Recent content by Caio Ferrari

I applied tihs (QES = omegaS*CMES*RE.) and got a Qts 0,55. Closer to the manual method but a little far from Limp.

The measurements above I did using REW. With limp I'm getting the same Fs and Qms as REW. Qt is 0,38 on "regular" mode and 0,45 using LSE minimization.

I just did a few measurements here from 20Hz-20kHz: Coil 1: Qt 0,928 (Calculation for two coils: 0,464) Coil 1: Qt 0,928 (Calculation for two coils: 0,464) Parallel: Qt 0,527 Series: Qt 0,603

I already did it. Limp gave me a Qt 0,4

Got it. But the problem is, when I provide a limited range, the results mach the manual measurement and the speaker datasheet. When I provide the full range, the Qes and Qts rises too much.

They have the same graph. Unfortunately I don't have another interface. I'd like to ask why the results are so different depending of the frequency range of the measurements. Since I'm stuck with Qe and Qt value, I ran some tests between 15-100Hz. I got Qt of 0,45. When I ran the test...

No, it really should be the same. Parallel or Series must have the same Qes. Only if I measured one voice coil I would have a Qes difference by a factor of two and I never measured this way.

That's great but, why I'm getting difference in Qes/Qts when I'm connecting voice coils in series or parallel. It should be the same, right?

Here, the two measurements made with voice coils in series and parallel Series Re = 7,1R Parallel Re = 1,7R

But, my driver Fs is about 37 Hz. Should it presenting problem? As soon as get my PC I'll come back here to attach me measurements.

Hi I've been using REW to measure a DVC sub (JBL GTO1014d) and I'm experiencing and issue. The sub has two 4 Ohm coils. When I measure the coils in parallel I'm getting some differences compared with coils in series. Fs, Qms are pretty close. Qes is 0,7 in series and 0,52 in parallel...