Seas "Idunn 2.5"

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A revised a bit again, just minor tweaking of the notch filters. Here is the latest crossover, an SPL measurement, and an impedance measurement.

The lowest impedance is 4,24 ohms, and the lowest impedance phase angle is -40 degrees. The partitioning I did to the cabinet, took care of the oddity in impedance phase angle at the cabinet tuning point. Cabinet tuning is now 40 Hz with the dip of the saddle and impedance phase crossing zero neatly aligned.

SPL measurement with 2 ms gating and 1/12 octave smoothing.
 

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This is the End, my only Friend?

It seems that I might have exhausted any other options that may be better, and thus arrived to an end and a final solution for this project. The end looks like the attachments.

It turned out that the second capacitor for the tweeter's network was no longer needed to achieve 3rd order acoustical, so happily I discarded that.

The parallel resistor for the "primary woofer", i.e. the woofer playing all the middle range, is essential, as it was the only way to cut the blooming at 1 kHz. A bigger inductor just cut anything above 2 kHz or so, but not at 1 kHz or so, and hence was no solution.

The 47 μF capacitor was introduced at a latter stage in series with the primary woofer's parallel resistor for it not to affect bass response, and for to cut the power drainage of the resistor (adding to the overall power handling of the system).

The slight wobble of the impedances between the pair is due to the fact that I've been rearranging the internals and therefore taking stuffing out and putting it in again.

The SPL measurement is in-room, including all the in-room ugliness (modes at 40 and 80 Hz and the null at 60), 1/12 octave smoothing, no gating.
 

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  • Viimeisin jakosuodin 29.12.2017.jpg
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  • SPL 29.12.2017.JPG
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