Correlation Between Vent Mach and SPL

[MikeMartel 64]

Iv been doing some research in advance of me competing next year. Although I will be doing a ton of testing on the termlab once I start building my setup, I wanted to get a starting point as it will obviously make things a bit easier. Basically my main question is going to be if anyone has actually tested the correlation between vent mach and spl readings. Iv been reading that best results come out of about a 0.05% vent mach in a build, but on the other hand you see high powered, high sd setups only using 8" aeroports that are putting up huge numbers. I may be over-thinking this, I'm just trying to grasp as many concepts as possible before I start testing so that I can make the best result possible with my build.

Thanks for the help in advance.

[Kangaroux 47]

It's hard to say there is a correlation because there are so many variables that go into it all. But to be clear you are asking about port velocity and not port noise, right? Like, asking if port noise effects your SPL?

Edited September 16, 2012 by Kangaroux

[MikeMartel 64]

Yes Im basically asking if there is a "optimal" port velocity in order to achieve maximum SPL. Obviously there are many many variables, but like I said, I just want a starting point, even if there is one. Not sure and this is why im asking.

[Duran 387]

Vehicle acoustics play a much more important role in SPL than anything, once you master the space in your vehicle the sky is the limit.

If you wish to venture in the physics behind how ports work, read this:

[shizzzon 461]

When doing just burping, make sure that trial and error tuning gets you the correct tuning. that's primary!

IF you can ensure that you can always achieve the best tuning, then use the largest port area you can.

I believe Gary Fletcher was using in excess of over 600sqin of port for just 2 18s in ~20cuft net on 2 sundown-1500s.

He achieved a 159.4db

[MikeMartel 64]

All good answers guys. Thank you so far.

[ssh 924]

If you have some time, you may also want to read this: http://resource.stefanhinote.com/f15aZ/soundwhitepapers/Maximizing-Performance-From-Loudspeaker-Ports.pdf along with the article Duran posted.

[MikeMartel 64]

Im glad that I never fully understand something the first time I read it, so Iv got to read these over and over again .

Edited September 16, 2012 by MikeMartel

[///M5 2,833]

If the behavior was linear and the same across all geometries and boundary conditions then of course monkies fly out of my ass.

[bassahaulic 155]

SPL is rarely taken to the point of figuring that stuff out.

Since there are so many variables.

[slim2fattycake 85]

If the behavior was linear and the same across all geometries and boundary conditions then of course monkies fly out of my ass.

YES. lol.