can anyone sife here? tell me? confuse o ... wanna know more bout this box i going to make a new sub box for my car any opinion will appreciate! oh ya.. i wish to play sq then spl just curious what the diff for the two box i mention? ;)
what the diff between sealed box sub and non sealed box??
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bro,i guess wat u meant was the sealed box n also the ported wan rite?
actually,its up to one's taste n the box enclosure maker.
for the sealed wan,normally they have a smaller size,lets say 1cubic ft n soso.Smaller enclosure will give a higher pressure in other word,it directly affect the type of sound produced.For the sealed,the sound is more bouncy n firm in fact. (the one u used to see without a hole)
for the ported,actually who said kenot be used for sq...even ported can go sq...but the enclosure of the sub must be well tuned..on top of that the enclosure must be custom made like those they called vented wan..the flexibility of the ported is very wide in fact..its ur tuning that matters too...(the one u used to see wit big lubang)
but theres a shop very experienced in sub box enclosure..its near the subang old airport,called "megasound" go there look for ah siang...
p/s : just my 2cents...
actually,its up to one's taste n the box enclosure maker.
for the sealed wan,normally they have a smaller size,lets say 1cubic ft n soso.Smaller enclosure will give a higher pressure in other word,it directly affect the type of sound produced.For the sealed,the sound is more bouncy n firm in fact. (the one u used to see without a hole)
for the ported,actually who said kenot be used for sq...even ported can go sq...but the enclosure of the sub must be well tuned..on top of that the enclosure must be custom made like those they called vented wan..the flexibility of the ported is very wide in fact..its ur tuning that matters too...(the one u used to see wit big lubang)
but theres a shop very experienced in sub box enclosure..its near the subang old airport,called "megasound" go there look for ah siang...
p/s : just my 2cents...
sealed box doesnt mean it have to be small. Ported box doesnt meant it has to be big. Its all depends on applications.
i remember the old tempest need at least 4.0cu. ft sealed. does that looks small?
i dont remember smaller box will give you higher preasure (or SPL), better check your basics. Larger box will increase subs efficientcy means lower power handling and higher SPL for ported.
ported = vented, they are the same.
i remember the old tempest need at least 4.0cu. ft sealed. does that looks small?
i dont remember smaller box will give you higher preasure (or SPL), better check your basics. Larger box will increase subs efficientcy means lower power handling and higher SPL for ported.
ported = vented, they are the same.
ported doesnt have to be in SPL. ported may sound better than sealed if you know what are you doing.
Sealed has better transient response but you sacrifice efficientcy.
ported can play low freq. better than sealed and isnt that is qhat SQ are looking for?
i think you should better do some reading before having conclusions.
Sealed has better transient response but you sacrifice efficientcy.
ported can play low freq. better than sealed and isnt that is qhat SQ are looking for?
i think you should better do some reading before having conclusions.
actually, there are not fixed rules, some manufacturers recommend ported box for their sub, some sealed... here r some extracts from an expert.. edited 4 shorter explanation.. hope it helps :)
Sealed
Basically as far as sealed is concerned, the relationship between the characterisitics of the speaker being used and the volume of air inside the enclosure dictates the how well the sub will sound. When the enclosure is bigger, the air spring limits cone motion less and allows the system to play lower and with flatter overall response (lower Qtc) at the expense of power handling. Problem is if you go too large you start to compromise efficiency in order to gain the additional low frequency extension. On the other hand, making the enclosure smaller will cause the air spring to exert more control and limits cone motion at low frequencies which increases power handling but does not let the system play as low and produces a more peaked response (higher Qtc).
Ported
Depending on the sound you desire, you tune a port to a certain frequency to achieve better bass response around that frequency. The tuning of the port there must be done using careful calculations which take into consideration the enclosure volume, the resonance of the port and the Thiele / Small parameters of the sub into consideration. Using these we attempt to delay the rear output wave of the speaker just enough so that when it comes out of the port it is close to being in phase with the wave being produced by the front of the sub. By altering the port length and diamter, we tuned the port to a certain frequency. The reason ported enclosures are generally considered louder is that when we utilise the work of the rear of the cone we gain double the bass, or 3dB over a broad range of frequencies.
Bandpass
With bandpass enclosures the woofer no longer plays directly into the listening area. Instead the entire output of the subwoofer system is produced through the port or series of ports. In a conventional sealed or ported enclosure the low-frequency extension is controlled by the interaction of the speaker and the enclosure design but the high frequency response is a result of the speaker's natural frequency response capability unless limited by a crossover. In a bandpass enclosure the front of the speaker fires into a chamber which is tuned by a port. This ported front chamber acts as a low-pass filter which acoustically limits the high frequency response of the subwoofer system. The name "bandpass" is really pretty descriptive in that it refers to the fact that the enclosure will only allow a certain frequency "band" to "pass" into the listening environment.
Sealed
Basically as far as sealed is concerned, the relationship between the characterisitics of the speaker being used and the volume of air inside the enclosure dictates the how well the sub will sound. When the enclosure is bigger, the air spring limits cone motion less and allows the system to play lower and with flatter overall response (lower Qtc) at the expense of power handling. Problem is if you go too large you start to compromise efficiency in order to gain the additional low frequency extension. On the other hand, making the enclosure smaller will cause the air spring to exert more control and limits cone motion at low frequencies which increases power handling but does not let the system play as low and produces a more peaked response (higher Qtc).
