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lincolntc690
02-05-2009, 07:36 PM
would i benefit from front loading my btl? tell me how to make my sketch up a jpg ill show my idea. i seen 2 dd's with a nice etched plexi cover somewhere

what are the benefits

Immacomputer
02-05-2009, 07:41 PM
Increased power handling and output are two possible benefits. It might make the frequency response be a little peaky though.

lincolntc690
02-05-2009, 07:44 PM
how do i get skp files to jpg so i can up a pic?

thevic24
02-05-2009, 07:48 PM
i have a dd1508 that i just put a 1/4" plexi loading wall on. it just covers the driver and i have it about 1" above it. it did help with power handling a bit and it did add some punch.

lincolntc690
02-05-2009, 07:51 PM
is there a right way to determine the distance from the sub to the loading wall?

thevic24
02-05-2009, 08:24 PM
i just took a guess at mine and it seems to work good for me. the wall did help with feeding 1k+ to a dd1508 in a 1cuft box.

netzero
02-05-2009, 09:13 PM
What exactly is front loading? Is it just a sheet of wood/plexi a few inches off the subs?

unrated
02-05-2009, 10:37 PM
how do i get skp files to jpg so i can up a pic?

save the sketchup file in 2D

Immacomputer
02-06-2009, 12:20 AM
how do i get skp files to jpg so i can up a pic?

Hit the Print Screen button (next to F12) and then open MSpaint. Go to edit --> Paste and then save as a .jpg file. Then upload to a place like www.tinypic.com and then post it here.

The distance should be based around the total surface area of the air between the loading panel and the enclosure. This should be more than the Sd of the driver. For instance, lets take a 15" by 15" loading panel over a 12" sub with an Sd of 75in^2. The total surface area of the air mass would be 4*15"*h where h is the height off of enclosure. 4*15 = 45in. Now if we put the loading panel 3" off of the enclosure, the total surface area will be 3"*45" = 135in^2 which is more than the surface area of the driver so you should be safe. I would shoot between 1.25-2x the surface area of the drivers' Sd.

lincolntc690
02-06-2009, 05:58 PM
this is what i had, going off the idea it needed to be atleast as wide as the port

http://i307.photobucket.com/albums/nn285/lincolntc/btlboxusingfrontloading.jpg

lincolntc690
02-06-2009, 07:41 PM
pic added

lincolntc690
02-06-2009, 09:35 PM
up

netzero
02-06-2009, 11:33 PM
I would do what imma said, but cut the glass short, so it doesnt cover the panel.

Immacomputer
02-07-2009, 11:28 AM
It doesn't have to be wider than the port. You can cut it down smaller without any ill effects. You will notice bad effects when you don't allow for enough exit surface area. In your case, make sure the exit area is about 1.25-1.5 times the Sd plus port area.

lincolntc690
02-07-2009, 01:35 PM
thanks immacpu. im goin sub/port back and i want to minimize hatch rattle a little. thanks for all the help

snb778
02-07-2009, 01:52 PM
sry, new to this idea, but from the pics posted, how is that different than putting the sub 5" from the back door on an SUV

TwoEggCustoms
02-07-2009, 02:01 PM
sry, new to this idea, but from the pics posted, how is that different than putting the sub 5" from the back door on an SUV

its not unless u dont want ur suv door to jump arond all the time

snb778
02-07-2009, 02:28 PM
what's the general idea for doing this though? back pressure?? Isn't that what happens when you close all the doors?...and IF it is backpressure, why do people open their windows a little to gain output?

lincolntc690
02-07-2009, 05:47 PM
yes, back pressure, it is increased alot more this way, than with closing and sealing up, i first got interested in the idea when i noticed a difference in how long my dp 15 could take my 2500d, with the 'tarp" pulled over it in my jeep. it seemed like there was more air movement and i could run at a higher volume for a longer time.

i started looking into it......

snb778
02-07-2009, 08:21 PM
yes, back pressure, it is increased alot more this way, than with closing and sealing up, i first got interested in the idea when i noticed a difference in how long my dp 15 could take my 2500d, with the 'tarp" pulled over it in my jeep. it seemed like there was more air movement and i could run at a higher volume for a longer time.

i started looking into it......

so why isnt it suggested to put your sub close the the back door on SUV's?

lincolntc690
02-07-2009, 08:28 PM
sure is but i want to minimize the hatch rattle on my cherokee also, when i was sub up port back it was bad enough that my wiper motor is in the botom of my hatch now. so now im goin sub and port back....