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Trevor Eaton avalanch 15 abc box roughly done

 

Gold Member
Username: Insearchofbass

Post Number: 2548
Registered: Jun-04
3.30 15 inch deep ports 4 of them 2.0 id ports 15 inches long 25.008 hz .12
1.10 15 inch deep ports 4 of them 2.0 id ports 15 inches long 43.315 hz .07
find the displacement for the sub (space taken up) and add that to chamber 1's gross volume
.14 roughly for 4 2 inch ports
.42 roughly for 12 2 inch ports

chamber 1 15.5 x 18.5 x 25= 4.14858217592
chamber 2 15.5 x 5.875 x 25 x=1.31745515046296

if the boxes demensions were along these lines how would it fit
 

Gold Member
Username: Insearchofbass

Post Number: 2549
Registered: Jun-04
this is internal measurements so add 1.5 to l w h
 

Gold Member
Username: Insearchofbass

Post Number: 2550
Registered: Jun-04
bump
 

Silver Member
Username: Tdeaton1021

Near Tampa, Florida USA

Post Number: 563
Registered: Sep-04
sean... you are my idol. i love you man lol... if i just read this 12 more times i;ll understand it and hopefully be able to put it to use!
 

Silver Member
Username: Tdeaton1021

Near Tampa, Florida USA

Post Number: 564
Registered: Sep-04
okay a few questions... your dimensions for the box go as follows... height, width, depth... correct???
and as for the other info....
"3.30 15 inch deep ports 4 of them 2.0 id ports 15 inches long 25.008 hz .12
1.10 15 inch deep ports 4 of them 2.0 id ports 15 inches long 43.315 hz .07 "
what are the 3.30 and 1.10?? and then im guessing ur saying that i use 4 ports in each chamber and 4 ports connecting the chamber... and have the ports 2 inch diameter.

".14 roughly for 4 2 inch ports
.42 roughly for 12 2 inch ports"
ur telling me the displacement of the ports right?

and what is gross volume... net volume is the volume subtracting the port volume and wood volume as well as speaker volume... right? so what is gross... with all of that stuff?
 

Silver Member
Username: Tdeaton1021

Near Tampa, Florida USA

Post Number: 565
Registered: Sep-04
how do you find out the tuning of the chambers? what program are u using or do you do all of it whit pen and paper.... because i try to see if it works on some program and the tuning is different than what you have.. but thats because of the ports combining the chambers change the tune over just one chamber with 4 2 in dia. ports right?
 

Bronze Member
Username: Basshd

Post Number: 62
Registered: May-05
Treat each chamber as a seperate enclosure, then it will be easier to find the tuning you need/want.
 

Silver Member
Username: Tdeaton1021

Near Tampa, Florida USA

Post Number: 572
Registered: Sep-04
the port connecting the chambers doesnt change the tuning... example... the tune of the first chamber with only the port to the outisde will be the same as the tune of the first chambrer with ports to the outside and to the other chamber???
 

Silver Member
Username: Tdeaton1021

Near Tampa, Florida USA

Post Number: 573
Registered: Sep-04
that first tsentence i wrote was a question lol... im not trying to tell u your wrong im just trying to understand
 

Bronze Member
Username: Basshd

Post Number: 64
Registered: May-05
Divide the connecting port/chamber in half to calculate the tuning for each "enclosure".
 

Gold Member
Username: Insearchofbass

Post Number: 2552
Registered: Jun-04
ok as i posted those measurements are rough demensions not exact but if you make the first chamber 3.30 cf for instance 15.5 x 15.5 x 25 you get 3.47.5839120370 cf. and your target volume was 3.10 but lets say the sub takes up .17cf then your back to 3.10 cf then if you take four two inch id pvc ports 15 inches long on winisd online version youll get my port tunes ....the extra cf in chamber one was because i didnt want to refigure at that moment so i added 3 inches to the width to give me room for the 4 ports to fit on the front board which 15.5 x 18.5 x 25 is 4.14858217592 cf so with that design id have to use internal bracing or something to take up some room or redesign to different demensions
 

Gold Member
Username: Insearchofbass

Post Number: 2553
Registered: Jun-04
opps that 3.10 cf should read 3.30 cf
 

Silver Member
Username: Tdeaton1021

Near Tampa, Florida USA

Post Number: 590
Registered: Sep-04
okay... so i know your not guarenteeing me this will work good but say for instance if i was going to give it a try... make the box to those specs and i will get those tunes? thats the most important thing to me.. to get those tunes because i dont want to accidently get a higher tune... and sean... about what u said about adding bracing to take up some room... if i didnt put bracing i would obviously have a larger volume... that would lower the tuning frequency right? because iom okay with that... or would it screw everything up?
 

Gold Member
Username: Insearchofbass

Post Number: 2573
Registered: Jun-04
i was not saying this is a done box im just asking if it was 15.5 h x 24.5 w x 25 deep internal and 17 h 26 wide and 26.5 deep external would it be too big for you
 

Silver Member
Username: Tdeaton1021

Near Tampa, Florida USA

Post Number: 594
Registered: Sep-04
oh... im in an escalade so i got 48inches wide. by 21inches high... and 26.5 inch depth is about the deepest id like to go... so were okay on that.
 

Gold Member
Username: Insearchofbass

Post Number: 2595
Registered: Jun-04
ok ill get to workin on that prob tomorrow then now that i know i have more room it makes things easier
 

Silver Member
Username: Tdeaton1021

Near Tampa, Florida USA

Post Number: 597
Registered: Sep-04
okay thats awesome.... man ur a fckin cool guy... thanks a ton....
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