fmedina Posted November 10, 2011 Report Share Posted November 10, 2011 i know what the "fs" of a sub means. but what exactly is the "fms" of a sub? is it the same sh!t? wasnt able to find the meaning Quote Link to comment Share on other sites More sharing options...
fmedina Posted November 10, 2011 Author Report Share Posted November 10, 2011 ... Quote Link to comment Share on other sites More sharing options...
loudNlow87 Posted November 11, 2011 Report Share Posted November 11, 2011 (edited) Measure Frequency of Mechanical System Resonance - Fms Traditionally, Fms was found using a voltmeter or oscilloscope and watching for a voltage peak. The problem with this solution is that the peak might be wide and the voltage vacillating, as the speaker transforms acoustic energy into voltage. Another problem with the original method is that the effects of Rem/Xem (or Le for the older generation model) were not considered skewing the results. The Woofer Tester overcomes these limitations by searching for the first zero phase-crossing to find Fms. This technique has several advantages: * The rate of phase change with frequency is greater than the rate of voltage change. The test is therefore more sensitive to changes in Fms and less sensitivity to noise. * Unlike other tools that interpret phase from impedance, the Woofer Tester actually measures phase * If the point of interest is passed during a frequency scan, the tester software will reverse direction and scan in the opposite direction with half of the original step ratio. This back and forth search continues until the terminal ratio is hit. The default terminal ratio is set to 0.1% but can be set to higher (or lower) precision. * The effects of Rem and Xem are taken into account during this test. The result is a 'bare' circuit model for the TS parameters. This leads to a higher degree of acuracy when it comes to extracting the remaining electrical and mechanical parameters * Rem/Xem effects are also simultaneously modeled using the Woofer Tester Simulator core. This feedback ensures that the final simulation is also more acurate. * Narrow-band, real-time digital lock-on filters are used to further reduce noise. These filters have complex (real and imaginary outputs) and are reconstructed for each frequency point to ensure that they are exactly centered on the frequency of interest. Pasted from a random site.. Looks like the same thing.. Edited November 11, 2011 by loudNlow87 Quote '11 Jeep Patriot New Build Head Unit: Pioneer AVH-P3200DVD Front: Massive CK69 Components Front Amp: Massive NX2 Rears: Infinity Kappa's Subs: 8 Sundown SA-8 v2's Sub Amp: AB 450.1 XS D3100 Come on 150! Link to comment Share on other sites More sharing options...
fmedina Posted November 11, 2011 Author Report Share Posted November 11, 2011 Ya that's what skar has in its specs. I wonder if its the same as fs Quote Link to comment Share on other sites More sharing options...
fmedina Posted November 11, 2011 Author Report Share Posted November 11, 2011 Hmm good find Quote Link to comment Share on other sites More sharing options...
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