Sub box question

[wagonb0y]

Im planing on making a sub box to fill the whole end of my wagon, not in a big square but slopped ect, im plannng on 2 12" Audiobahn subs, with a bis this big will it make any differnce in the bass ect?
thanks

[1991_Vn2nV]

Yeah it will, you should follow the manufacturers specifications for box dimensions, a box that big wouldnt be great for the subs performance.

[garfa]

you could get a couple of free air subs (dont need a box, just a flat piece of wood to be bolted to) and have that instead.

[StoneX]

You can make the box that big, but have internal walls so the volume the subs are mounted in is what the manufacturer recommends.

[grafxworld]

that box would sound like crap, follow the box recommendations from manufacture , or expect crap sound and blown woofers from just building a box huge. or go to the place you bought them and ask for some box plans
surf the web there are heaps of box building software for free

[StoneX]

Do any of you guys actually know what a large sealed box sounds like?

If it is a decent sub it actually sounds more natural and gives more low end frequency response, but it reduces power mechanical handling. Most manufacturers recommend a smaller box than what will sound good because being able to use a sdmaller enclosure is a selling point, like power ratings... They exagerate to sell products.

But as I said above, the box can be as big as you want, just put internal walls inside the box to make an enclosure the right size for the speaker.

[SweetWagon]

Get ready for those rattles...

[wagonb0y]

Do any of you guys actually know what a large sealed box sounds like?

If it is a decent sub it actually sounds more natural and gives more low end frequency response, but it reduces power mechanical handling. Most manufacturers recommend a smaller box than what will sound good because being able to use a sdmaller enclosure is a selling point, like power ratings... They exagerate to sell products.

But as I said above, the box can be as big as you want, just put internal walls inside the box to make an enclosure the right size for the speaker.

That sounds the best idea, ive got all new door seals to replace just incase doors or boot door get the rattels, thanks heaps for replying to my question.

[grafxworld]

Stone x , I know exactly how it sounds using a huge box , crap
working in the car audio industry for close to 20 years I can say that without thinking twice.can you say the same for your experience?

your right it can give natural sound at very,very low volumes
they recommend box sizes for people so they dont blow the woofers up, in the old days they wouldn't give you the box size at all , told you to seek a car audio designer to make you a proper box for the woofer using software.
also to give you the best results for the home installer without elaborate box design and construction..

why would you make your car heavier than it needs to be ? just so the box takes the whole boot ? stupid,,, I would think and a possible hazard , I know my stock VT brakes can barely stop the car with my audio gear in it and I try to keep it light by using exotic construction methods.
the cars a heavy bastard compared to my skyline


free air subs would sound ok in a very large box with bracing (notice the QTS figures compared to sealed box or port subs)

(side note)
If you made it too heavy you might be up for defect, your car suspension might bottom out if tested with a full load and the insurance might not cover you in accident if rear end heavy with stereo boxes, everyone has heard how crappy the insurance companies in OZ are whe it comes to covering you in an accident

[StoneX]

Stone x , I know exactly how it sounds using a huge box , crap
working in the car audio industry for close to 20 years I can say that without thinking twice.can you say the same for your experience?

Oh god... Another person who talks up how long they've been in the industry. Why is it that you guys think saying that you've been in the industry for X years will help your point? My short 6 years is not worthy
I know from listening myself that large boxes don't sound "crap" with a decent sub. Obviously the proper sized box will sound better and that's what I told him to use

[lieos]

ummm has the car audio industry really been around for that many yrs

[garfa]

and i have not been in the industry at all, but i know that different people have different opinions and that certain chartarists to some sound bad yet toothers can sound natural.
some how i think this is pretty rich coming from short tempered me but......

[ascension24]

Big box, small box, ported, sealed, sub specs, actuall measurements of box.

There are too many factors that havnt been mentioned to work out what exactly it would sound like.

If you are asking a question like this, then you obviously dont have enough experience to start messing with box sizes. Just build the box to the manufacturers recommendations as it will give you the best performance.

In general, a bigger box means the sub can move more freely.
Think of the air in the box as a spring, like suspension.

If the sub can move more freely, you will obviously get louder sounds, but because their is less spring for the sub it will be less controlled, therefore sound worse.

This is some basic stuff.

[garfa]

true, but certain factors drastically change the sounds charastics. and this is what the disagreement is on.

[ascension24]

Yes very true.

To help the poor guy out, make sure the box is built to the standards. No ifs or buts unless you want sub par quality.

If it says to build a 40L box for the sub, make a 40L box, no ifs or butts.

Make sure it is completly sealed, as any leak can dramatically decrease sound quality.

