Best way to cover that sub 30 hz range

[Omega5002]

well for 1 i ninjad you dude

for 2 with the lower bass it is mostly felt not heard so for the around 20hz (idk bout any higher) you could do a double sealed bandpass box or a couple of these:

http://www.parts-exp...FTOKEN=63602835

http://www.parts-exp...tnumber=299-028

Explain a double sealed bandpass, and I thought transducers were only really good for like a gaming or theater chair so you can feel the movie/game when sitting down.

[Kyblack76]

i cant help any with enclosure ideas...

But,...

At the OP - dude,... i must say,.. outta all the installs ive seen and or read (minus the few that are outta this world) i would like to sample yours my friend.... it just seems we like the same type of "motion" in our gear,.. and you are miles, and miles ahead, above and beyond me man.... i bid you good luck, and pray i run into you at a dinner or pub some where, some time..... will you please keep your BL up to date on the trials and such ??? sincerly.. good luck,.. and get it man...

[Robert8252]

Big box. 12-15per. Tune to 30-33. Im guessing youre not going to have enough power to really make sub 25hz audible. It's where I would start. Need the big box to go low and port just depends on how the sub acts in your car. Since you can probably get 2-3 boxes out of a sheet of wood I'd start with a practice box and one sub to see how it does. Big car so it's hard to know how it will act for me. I know my car too well but haven't done much in anything bigger.

[IH8PunkRok]

that is what is messing with my head

i want it to be audible

but i think a 120 at 30 hz would easily overpower my front stage

so all id really need is maybe a 110 at full volume. how hard could that be right?

[Craig28]

What about a low tuned 4th/6th order?

[IH8PunkRok]

What about a low tuned 4th/6th order?

they arent modeling up very well when compared to a standard ported box

i think im just going to start with a sealed box. see how i like it

adjust from there

id love to try IB but i really have no way of doing that

[Omega5002]

Another idea that's been popping up into my mind is a Passive Radiator design, even though I only really see it in Home Audio, and not in a car, but it's another idea.

[412 CVX]

You can use WinISD to get a frequency response graph for a box that you make. Getting down to 20 might be a bit difficult

those graphs are pointless. the frequency response will change drastically when you put it in the car.

[eltortuga94]

Now I have really no experience/knowledge with boxes other than sealed & ported so i could be a complete noob but I'll try to help, anyways would you be able to try an ABC/Double Tuned ported (not sure what the proper name is). Like have a standard ported but with two ports tuned to different frequencies? Maybe one be 23 & the other 46 since it has to play from 20-50hz.

[IH8PunkRok]

Now I have really no experience/knowledge with boxes other than sealed & ported so i could be a complete noob but I'll try to help, anyways would you be able to try an ABC/Double Tuned ported (not sure what the proper name is). Like have a standard ported but with two ports tuned to different frequencies? Maybe one be 23 & the other 46 since it has to play from 20-50hz.

theoretically (i will try and be easy with this explanation) doing this causes two unwanted outcomes

1. it takes the octaves of the tuning and causes them to destructively combine. ie two sharp drop offs at the tuning freqs

2. the ports are tuning the airspace, not the individual ports. so having one short and one long will only cause the actual tuning to be somewhere between the two but with a lot of destructive interference as noted in number 1