Carlspeak Posted February 21, 2012 Report Share Posted February 21, 2012 Below is a 10-20kHz scan of the infamous later model AR3a woofer's No. 9 coil. The same measurement techneque was used here as in the 'good, bad & ugly cap' measurement thread. Only with this measurement, the red impedance line curves upwared from left to right and phase starts at about 0 deg and end close to +90 Deg. What's of most interest here is the Z-impedance column. Note how impedance varies with frequency and how impedance climbs rapidly above the 500 hz roll off point of the woofer. Also note the far right column showing true inductance at each freq. For most of the scan it's 2.81 mH - close to the target of 2.85 mH for a #9 coil. Link to comment Share on other sites More sharing options...
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