epoxy resin vs polyester resin sealing inside subwoofer box

[mlstrass]

I wasn't really talking about how fast the driver forces air in and out of a vent (which is a wide open area, not was I was asking you to picture), I was mainly addressing structural integrity and sealed enclosures to discuss the principal idea here, MDF being porous or not. My guess is if you wanted to get into surface roughness, drag coefficients for the various types, and wind speed as it pertains to laminar air flow, you would still be a off a bit in your thinking.

I don't bother thinking I build, test, and learn from that. Too many scientifice principles that make sense on paper, but don't transfer over to the real world when it comes to car audio.

Touching upon surface roughness I've done bare birch boxes and some coated with resin and sanded up to 1500grit and waxed. Sometimes you gain .1 - .2 on the meter and sometimes you don't. And you would never hear that little of a difference by ear...

[akadj]

Sometimes you gain .1 - .2 on the meter and sometimes you don't. And you would never hear that little of a difference by ear...

in my case as related to this thread you probably wouldn't want to hear it by ear cuz it sounds like garbage! box/wall is tuned to 60Hz 10 cuhes with a 220sq" port

[ciaonzo]

I don't bother thinking I build, test, and learn from that. Too many scientifice principles that make sense on paper, but don't transfer over to the real world when it comes to car audio.

Touching upon surface roughness I've done bare birch boxes and some coated with resin and sanded up to 1500grit and waxed. Sometimes you gain .1 - .2 on the meter and sometimes you don't. And you would never hear that little of a difference by ear...

Yeah, I hear you. Trial and error is king. Myself, I probably wouldn't bother with much other than some sanding and a coat of resin inside for my applications. The glass in the corners is a great idea, too. Might try that next time.

[mlstrass]

Yeah, I hear you. Trial and error is king. Myself, I probably wouldn't bother with much other than some sanding and a coat of resin inside for my applications. The glass in the corners is a great idea, too. Might try that next time.

No reason to glass corners. If I wanted strength I'd add a small 45 wood glued in place. Of course that can help or hurt score also, but again nothing you'd hear...

[mlstrass]

in my case as related to this thread you probably wouldn't want to hear it by ear cuz it sounds like garbage! box/wall is tuned to 60Hz 10 cuhes with a 220sq" port

Ugh, I prefer loud musical set ups. I've played music with boxes/walls tuned around 42-43Hz and they still sounded fine. Not sure about 60Hz though....

[akadj]

Ugh, I prefer loud musical set ups. I've played music with boxes/walls tuned around 42-43Hz and they still sounded fine. Not sure about 60Hz though....

yeah this car is set up for spl only.. not daily driver.. and adding the resin is not for construction strength to keep the box together. . its glued, screwed, double layer wood, and has threaded steel rod for bracing.