Ok, question for all those Audiophiles out there. I am planning on making a bass tube using Sono tube and MDF rings. I want to put a sub at each end the tube. So here's the question, is it safe to assume if I left this box sealed the subs would bottom out or blow quickly? If so, how would you recommend porting it? I am also thinking of having a single active sub at one end, then a Passive Radiator at the other. Any input would be a great help. Thanks.

 

I like sealed better depends what you like.They won't bottom out if the air space is right and the power is also right Why do you want a bass tube why not just build a box it looks better.And will fit better in the space.

 

I don't have the space or the tools to make a "box" really (apartment). Also since i'm on a rather tight budget, i'm opting for this tube design. The materials are pretty basic, rather cheap to obtain and easily accessable. I can get all the materials for it for about $50.

 

if u want the tube, i would put something in the middle to divide them and ported will make it beat alot harder then havin it completly sealed

 

would putting one sub and a Passive Radiator give me the same result as porting it?

 

i dont guess i know what a passive radiator is...but i know it doesnt matter how much u spend on a system if u dont have the right air space it wont sound right and the best sound quality comes from a ported box. Some people also like the bandpass boxes too because of the way they look but it would be pretty hard to get it to fit in our cars unless u build a custom box...let me know what u do

 

Tight budget or not, you can't beat a traditional rectangular mdf enclosure. If you do a search on eBay you can get get a decent carpeted enclosure for around $50 with shipping........just shop around.

http://cgi.ebay.com/ebaymotors/DUAL-...QQcmdZViewItem

 

you could try a free air setup w/ port optional

 

I might end up getting one on Ebay, but I don't like spending money on something without knowing the quality of the build. I used to have a baffle board in my 85 camaro but like everyone says, it's not sealed and does not allow your subs to work at there full potential (of course it was a quick install and didn't care much about the quality.) It will be a little while before I start the install, I want to do as much research as I can before making a decision. Thanks for all the input thus far, I appreciate the help. Keep it coming. Oh, a passive radiator is kinda like a sub without the voice coil or magnet and uses a bolt that you add/minus weight to to raise or lower the pressure needed to move the cone, I believe. Again, i'm still in the research stage, lol.

 

WTF apparently people didn't get what you were wanting to do here, a sono tube will work VERY well. I don't know about passive radiating it, a passive radiator is an awesome setup but I'm not sure how the phasing will work having it at the other end of a tube, it will basically be working out of phase from the sub. The good thing is if you decide to go that route and it doesn't work you can always seal up the end and add a port if you like. Don't be scared to run a sono tube, just be sure the tube you get is rigid enough for the task at hand. Out of curiosity what sub are you planning to install and what are you using for the tube body?

 

uh, I get it .....I've been playing with car audio since you were eight years old.

He made the statement that he didn't have the place to make a box because he lived in a apartment.

Since he mentioned the the cost of materials would have been around $50, I merely suggested that he could save the hassle by purchasing a pre-fabbed mdf enclosure for the exact cost of "building" a bass tube.

I know what I'm talking about and I "get" it....all done by in my little bitty back yard shop with my own two hands.

 

1991Camaro-

Riggidity won't be an issue, i'm gonna be using MDF rings on the ends and in the middle for strength. I haven't decided on what subs i want, like I said i'm in the research phase. I'm gonna be going to the local Car Audio shop on my day off to reasearch some subs.

85TransAm-

I literally have no space to work, my porch on the third floor of complex is a whopping 5x5 square, lol. I can't store anything in the apartment either with 2 small kids running around. Thanks for the suggestion though, I'm sure that once I get a house i'll be building a tru box.

 

a pssive radiator would probly be a bad idea, to get a passive radiator to sound right you need a perfectly sized box and/or baffleing in the box to keep them in phase.

 

I would pass on the passive radiator...

A solid divider between two woofers would technically sound better than 2 sharing the same enclosure...

Also, throw in some pillow stuffing, daycron, what ever...
Sound wavers preferr boxes with all different sides / angles / dimension to sound better... since you can't really change the shape of the tube, the sound material will help...

Adding a port would be a bit of a chore, unless you do one like SAS does... cut another piece of tube (a bit smaller one) and use it along the side as a tune port...

Give it a whirl, let us know what it sounds like

Rafael

 

if you're going to put a sub at each end, you def need to divide it, and when you hook them up, you might need to reverse the phase on one of them (meaning a +/- switch-a-roo) im not 100% on that though.

you're really gonna get better airspace and definition with a traditional box though.

 

A divider is not a definitive need, but it is recomended.
If you wire the subs out of phase you will lose bass, you will have one pushing, one pulling, effectively canceling each other out... you want both pushing... wire up corectly.