calculating Qms' of RDO with T/S parameters - diyAudio
 calculating Qms' of RDO with T/S parameters
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 Multi-Way Conventional loudspeakers with crossovers

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 9th December 2009, 08:12 PM #1 diyAudio Member   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 where 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) where 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. Regards, Pete

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