your logic needed again.

Your logic needed AGAIN

In my years of car audio I have always found that subs firing towards the rear of the car hit louder with better impact than subs facing the cabin, (results with windows up or down vary) BUT……

Is there any rule of thumb or mathematical equation for corner/wall loading a subwoofer? (example 8” 2 inches away, 12” 3 inches away)

Or is it trial and trial.

Also if you use a vented box in a corner/wall load does the port have to face the corner /wall also? Or could you build a vented box with sub facing corner/wall loaded and vent facing 90 deg’ away or visa versa and have the same out come? I always was told and read to keep the vent 2 inches away from the sub for best results so that’s how I have always built them.

I hope this isn’t as a generic question as my last post and that I explained what I am asking well enough.

Also BL is force of motor correct? So is the higher the BL of a driver better?

BL = faster response?

Just trying to learn a bit more.

thanks

AKA menace to sobriety

-------------
ac delco am radio and sparkomatic 40 watt sound exploder

most of the time you can use the back door as a backsplash and for the pressure out a little more. if you face the port towards a wall then you are more than likely gonna get a little more sense of pressure out of your speaker. but you cant put the port too close to something because then it will just drownd out the freuency. im not to sure about the far apart idea. but i would think the farther apart they are the more surround sound you will have.

1: Each boundary within the wavelength being produced will add 3dB. If you are in a home theater, and you put a woofer in the middle of the wall, that is a 3dB increase. Free output! :) In the corner? 6dB.

In the car, I have seen what you describe happen MANY times, but I always hear FAR less of the lowest registers. In the car, you are so close to the subwoofer, and the cabin is so small, relative to the wavelengths being produced, that you don't need to do anything special. Cabin gain already does all the work for you. If you like it "boomy", which is what I always hear, then turn 'em into the corner. If you like your bass MUSICAL, then keep them as far as is practical from a cabin boundary.

Mostly, it is trial and error, though... Yes.

2: Your vent, no matter where it is, and this includes inside AND outside ends, should never be closer to a surface (cabinet wall) or the radiating diaphragm (the woofer) than one half of it's diameter - a 6" port? Leave 3" to any boundary. 4 inch port? 2 inches. Easy math, that one... Additionally, I always like my vents on the same plane as the woofer. They integrate better.

and C: BL is indeed the strength of the magnetic field in the voice coil gap. This translates to EFFICIENCY, not speed. Low voice coil inductance is the speed effector.

okay thank you micintosh and haemphyst!!

i have 05 dakota that im thinkin if doin a spl type set up. blow thru if you will. but not cut the truck up just go through the back window.

-------------
ac delco am radio and sparkomatic 40 watt sound exploder