help me get loud please.

[sikcavy 10+ year member]

ok im gonna take thors advice. im gonna build me a box to 2.5 and seal everything but the back panel. i will be using 2x 4" ports and i will be using pvc piping as test runs. first test will be 2.5cubic feet tuned to 35. i will then cut the pvc with the port flares on them until i get loudest. then i will decrease box size by screwing pieces of mdf onto the back wall and putting it inside the box. i will then keep testing like this until i get the loudest combo and then cut the box to that and then use the real port tubing (to keep the nice black look). I should be all good after this. now the question is, should i keep tuning with the box i have now? or should i move onto the next box and scrap this one?

 

[thegreatestpenn 5,000+ posts]

remember, just putting mdf inside the enclosure might effect air flow. if the airflow is slowed, sound waves won't move as fast. slower waves may mean less spl.

 

[sikcavy 10+ year member]

no i will be doing it to the inside dimensions so that in the box it will be seamless pretty much just like moving the back wall inwards by adding thickness towards the inside of the box. pretty much cutting a board to the inside dimensions of the back wall and putting it in the box against the back wall. get what im saying?

 

[sikcavy 10+ year member]

ok so i had a spare box around that i have been testing with.. the box is 15"tall x 15" deep x 30" wide. i put the sub and ports on same side. the ports are measured at 11" from tip of flare to toe of flare.. net box volume after displacement is about 2.7 cubic feet. i peak at 41 with the box firing back and reach same score of 141. //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif im gonna start cutting the ports to see if any gains are available.. i will then start shrinking the box by cutting the back wall but i will also have to build neck like spacers for teh ports so that i can still have enough distance between end of port and back wall (from wall to wall is 15" right now.

 

[sikcavy 10+ year member]

first competition of the year and with my 100hc i hit 141.2 and with a Hifonics BXI2608D, i hit a 143.6 :/ lost to a guy with a rf 1000watt (dont know class) and a dc sub with an atomic motor which hit a 143.9. :/ i might go back to vents cause i dont think 2x 4" ports are cuttin it for this sub.

 

[Lakota 5,000+ posts]

There's a guy in MECA doing 150's at the headrest out of a Cavalier trunk. He has two Crossfire 10's and about 6kW.

 

[sikcavy 10+ year member]

link?

 

[Lakota 5,000+ posts]

Nope, I personally know him.

 

[thegreatestpenn 5,000+ posts]

i know who ur talking about......

u gotta learn your car. that's the only way to loud Deebeez

 

[sikcavy 10+ year member]

how do i go about doing that?

 

[mazdakid 5,000+ posts]

Everyone said to try a smaller box, but you went from 2.5 to 2.7?

 

[sikcavy 10+ year member]

no i went back down to 2.5 haha i got a different box. im gonna cut it down a little bit pretty soon to 2.25

 

[sikcavy 10+ year member]

ok so i cut my current box to 2.0 cubic feet outside demensions are the following. 30 inches wide X 15 inches tall X 11 inches deep. I have 2x 4" ports at 17" long tuned to around 40. Do you think having the sub that close to the wall is a killer? from wall to wall inside is 9.5 inches. i also have the sub and vents firing sideways instead of forward as the vents are quite long.

 

[sikcavy 10+ year member]

ok i got a 144.3 at 43hz.. any more ideas?