Bass reflex Subwoofer

[PaulGreatest]

So more better to try closed box?It's will power up nice bass too,right?)
I could install port at any time...if this will be not enough)

[Shadydave]

Originally Posted by PaulGreatest

So more better to try closed box?It's will power up nice bass too,right?)
I could install port at any time...if this will be not enough)

If you do go with that thinking "I could install port at any time..."
Then plan the port into the build and simply leave it out, at first.
.
Trying to fit a low tuned port into an existing sealed box is sometimes difficult if not just maddening.
.
A word to the wise is sufficient.
.
And, yes a sealed box can sound just fine especially if you can add some EQ.
I use a DBX 120A to add the EQ jazz to my sealed 12" pair of boxes if I really want to hear some thumping.
.
I had the boxes ported, but I thought they were too boomy with "single note boom syndrome".
I like them sealed much better, but I am feeding them 400W channel and can crank the low end if I want to listen in anger.

Dave

[PaulGreatest]

Originally Posted by Shadydave

If you do go with that thinking "I could install port at any time..."
Then plan the port into the build and simply leave it out, at first.
.
Trying to fit a low tuned port into an existing sealed box is sometimes difficult if not just maddening.
.
A word to the wise is sufficient.
.
And, yes a sealed box can sound just fine especially if you can add some EQ.
I use a DBX 120A to add the EQ jazz to my sealed 12" pair of boxes if I really want to hear some thumping.
.
I had the boxes ported, but I thought they were too boomy with "single note boom syndrome".
I like them sealed much better, but I am feeding them 400W channel and can crank the low end if I want to listen in anger.

Dave

So if I'll use 60L box (like ßart West-VL. said),it's will be nice?

[sreten]

Originally Posted by PaulGreatest

Hey!Guys by yours advice I purchased better than this sub....
I just bought Pioneer TS-W3002D4,(don't find this JBL in store)...
And now I need some of yours help...to make box for this sub
(vented box) So,there T\S parametrs
Fs-31.4
Qms-15.13
Qes-0.68
Qts-0.65
Vas-0.46 (13.03liters)
imp.-2 or 8 Ohm
sens.90dB
freq. resp. 20-150 Hz
thanks in advance!!

Hi,

If those specs are true a sealed and well stuffed 20L box is called for.
Not a lot of point going bigger sealed, vented is not good for Qts=0.65.

rgds, sreten.

[PaulGreatest]

Nice,with your's help I decided what I must choose!I choose sealed! So, need to calculate right dimensions of the box...I'll use MDF(20mm),the most better type of box is like this(I think so) (to fit better sedan)...Someone who have some experience in this,please help =)

[johnr66]

If the box has the volume you need and it fits your Toyota, then sure. Keep in mind that the speaker doesn't have to face forward and the further back you can place it in the car, the deeper and less boomy the bass. If you're going to use the Pioneer driver, I agree that it must be sealed or your going to need something over 60L. Personally, I'd go with a sealed box of around 28L.

[Richard Ellis]

With an EBP of 46 this driver can go both directions ported or sealed, doing the calculations I get 71.08 Liters sealed with a Qtc of .707


__________________________________________________ ___Rick.....

[johnr66]

Originally Posted by Richard Ellis

With an EBP of 46 this driver can go both directions ported or sealed, doing the calculations I get 71.08 Liters sealed with a Qtc of .707


__________________________________________________ ___Rick.....

Yes, that driver likes a big box thanks to the high Qts, but at 28L (~1cu ft), Qtc is .79 which is quite respectable. I don't think it is practical putting a large box in his car unless he wants no cargo room.

[PaulGreatest]

Do not want to sound impudent,but someone have drawing of such sub(28L or smt. about)?Thanks!

[johnr66]

Build a box that is 35 x 35 x 23 cm. These are internal measurements, so add some length for the thickness of the boards. If the overall size don't fit your car, you can shorten one dimension, but add to another so that the LxWxH=28000 cm (28L).