When making an enclosure, ideally one would make the walls non-parallel. But how is non-parallel is non-parallel? What about 5 degree on the front, is that non-parallel enough with a vertical back? I would assume at only 5 degrees enough wave would get back to the front. So what is the lowest limit? My thought would be one where the other side would not hit the other wall with a perpindicular line so maybe this would vary with the distance between the 2 walls? What has your experience been?
The question can be made to “what is the delta in the smallest and the longest dimensions enabled by the slanted walls. The length of the panel plays a role.
We do the trapezoid miniOnkens more for the outside shape than the inside but it does make a small difference.
dave
We do the trapezoid miniOnkens more for the outside shape than the inside but it does make a small difference.
dave
The teardrop does appear to be a good shape in some high end drivers. B&W uses that one. I thought of making a fiberglass teardrop shaped enclosures, still thinking...
For 'slap' echo to rapidly decay requires > ~6 deg/side, > 12 deg/included. Making the top/bottom this way and making the back of the cab a 'V' shape pointing at the baffle will do double duty bracing the cab and break up eigenmodes, further diffuse the whole internal 'mess' to the point of only needing little/no added damping for ~max acoustic efficiency.
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I was thinking about a trapezoid shape actually. I believe that is what you are talking about, the cuts on on the table saw would be harder but there should be little resonances. The bracing aspect is interesting because with the triangle shapes should be stronger, but even with vibrations?
So I'm looking at a super ugly 4 way but that is what grill cloth is made for! I am side loading the midbass, its crossed over at 250hz so hopefully it won't pull the ear over too much and I was just trying to get a good internal situation going. It doesn't show in this pic but the top is slanted a good amount, I did model a 5 degree slant on the front for the high end. Any other ideas? Again its going in a cabinet so this can be as ugly as it needs to be. Also thought of mounting the amps on the void there, this is an active setup.
Right, basically an LEDE room.
Vibration is a mass/rigidity problem, so either make it rigid enough to vibrate ~ an octave above its BW or mass load it to ~ an octave below it and since this can mean mini concrete bunkers in a sub's BW, best to limit it to the mids-up.