Ported
Depending on the sound you desire, you tune a port to a certain frequency to achieve better bass response around that frequency. The tuning of the port there must be done using careful calculations which take into consideration the enclosure volume, the resonance of the port and the Thiele / Small parameters of the sub into consideration. Using these we attempt to delay the rear output wave of the speaker just enough so that when it comes out of the port it is close to being in phase with the wave being produced by the front of the sub. By altering the port length and diamter, we tuned the port to a certain frequency. The reason ported enclosures are generally considered louder is that when we utilise the work of the rear of the cone we gain double the bass, or 3dB over a broad range of frequencies.
Bandpass
With bandpass enclosures the woofer no longer plays directly into the listening area. Instead the entire output of the subwoofer system is produced through the port or series of ports. In a conventional sealed or ported enclosure the low-frequency extension is controlled by the interaction of the speaker and the enclosure design but the high frequency response is a result of the speaker's natural frequency response capability unless limited by a crossover. In a bandpass enclosure the front of the speaker fires into a chamber which is tuned by a port. This ported front chamber acts as a low-pass filter which acoustically limits the high frequency response of the subwoofer system. The name "bandpass" is really pretty descriptive in that it refers to the fact that the enclosure will only allow a certain frequency "band" to "pass" into the listening environment.
Ahhh, here's another. The search for the absolute enclosure continues .... hehehe.
Jack, put it this way,if you want your bass to be accurate & loud, you'd go with sealed, reason is that it is very easy to build & the Qtc of sealed could be chosed easily. Vented will definitely give you louder bass at port tuning but the Q is not variable. Variations in the vented's Q would cause increment & decrement in bass which is also known as misalignment, which would cause the bass from the vented being too boomy. This is where usually the vented box falls short in favour for SQ. If you could get past all the trouble the vented can present you, yeah you could get great SQ from it why not.
You would also want to consider what kind of shape you want the enclosure to be, this is something a lot of ppl tend to overlook. I'll share with you the summation of enclosure shape variations.
Sphere : +- 0.5db
Beveled Cube : +-1.5db
Beveled Rectangle : +-1.5db
Rectangle : +-2db
Cube : +-5db
Stay away from cube shaped enclosure, in short, it'll give you too much standing waves, sure you could fill the enclosure, but you wouldn't want to overdamp it. Sphere shaped enclosure is definite,but it is very hard to construct, you could get it from Focal, they had manufactured an egg-shaped enclosure. But the easiest is to stick to beveled enclosure, or some would call it wedge. Be very sure to get a pro installer to do it for you, most of the shops out there knows nuts abt what they're doing.
Oh yeah, stay away from bandpass.
Jack, put it this way,if you want your bass to be accurate & loud, you'd go with sealed, reason is that it is very easy to build & the Qtc of sealed could be chosed easily. Vented will definitely give you louder bass at port tuning but the Q is not variable. Variations in the vented's Q would cause increment & decrement in bass which is also known as misalignment, which would cause the bass from the vented being too boomy. This is where usually the vented box falls short in favour for SQ. If you could get past all the trouble the vented can present you, yeah you could get great SQ from it why not.
You would also want to consider what kind of shape you want the enclosure to be, this is something a lot of ppl tend to overlook. I'll share with you the summation of enclosure shape variations.
Sphere : +- 0.5db
Beveled Cube : +-1.5db
Beveled Rectangle : +-1.5db
Rectangle : +-2db
Cube : +-5db
Stay away from cube shaped enclosure, in short, it'll give you too much standing waves, sure you could fill the enclosure, but you wouldn't want to overdamp it. Sphere shaped enclosure is definite,but it is very hard to construct, you could get it from Focal, they had manufactured an egg-shaped enclosure. But the easiest is to stick to beveled enclosure, or some would call it wedge. Be very sure to get a pro installer to do it for you, most of the shops out there knows nuts abt what they're doing.
Oh yeah, stay away from bandpass.
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sealed = no lubang
ported = got lubang (vary)
you can go ported, since you are in SQ then the port has to be desinged according to the sub. this you can get via the manual of the sub which will tell you the measurement you'll need for your box. to me I'd prefer to go ported (though currently I'm running sealed - yet to modify). Why I choose ported coz less power need to whack the sub so amp will last a little longer :p
what you can do is, go and listen to a setup with sealed box and then compare your taste with another setup with a ported box (the port tuned for SQ setup) and make your choice. I once believed in sealed until I met the right people who converted me to the dark side of the force ;) but then all these goes down to your own taste and feelings. In my experience sealed gives a tight feeling on the sub but not much ummph for my current setup (amp not power maaa... cap ayam only). Though ported is good, the control over it is where the fun starts.
So take your time, relax and enjoy your music. ;)
May the force be with you... ;)
ported = got lubang (vary)
you can go ported, since you are in SQ then the port has to be desinged according to the sub. this you can get via the manual of the sub which will tell you the measurement you'll need for your box. to me I'd prefer to go ported (though currently I'm running sealed - yet to modify). Why I choose ported coz less power need to whack the sub so amp will last a little longer :p
what you can do is, go and listen to a setup with sealed box and then compare your taste with another setup with a ported box (the port tuned for SQ setup) and make your choice. I once believed in sealed until I met the right people who converted me to the dark side of the force ;) but then all these goes down to your own taste and feelings. In my experience sealed gives a tight feeling on the sub but not much ummph for my current setup (amp not power maaa... cap ayam only). Though ported is good, the control over it is where the fun starts.
So take your time, relax and enjoy your music. ;)
May the force be with you... ;)
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