|Multi-Way Conventional loudspeakers with crossovers|
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|9th December 2009, 09:12 PM||#1|
Join Date: Nov 2005
calculating Qms' of RDO with T/S parameters
As formulated by Ron E (a frequent contributor here),
Qms' = 2*pi*Fs**Mt/Rmt
Qms' = modified mechanical Q in free air of a DVC woofer with one of the voice coils made unenergized and resistively damping the driver given a resistor across its terminations
Fs = free air resonance frequency
Mt = total moving mass of the driver
Rmt = total mechanical resistance = mech. resistance of the driver Rms + resistive damping
Based on relations between the fundamental mechanical parameters of Ron E's equation and the T/S parameters, I derived
Qms' = Rt*Qms*Qes/(Re*Qms + Rt*Qes)
Rt = Re + Rx
Rx = resistance of the resistor connected across the terminations of the unenergized coil
Qes = electrical Q of the DVC driver with terminations of one of the driver's coils open and unconnected.
This should be helpful to anyone using RDO as T/S parameters are the ones usually on the spec. sheet for a woofer and not all of the mechanical parameters required for calculating modified Qms by Ron E's equation.
Please let me know if think that my equation is faulty or if you would like to see its derivation.
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