A 40 Hz sound wave is 28 foot long, any surface is "smooth" compared to it.what do you guys use to get the inside of your enclosures smooth? looking for extreme db's and wondering what the best material is.
MDF is a terrible material for subs. But I would say fiberglass resin is a good bet for interior smoothing. Having a sub that is designed and built for minimum flow losses will certainly maximize db's.
half a db is quite a bit when you're extracting all you can.
Exactly right.According to the link you posted, the 'spl gain' is 0.4dB. That's 0.1dB less than the reported value for folding the sun visors down.
All the 'spl gains' listed are of a magnitude that is easily reached by moving the probably cheap, non calibrated microphone when opening/closing the door. And probably well within measurement errors. I wouldn't be surprised if repeating a measurement without changing anything would yield gains or losses in the 1dB range.
Half a dB is barely noticeable to the human ear.
Yes, obviously it's an spl application..........that's a "thing" in car audio.
In car audio as 'a technical means to enjoy high quality music while driving in a car', there are "things", surely:
* good frequency response
* low distortion
The importance of SPL is somewhere down at 'sufficently loud, but not ear-damaging'.
For some dumb-*** car audio making rattling oomph-oomph-tzzz noises while passing by, there is only one thing:
Guess which one has a place in an audio forum....
anyways, thoughts on how to make an enclosure as smooth, and an non porous as possible?