Newbie Question: How to calculate Cu.ft Enclosure?

[kenlimfornication]

erm...i only understand the 12" x 12" x 12 "...what bout the 10"x 14" x 18" where is that?

 

[Bert]

Hey.. thats my picture... the a-pilalrs are custom made on that car.

ken,

the 10*14*18 is an example of box size calucation... a totally square box, 12x12x12 = 1 cu ft but a 10x14x18 box is 1.4 cu ft....

 

[kenlimfornication]

ooh! thanks bert
so if i listen to ROCK songs...usually the bass drum sounds like TUB TUB and really fast rather than TOOMM TOOOM ...
does the size of a woofer effect this?and also the box? what can i do/

 

[appleyard]

Originally posted by kenlimfornication@Feb 15 2005, 20:47
ooh! thanks bert
so if i listen to ROCK songs...usually the bass drum sounds like TUB TUB and really fast rather than TOOMM TOOOM ...
does the size of a woofer effect this?and also the box? what can i do/

if you listen to rock song which has rapid bass then go for a pair of 8" or 10". A 10" subs can play those kind of bass better than a 12" or a 15". This is because the bigger the cone area, the slower they move.

Then you tuned it high (40-50 hz).

 

[icecube]

Originally posted by Bert@Feb 15 2005, 20:28
Hey.. thats my picture... the a-pilalrs are custom made on that car.

ken,

the 10*14*18 is an example of box size calucation... a totally square box, 12x12x12 = 1 cu ft but a 10x14x18 box is 1.4 cu ft....

opps.. didnt know it was ur picture, got it from some audio website.
where can i find ppl to customise it??? :D thanks

appleyard,
u say "Then you tuned it high (40-50 hz). " ...do u mean tune the power amp or ... i dun quite understand.... :(

 

[Yong_5290]

he mean tune the enclosure 2 40-50hz..

if u tune ur amp o sub 2 40-50hz...u wont have any thumping bass at all...if u wan thumping bass...mayb u set at 80hz o more

 

[xtorm]

Originally posted by icecube+Feb 15 2005, 00:37 -->

QUOTE (icecube @ Feb 15 2005, 00:37 )

--QuoteBegin-Yong_5290

@Feb 14 2005, 23:43 yup...subang perdana in shah alam...those pillar r custom made...i dun think can mount a 4" into a wira pillar...;P

lol.. then my kenari sure no hope already... :( [/b][/quote] kenari a pillar damn biglor........if u dar.put 6" therelor..kakakakakakakak

 

[Yong_5290]

eehh...kenari ar...play 4 way setup lah...hehehee

 

[mengz]

i gonna make my woofer enclosure in a few days time. im not sure whether to use 30hz(this is wat they gave at the woofer spec sheet) for the porting frequency. my enclosure will have 1.3cuft volume... any recommendation on wat porting frequency i shall use?45-60? coz im mostly into SPL but sometimes SPQL :P

thanks in advance

 

[Bert]

For ported boxes.. its recommended to go for 30+ hz... msot ppl port btw 33-35hz

As for A-pillars.. go to a reputable car shop n they can do it for you.. the jazz was done at KF Audio. ALso which website did you get the picture from?

 

[icecube]

Originally posted by Bert@Feb 16 2005, 09:01
For ported boxes.. its recommended to go for 30+ hz... msot ppl port btw 33-35hz

As for A-pillars.. go to a reputable car shop n they can do it for you.. the jazz was done at KF Audio. ALso which website did you get the picture from?

lol..... yea i remember its kfaudio i took the pic from.

i want to know , how to tune the enclosure to 30hz? need some kind of tools? or measurement for the port?

 

[Yong_5290]

tune by the port....

 

[icecube]

Originally posted by Yong_5290@Feb 16 2005, 19:11
tune by the port....

How u know its 30hz ? measure with wat? tune with wat? sorry totally noob in this thing... :(

 

[appleyard]

Originally posted by icecube+Feb 16 2005, 20:27 -->

QUOTE (icecube @ Feb 16 2005, 20:27 )

--QuoteBegin-Yong_5290

@Feb 16 2005, 19:11 tune by the port....

How u know its 30hz ? measure with wat? tune with wat? sorry totally noob in this thing... :( [/b][/quote] dont worry we all been there before. I also last time thought that to tune only from Xover only dont know box also need tuning. to tune it you need to use WinIsd. That program lets u to measure port lenght for tuning for a given size of an exclosure. I cant tell you how to use it here but you can find some tutorial on enclosure designing in the net. Yong was right. For a ported box, tune it from the port. But tuning is more than the port only, everything is taken into consideration like using MDF or other kind of wood, thickness of the wood (3/4' recommended), size of the enclosure etc. But basically the lower the frequency the longer the port. The size of the port also taken into consideration, the bigger it is, the longer it will be for a specific frequency. Ported box is more complex than what you see in the shop. Most of them dont even know about bass frequency thats why ported box has such a bad reputation. Ported enclosure is better than sealed in terms of SQ (if you know what are you doing) and much more loud than sealed.

 

[Yong_5290]

i think a big ported can go loud n low but a sealed has got tight bass

 

[appleyard]

hope this site helps.

http://www.bcae1.com/spboxad1.htm

 

[appleyard]

to have tight bass you need a subs that can deliver in SQ. sealed may help but after listened to a LA sub in a sealed enclosure and a Adire Brahma sub in a vented enclosure. Needless to say tight bass, Brahma won by 10 miles.

But then again I cant compare the result becuase Adire Brahma is a better sub than than those LA sub. So it depends with the sub and enclosure.

 

[icecube]

ooh by the length and size of the port... and also the sofware...
have to find some time to read up the material. thanks alot..... sifu appleyard!!
still got alot to learn...

 

[Yong_5290]

Originally posted by appleyard@Feb 16 2005, 22:18
to have tight bass you need a subs that can deliver in SQ. sealed may help but after listened to a LA sub in a sealed enclosure and a Adire Brahma sub in a vented enclosure. Needless to say tight bass, Brahma won by 10 miles.

But then again I cant compare the result becuase Adire Brahma is a better sub than than those LA sub. So it depends with the sub and enclosure.

hahaha...yup....cant compare a adire brahma wit tat LA sub lah... :D

 

[Bert]

The main reason why most people go for sealed boxes are very simple... It's much smaller!

Can you afford to have a 2 cuft box in your boot? How about 3-4 cuft? If you can then its good and you will need to port cuz ur car is big and need more bass but for a normal car (wira/waja sized) 1 sealed 12" will be enough bass for most people.