Is the issue blow by air through the VC gap? That happens on a lot of drivers with no dustcap and a small sealed chamber. The driver is meant for vented box and that will not be an issue. Or maybe this is a really large excessive leak? The sound difference in the video is mostly the extra bass you get when you isolate front and back of membrane. I couldn't tell how much was form blowby. Also that chamber is a small PVC pipe that is way smaller than recommended volume based on Vas.
Yes, I think you are correct - the hiss is air coming through the VC gap. I found more posts by the video author in the thread below. It looks like he is trying to make a compact bluetooth speaker, so it could be that he is using an inappropriate enclosure for this driver.
Dayton Audio joins the coaxial game. - AVS Forum | Home Theater Discussions And Reviews
Dayton Audio joins the coaxial game. - AVS Forum | Home Theater Discussions And Reviews
PE states this venting holes issue has been resolved. However, please compare these two photos:
Left one from
Dayton Audio CX120-8 4" Coaxial Driver with 3/4" Silk Dome Tweeter 8 Ohm
And the right one from
Dayton Audio CX120-8 4" Coaxial Driver with 3/4" Silk Dome Tweeter - SoundImports
Close inspection suggests that the photos are identical except the holes are just removed from the PE photo! Indeed, a reviewer at PE wrote " ...The other thing is the vents in the pole-piece is not solved, or i got drivers from a early batch..."
Caution...
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