Driver Paramameters

[Sujies]

hello guys i was measuring driver params of a local driver and i got some wrong values and always get the same ,

can anyone tell me what is going wrong




Source Voltage Vs 0.99
Source Resistance Rs 9.70
Speaker DC resistance Re 7.80

Voltage across R 0.55
Source current (DC) Is 0.06

Voltage across R at resonance Vm 0.45
Current flow at resonance Im 0.05
Resonance frequency Fs 29.00

Speaker impedance at resonance (Rm) Rm 11.50

-3dB current Ir 0.05
r0 1.21
-3dB voltage Vr 0.50


Fh 32.00
Fl 27.00
Fs check 29.39

Cubic Feet of test box Vb 0.41
Resonance of driver in test box Fb 11.00

Vas -0.35
Qms 6.38
Qes 13.46
Qts 4.33

[e-side]

Originally posted by Sujies
hello guys i was measuring driver params of a local driver and i got some wrong values and always get the same ,

can anyone tell me what is going wrong

Resonance frequency Fs 29.00

Speaker impedance at resonance (Rm) Rm 11.50

Cubic Feet of test box Vb 0.41
Resonance of driver in test box Fb 11.00

Vas -0.35
Qms 6.38
Qes 13.46
Qts 4.33

You've got a very low impedance at the resonance frequency Fs.
The resonance of the driver in the test box is lower than the free air resonance, while it should be higher.

You might have done something wrong. If you're sure you didn't, then you could try the measurement instuctions at http://www.epanorama.net/documents/a...arameters.html.

hope this helps

regards

Erwin