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The Sica 15K4 is definitely in the same league as the Kappa Pro 15LF,in some regards it's even better. You've got to respect a manufacturer posting the Klippel Xmax/ BL drop per millimetre, measurement in their pdf.
Is SICA 15k4 driver, good choice like the kappa pro 15lf?
I have a 24db octave High pass filter turned on on my crossover. I also have the 30hz 12db high pass filter turned on on my amp
So what is the frequency of your crossovers high pass?
The fact that you already have some sort of high pass in place and the 3015LF has a decent Xmech makes it reasonable that something else is going on. What excursion (peak-to-peak) do you estimate the cone is making when the noise occurs?
1. You're not looking at efficiency (that's in %), sensitivity is rated in dB/W/m
2. Sensitivity ratings are often hyped marketing figures, efficiency usually isn't
3. Efficiency and sensitivity have less influence in a Cubo 15 anyway
Cubo 15 with the 3015LF will have around 1 dB less overall sensitivity and 2 - 3 dB more power compression than Cubo 18 with the aforementioned drivers. Cubo 15 will likely sound better over 80 - 100 Hz. Cubo 18 is a step up in output, if you have the power to feed it and have tops with a good kick to them.
The SICA 15K4 can easily be used in both Cubo 15 (preferably Extra Extended otherwise Extended) and Cubo 15 Kick.
Best regards Cubo
It doesn't because Xmech on the 3015LF is 17 mm, which means it might start to distort a bit but is a far stretch from clapping against the back plate. So unless your 40 Hz, 24 dB/ octave high pass does work out, I would go look for construction-errors.
I believe it is at about 9mm of Excursion, so I suppose that lines up
Around 101 dB/W/m, above 50 Hz, though some driver get as high as 103 dB/W/m.
Thank you for that clarification. Is the sensitivity of the cubo 15 102db @ 1w/1m? I am going to be doing some measurements here shortly with a measurement mic I just purchased.
In general, sensitivity is less important in designs that boost the drivers efficiency quite a bit, like the Cubo-series. A lower sensitivity driver will bring down the average (by bringing down only a part of the total frequency response) but most 15" PA driver are within 1.5 - 3.5% efficiency (so the fluctuation isn't that big anyway).
Why is the sensitivity less important in the cubo series?