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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Zobel's attenuation on driver posted by hZ on May 3, 1999 at 01:25:08:
I toke my Morel MDT40 T/S parameters:Re = 5.45ohm
Le = 0.05mH
fs = 700hz
f1 = 500hz
f2 = 1kHz
Zmin = 6.0ohm
Zmax = 9.9ohm
+---Cs---+
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0---+---Rs---+---Re---Le---0
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+---Ls---+where:
Rs = Zmax - Re = 4.45ohm
Cs = 1/(Re*2*Pi*f2) = 29.2uF
Ls = Re/(2*Pi*f1) = 1.735mHI wired a notch filter but virtually nothing happened, which could be expected due to the small size of the impedence spike & the couple octaves distance away from the XO point. I then wired a Zobel of:
0---Cz---Rz---0where:
Rz = Zmin = 6.0ohm
Cz = Le/Rz/Re = 1.529uFAnd, low & behold, a 2dB boost occurred between 5-10kHz, up & disappeared by installing a Zobel. Mind you, an 8kHz reasonant interplay between the XO cap & the voice-coil inductance was overted by the Zobel. In fact, the response curve resembles a unit Q 2nd-order XO roll-off knee.
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