High Efficiency Speaker Asylum

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New measurements

Posted by pix on March 17, 2017 at 05:32:28:

I am not sure how to link to several pictures in one post, so I add three separate posts.

First, I have measured the impediance of the complete speaker ones again. But this time from 10Hz upp to 20k.
This was just to make sure that the rising impedans low end cuve actually was a hugh peak. And it was.

Actually, I don�t see this 21Hz peak as a problem, since the Karlson K-15 does�nt play that low. But as a second thought, a peak of this size must come from some sort of resonance fenomena (back EMF), and hence needed to be tamed.

This was what I ment with acoustically corecting what�s been seen in my impedance measures.
Since mu bass woofer has a fairly low Q-value, I don�t recognise the transducer itself to resonate, but in combination with the K-15 cab, it propably does.

Could more wool inside the cab help? or could I decease the vent to lower the fb to even those two peaks ?