I'd just like to share my impedance measurement results from my Maelstrom that I will be putting in a box soon. I've given it about 24 hours of break-in. Measurements were performed with speaker workshop, a Wallin Jig v2, and EMU 0404 usb.
It is one of the recent single-coil 4ohm versions
Fs: 17.8 Hz
Re: 3.43 Ohms
Le: 3.92 mH
Qms: 5.786
Qes: 0.454
Qts: 0.42
When these parameters were modeled (using the spec'd Vas and Bl values) the results were practically identical to the model with standard values. This speaks a lot about the quality and consistency over different runs and coil configurations, bravo Kevin.
My unknowns are still Bl, Vas, Cms, and Mms. If I can get just one of them the others can be calculated. I wonder which should be the closest to the specified value - perhaps Mms?
I will try to measure Vas using the added mass method tomorrow but for something with so low of a tuning this probably wont work as well as the sealed box method - which I can't do.
It is one of the recent single-coil 4ohm versions
Fs: 17.8 Hz
Re: 3.43 Ohms
Le: 3.92 mH
Qms: 5.786
Qes: 0.454
Qts: 0.42
When these parameters were modeled (using the spec'd Vas and Bl values) the results were practically identical to the model with standard values. This speaks a lot about the quality and consistency over different runs and coil configurations, bravo Kevin.
My unknowns are still Bl, Vas, Cms, and Mms. If I can get just one of them the others can be calculated. I wonder which should be the closest to the specified value - perhaps Mms?
I will try to measure Vas using the added mass method tomorrow but for something with so low of a tuning this probably wont work as well as the sealed box method - which I can't do.