The box can pretty much be any shape, make a pyrmaid if you want, its the volume that counts.

[SoulGrind]

StoneX
But as I said above, the box can be as big as you want, just put internal walls inside the box to make an enclosure the right size for the speaker.

Building boxes come down to a lot of things, NOT size. It depends on the subs
QTS(total Q of the speaker)
QES (speaker electrical Q)
FS (free air response in Hz)
VAS (Volume of air equal to the speakers spring characteristics in liters),


also depends on if u want it ported or sealed etc. Then u have to go through the power response curve with the Xmas, Pmax, and Diameter of the driver.

Box shape doesn't matter as ascension24 said. It comes down to how many litres the sub will require to sound perfect (or as good as the sub can get)

sorry, anyone who says any box size will do, the bigger the better knows next to nothing about audio design.. (installing speakers isn't designing them)

[StoneX]

Why are quoting me? What you quoted says to use the correct size box for the sub... Which is basically what you said.

I know about Thiele-Small parameters as i've been designing and building sub boxes for a few years now, so there's no need to try to explain them to me

Obviously the right volume enclosure will sound the best, I just don't believe the larger sounds "crap". It doesn't sound as good, but not "crap".

[SoulGrind]

Why say the box can be as big as u want, as long as the internal walls are correct for the enclosure to suit the right speakers? It's a contradiction. If you were to say, the box can be the size u want, as long as you know you'll lose quality then that’s ok.
The box can't be as big as u want. If u want to make it the right size for the speaker/s, with or without internal walls. The total box size will depend on speaker specs.

[garfa]

soul- i think they are arguing over how the sound will be largely effected by box size.
probably best if everyone stops and just leaves this as a mute point.

[Keesh]

Do any of you guys actually know what a large sealed box sounds like?

If it is a decent sub it actually sounds more natural and gives more low end frequency response, but it reduces power mechanical handling. Most manufacturers recommend a smaller box than what will sound good because being able to use a sdmaller enclosure is a selling point, like power ratings... They exagerate to sell products.

But as I said above, the box can be as big as you want, just put internal walls inside the box to make an enclosure the right size for the speaker.

if thats the case u put that insulating stuff into the RECOMMENDED size box so that the sub behaves like its in a bigger box.. then if u shold hav problems take the insulation out.. my mate has blown a 15" and a 12" and blew his amp from the sub shorting out ALL because ov the wrong size box.. the wanka at autobarn sais the manerfacturers recomendation didnt mean shit.. but we showed him when we bought it back 3 days later

[Keesh]

yer y fight for.. mine is a double box, ported and is slightely larger than the recommended size for my sonys, only just.. not talking about crazy figures here! um yer mine are like stoneX said, more booming bass, its less punchy which is good because ur speakers can do that, but yer im sure pioneer, sony, kenwood etc. have done at least a little bit ov research into what suits them the bast so i always prefer to play it safe.. i no peple that have built ful length wagon boxes but its all about the volume.. just do the maths

[StoneX]

Why say the box can be as big as u want, as long as the internal walls are correct for the enclosure to suit the right speakers? It's a contradiction. If you were to say, the box can be the size u want, as long as you know you'll lose quality then that’s ok.
The box can't be as big as u want. If u want to make it the right size for the speaker/s, with or without internal walls. The total box size will depend on speaker specs.

You're not understanding what i'm writing, so i'll clarify it... The outside of the box can be as big as you want (refer to original question), just put internal walls so the sub is in the correct size enclosure. Does that make sense to you now? If it doesn't, please don't bother replying


Keesh... The only ways the sub could short out the amp is if the coil burnt, which is caused by the user overdriving the sub with too much power, OR the voice coil and former hit the back plate (this would sound like loud clunking, quite hard to miss) of the motor resulting in a short, which is due to the user running the speaker too hard aswell. Yeah, the large box would have make the speaker need less power to move but it doesn't effect the thermal power handling. You can't blame the box for a damaged sub, it's the users fault for over driving it.

[SoulGrind]

That makes total sense.. I'm sure everyone does that.. Great way to waste space..

[Keesh]

^^ his point was u can make the box so that it goes all the way across the back, or to fit in a certain space u want, but make the inner walls the correct volume for the sub.. my mate ryan did it in the back ov his wagon, it beats having the sub roll around in the back

[SoulGrind]

I understand why you would do it, I’ve just never seen it done.
Seems stupid to add all that weight into the car, I've got a mate that has a wagon with 2 12inch subs, The box is big and heavy enough not to need it go across the entire wagon rear. You simply shape one side to the rear seat and use Velcro across the bottom of the Sub box.