402 Registered: Nov-06 | Get my PM, Brad? |
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Gold Member Username: The_image_dynamicSan Diego, California Post Number: 3727 Registered: Dec-06 | No, I rarely check them because they are sent to one of my alternate email addy's. I will look now. |
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Gold Member Username: The_image_dynamicSan Diego, California Post Number: 3728 Registered: Dec-06 | http://www.monstronix.com/hdd1764-p-408157.html |
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Silver Member Username: TeamrevolutionATLANTA, GA USA Post Number: 264 Registered: May-07 | Xcoil is height of the voice coil Xmax is coil height - top plate divided by 2. |
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Gold Member Username: •cam•BC Canada Post Number: 2403 Registered: Nov-06 | Thanks, Brad. |