difference b/w windows up and down??

[snfsh79077 10+ year member]

ok so i have a single cab truck with two tens in a 3.8 cuft ported box. i have an indash db reader and experience close to an 8 db difference when i have the windows down. is this normal or what? the reason im asking is if i were to compete in a bass comp should i have the windows down? sounds like it defeats the purpose of pressure but its my results.

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[hoss 5,000+ posts]

your RTA isnt reading pressure, it is reading velocity, which is why it seems contradictory to what should be happening.

in a competition, often times they mandate whether or not your windows need to be up or down. also, its going to affect the score depending on where the mic is placed.

 

[RipDaJacka]

what kind of DB reader? and pics of stripper pole in bed of truck!!!.. I have a friend who has a 4db increase with windows down.. he once hit 133db sealed then 136db with windows down.. now his new setup does 142.5db windows up and 146.2DB with em down

 

[snfsh79077 10+ year member]

i have an epic-160 in the dash and with the windows up it will read as high as 133db but with the windows down ive seen numbers of 142dbs. how do i post regular size pictures? i tried to attachment thing and it will only allow sizes of 29kb.

 

[snfsh79077 10+ year member]

i uploaded a picture of it in my gallery

 

[Lakota 5,000+ posts]

Many trucks like outlaw, I know that mine does for sure. I lose pressure when the truck is sealed up.

 

[Lakota 5,000+ posts]

Many trucks like outlaw, I know that mine does for sure. I lose pressure when the truck is sealed up.