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I should have Dune pt1 measured next week. JSS

Jami, Thanks for the cnc files and sharing them! I'm sure it will be a huge help to some other builders. I know it probably took some time to put those together.

Hello Andyman3k. Nice work and thanks for the measurements. QSC eh? I've used my share of QSC amps and speakers over the years. The impedance plot suggests that the tuning of the vents is near 30hz or so. That's right about where it should be. The corner drooping a little is probably due to the 8 ohm 21sw152 having a little lower motor force than some of the other drivers used. That's one effect is that the vents aren't loaded as aggressively which results in a little bit of a roll off before the tuning. Not the end of the world in the scheme of things. In general you'll get a sharper more aggressive low corner with drivers having more motor force ( BL^2/Re) / lower qts. My cabs are usually a bit undersized vs extension and thus require extra energetic drivers. That indoor measurement rig sounds intriguing. Too bad it's not for public consumption. Am I correct that the polar work was conducted outside but the FR and Imp were on the inside rig? Nice measurement rig. Again thanks for sharing your info. More data is always welcome.

OK. I'm Now decided to build the amazing SKRAM. Like always you're so helpful Ricci, Many thanks Mr. designer speaker genius. 😉