footballdad

I recently put a sealed downfiring centre console sub enclosure in my 05 Montana SV6. It sounds great from the front and back seats, but noticeably less punch when sitting in the middle row. WTF? I have heard that console enclosures are not ideal, but constant hauling of drums and baby stuff made it necessary. Any clarity and/or solution for this would be appreciated.

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BigRedGuy

iTrader: (11)

You are getting the dreaded "dead spot" most likely due to the close quarters....too close to the driver for the wave to develop before it gets to your ears and cancellation from the reflections off the walls of the vehicle and the windows.

If you move it back and forth (assuming you can) you will hear the spot move with it.....in the meantime just leave the kiddies there, you can tell Mom you're protecting their delicate little ears.....

HTH

footballdad

Thanks for the info. It sounds real good from the drivers seat, so i will probably leave it there.
Perfect, because my sons car seat is in the middle row.

Dukk

Sinemeup

For my PA system I own one JBL JRX 18, on 800 RMS (into a single voice coil)... if you stand beside it, you wouldn't even know it was there... I actually recently found a sheet I had printed years ago that showed in a table: Frequency, Length, 1/2 length and 1/4 length (looking at it now, there are numbers but nothing stating feet or meters) so assuming that it shows in feet 20hz : 56.35 (feet maybe) for the wave to carry out... 40 hz : 28.15 and so on... 80 hz: 14.09.

BigRedGuy

iTrader: (11)

Quote:
too close to the driver for the wave to develop before it gets to your ears


Quote:
and cancellation from the reflections off the walls of the vehicle and the windows


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OK, I'll take that as an invite to learn something new.....

Would the driver's radiating surface position and direction not factor into the perceived loudness of the sub at that close proximity??

I would have figured it works the same as the reflected waves from the rest of the interior surfaces.......

Feel free to correct me here Lord Dukk......

footballdad

So you guys figure it would be louder in the drivers seat if the sub was farther away from me?!? As it stands it is loudest in 1:front row(closest), 2:back row(farthest), 3:middle row. Wouldn't the two rows of seats the waves have to go through to get to my ears deaden the sound? That confuses the $#!t out of me
I like being confused, it means I am learning something. But if someone can explain how that works it would be great. Thanks for the help.

Dukk

Nothing wrong with what you are experiencing. The frequency response of the box is that same in all 3 spots. It should be loudest right beside you. It is slightly quieter in the back due to it both being farther away and having stuff in the way of the sound like seats. The reason it is quietest in the middle is cancellation. The speaker sends sound in all directions. The sound that bounces off the back of the van and then runs into the sound going forward from the box will cause a cancellation point based on the distance from the box to the back of the van.


BRG - you're right, it has everything to do with reflections. It has nothing to do with 'letting the wave develop' That doesn't happen.

BigRedGuy

iTrader: (11)

OK....I would have thought that the cancellation point locations were frequency dependent and that the location of the driver would be the starting point for determining exactly where they are.....higher frequencies could cause the point to be located closer to the surface of the driver.....

I'm gonna go think about this some more.....

I may only give myself a headache but it's something to think about while I'm working.....

Thx

footballdad

Thanks for your input guys. Educational as always. I can sell the dead spot to my wife as a planned safety precaution for my sons hearing, mine is already f@#$%d!