Add Series Resistance of the Wire in TS measurement?

r_s_dhar · 24th July 2002, 08:51 AM

I have just completed TS measurement for my woofers (10R Resistor in series with the driver). My woofer has a DC resistance of 6.8 ohms but the wire connecting it to the signal generator adds anonther 1 ohm. Do I add this to the DC resistance of the driver?

In my calculations I have added the series resistance of the wire and the validation of sqrt(f1*f2)=Fs for the -3dB points agrees very well.

Ron E · 27th July 2002, 11:06 AM

the sqrt f1 f2 test is just a test for peak symmetry (or asymmetry caused by high VC inductance), Re does not affect it.

If you are doing the constant current method of T/S parameters measurement (big series resistor), the impedance of your cables doesn't matter because you are "calibrating" with a 10 ohm resistor, and using Re and Zmax to calculate Ro.... and so on.

24th July 2002, 08:51 AM	#1
r_s_dhar diyAudio Member Join Date: Jun 2002 Location: Mangalore, Karnataka State, India	Add Series Resistance of the Wire in TS measurement? I have just completed TS measurement for my woofers (10R Resistor in series with the driver). My woofer has a DC resistance of 6.8 ohms but the wire connecting it to the signal generator adds anonther 1 ohm. Do I add this to the DC resistance of the driver? In my calculations I have added the series resistance of the wire and the validation of sqrt(f1*f2)=Fs for the -3dB points agrees very well.

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27th July 2002, 11:06 AM	#2
Ron E diyAudio Member Join Date: Jun 2002 Location: USA, MN	the sqrt f1 f2 test is just a test for peak symmetry (or asymmetry caused by high VC inductance), Re does not affect it. If you are doing the constant current method of T/S parameters measurement (big series resistor), the impedance of your cables doesn't matter because you are "calibrating" with a 10 ohm resistor, and using Re and Zmax to calculate Ro.... and so on.