[low_bass_makker]

I use the db meter to design my woofer box because u cannot be satisified by the performance of one box only. In my car the box sound different and In the room it sound different. That made me make 6 different boxes and asked all my friend to listen and vote the best box . I also us the db meter to measure the sound level of a audio system.

Ya by measuring the sound at diff freq by tone genrater i use it to tune my system.

My friend got it for me I will let u know from where did he found the sound meter.

[Alpha]

Dear Lbm
The Db you are getting 131db @ how many hertz ?
My dear friend db is to measured @ hertz i.e say 120 db @ 40 hz
which means the system produces 120 db at 1 meter on 40 hz of pure sine wave
the lower the hertz the most diificult to obtain higher db
check your system db on pure sine wave @ 40 hz or 30 may be even lower you will get amazed your same system (which touches above 130!) may not touch 120db also it is the TRUE TEST of your whole system. (you can easily make sine wave on any audio wave generator software available on internet, please search)
and please do note, dont ever make the length of sine wave for more than 8 seconds (5 sec is fine) as it can damage the subwoofers permanently and always give rest to sub after a single test.

[low_bass_makker]

Sir where do u live in delhi ?

U have TS-W126C and it need 1.25 cuft seal and for ported it is 1.65 cuft I think u must be knowing that

I use the following website for finding the encolsure volume.

http://www.the12volt.com/caraudio/boxcalcs.asp

[low_bass_makker]

First I am getting 131 db in a song not at test tone but proimse i will check it out tomm it self. Second I measured the db at my front seat of my car not at one meter from the sub because in the car the sub will sound different than in a room. What u said is right that lower the freq difficult to produce it. I have used a tone genrater to make the test (nchtone). And I know that play at loud volumes with these test tone can be dangerous to the sub thats why i had totaled near 3 sub of my friends car. I warned him before playing the track.
Rest here is a graph which I had made of four diff setting to check the diff




I am hitting near 124db at 40 hz and from 2 meter from the sub

[gunbir]

Originally Posted by muni

Just got curious about the type of systems the movie theatres use i.e, the drivers, The amps , decoders and wiring. How loud can a typical gud quality movie theatre go.

Muni... good question, OT in an ICE forum though...

Internationally the max SPL for theater is standardised at 86dB for films. Advertisements and trailers tend to play louder.

[panky12345]

thanx LBM. i am at rohini.
i was looking for an online resource to build my OWN ported boxes.....instead of shelling out 2K + on just one of them.

[panky12345]

i mean a step by step guide....

[navin]

LBM, Please make that photo small enough so that we dont have to scroll horizontally.

[low_bass_makker]

http://www.diysubwoofers.org/

u will find many things in this site about subwoofers

[low_bass_makker]

ok Sir this will not happen again

[aZa]

Heyyyy

i have that debonair system installed, my installer said it was some local guys making it. Is it really the "Debonair Magazine" guys ?

and the BASS is LOUD AND THICK !! No complaints in that department

[rsjaurr]

Originally Posted by panky12345

thanx LBM. i am at rohini.
i was looking for an online resource to build my OWN ported boxes.....instead of shelling out 2K + on just one of them.

panky,try
www.ehow.com/how_4073_build-subwoofer-box.html
www.crutchfieldadvisor.com/ISEO-rgbtcspd/ reviews/20030701/build_box.html www.termpro.com/articles/buildbox.html
[COLOR=#008000]www.caraudiohelp.com/building_subwoofer_boxes/ building_subwoofer_boxes.htm[/COLOR]

for more just google it by typing how to build subwoofer box.


Use 3/4" MDF [Nuwud is good brand].

Easier way is to ask a pro to build it for u,use good amount of resin/glue/sealant and pay him few bucks extra.Use good carpet to cover it and foam gasket between subw and box.

[panky12345]

i think these are all for SEALED and NOT ported ones....i need to make a PORTED one. any inputs plzzzzzzzz.....

[rsjaurr]

Originally Posted by panky12345

i think these are all for SEALED and NOT ported ones....i need to make a PORTED one. any inputs plzzzzzzzz.....

come on panky,u still can do it.
Navin,this is precisely what we were discussing few days back.

Panky u realy need step by step guide.Anyway here i go......

1.If u know what subw u have,then open its manul or find it from net by googling.
2.See in manual what type of box it recommends [sealed/ported].Manual must have its size/volume also e.g.1cu feet usually for sealed and 1.5-2 cu feet for ported.
3.It should also have dimensions of box e.g.WxBxL is 17x5x10 in inches.
4.If not step3 then go back to step2 and try to calculate dimensions ur self if u know the volume.If u cant do it urself we r always here.
5.manul should also have length/diameter of port and size of hole on box.
6.Ask JB if they can provide u with port from audison/AZ.

Rest,refer those websites....

[navin]

Originally Posted by panky12345

can u plz lemme know some online resource to build my own ported box!

you posted on the wrong thread