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In Reply to: RE: What do you make of this? (Impedance curves) posted by pix on March 04, 2017 at 07:44:06
I simply used a free generator app i my iPhone as a source, using my 300B tube amp driving.
Ur and Uz is multimeters reading AC (rms) voltage
R is a 10,1 Ohm (low inductance) resistor
A second resistor of 10,1 Ohms where used as Z giving a deviation curve used for calibration.
The tested speaker filter shown below accept for C5 which where 0,68uF
Bas: Beyma P15Fe in a Karlsson K-15 cab
Mid: Radian 750Pb (Similar to 850Pb) in a Tricstrax horn
Hi: Fostex T90A
all of my good K15 Z plots are gone from the internet - I\ll have to look and see if some still exist. Here's some early ones using Speaker Workshop - looks like there could have been some noise. K15 is tuned in the high 40's
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