Hi gang.
I am trying to find the problem of my setup because I get weird values when measuring TSP.
ESI U22xt USB sound card fed only by usb power.
Phone out, L R line in.
All three bars (out, ref in, normal in) show 12 db at 1khz test tone.
109 Ohm sens resistor made of 2x 220 ohm 0.25watts resistors in parallel.
Open leads calibration shows a nice straight line.
Closed leads is a little ragged past 10khz.
8 Ohm calibration again really nice.
Results measuring speaker impedance
shows a peak at 95 Hz although 12 inch speaker has definitely it's resonance below 50hz.
Same strange impedance results with little 3 inch speaker at about double the resonance.
Any help is greatly appreciated.
Radian
I am trying to find the problem of my setup because I get weird values when measuring TSP.
ESI U22xt USB sound card fed only by usb power.
Phone out, L R line in.
All three bars (out, ref in, normal in) show 12 db at 1khz test tone.
109 Ohm sens resistor made of 2x 220 ohm 0.25watts resistors in parallel.
Open leads calibration shows a nice straight line.
Closed leads is a little ragged past 10khz.
8 Ohm calibration again really nice.
Results measuring speaker impedance
shows a peak at 95 Hz although 12 inch speaker has definitely it's resonance below 50hz.
Same strange impedance results with little 3 inch speaker at about double the resonance.
Any help is greatly appreciated.
Radian