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Old 10th December 2007, 18:45   #1096
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Originally Posted by amit_sound View Post
SQL from ported?? Wont a sealed do a better job for SQL.

Else it seems, you planning for loud SQ
Who said ported done not mean SQ ?

Anyways I am doing something new this time. Something part ported and some part sealed.
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Old 10th December 2007, 18:46   #1097
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Car upgrade? Yeh kya LBM paaji? Putting it in your new E Class?

But good choice. Because this would have caused your Swift to sag from behind.
Yaar E-class to karab karne ka man nahi kar raha hai.

That is for sure...
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Old 10th December 2007, 18:49   #1098
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Originally Posted by low_bass_makker View Post
Who said ported done not mean SQ ?
I am just saying that sealed offers better SQ than ported....Read it a lot of places as sealed enclosures offer better control over the woofers.

Quote:
Originally Posted by low_bass_makker View Post

Anyways I am doing something new this time. Something part ported and some part sealed.
Sound interesting!!
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Old 10th December 2007, 18:53   #1099
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Originally Posted by low_bass_makker View Post
Yaar E-class to karab karne ka man nahi kar raha hai.

That is for sure...
Mat yaar, mat kar.....for heaven sakes, it a Merc, and that too E Class.

Daya karo, us pey and just enjoy the luxury that it has to offer.
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Old 10th December 2007, 18:56   #1100
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Originally Posted by DerAlte View Post
Oye @iraghava, why don't you pay a visit to LBM's workshop tonight and write a sneak preview to relieve some pressure?
Arrey kyunki sirji I already know what's happening!! You wanna know too??

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If the car is the maroon Alto, then that's Harpreet (not Harbir)
Yes, my apologies. His name is Harprit.

Quote:
Originally Posted by Bass&Trouble View Post
Car upgrade? Yeh kya LBM paaji? Putting it in your new E Class?

But good choice. Because this would have caused your Swift to sag from behind.
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Old 10th December 2007, 19:03   #1101
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Originally Posted by amit_sound View Post
I am just saying that sealed offers better SQ than ported....Read it a lot of places as sealed enclosures offer better control over the woofers.
I don't agree here.

Many High end brands use a ported enclosure. Are they not meant for SQ ?
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Old 10th December 2007, 20:32   #1102
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The MDF is bought. This time I though of putting a 1 inch instead of the regular 0.75 inch. Will be posting the box building pics very soon.
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Old 10th December 2007, 20:44   #1103
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Quote:
Originally Posted by low_bass_makker View Post
Something part ported and some part sealed.
4th order band pass is half sealed half ported :-); Stuffed port (what I call aperiodic) and Transmission line offer alignments that are between sealed and ported. LBM there are quite a few alignments and/or box types that fit that description.

Quote:
Originally Posted by amit_sound View Post
I am just saying that sealed offers better SQ than ported....
It depends on theT/S specs of the drivers. Most high Qts drivers work better in the sealed or aperidoic (lossy sealed) box but if the specs suit a ported box the ported box can offer SQ too.

Quote:
Originally Posted by low_bass_makker View Post
The MDF is bought. This time I though of putting a 1 inch instead of the regular 0.75 inch..
keep in mind that heavier wood also stores more energy. what you are looking for is stiffness and not weight. I would use a laminate of MDF, FRP and Marine grade Ply. say 2 layers of 4mm MDF, 2 layers of 6mm ply and 2 layers of 3mm FRP = 26mm but heck of a lot stiffer and a bit lighter too.

another way to gain stiffness is to bend the wood a bit to prestreess it. Prestressed materials are stiffer than they unstrssed counterparts.

lastly if you are into carpentry you can build a matrixed box a la B&W.
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Old 10th December 2007, 20:49   #1104
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Mai keya LBM-pra-ji, are you by any chance making a higher-order (like bandpass) box with 2 subs, one in sealed and the other vented to outside (or something like that; Navin has a name for it)???

PS: Oops, didn't see Navin's post come in earlier; anyhow, that's what I was trying to get at!!!

Last edited by DerAlte : 10th December 2007 at 20:52.
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Old 10th December 2007, 20:53   #1105
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Originally Posted by DerAlte View Post
Mai keya LBM-pra-ji, are you by any chance making a higher-order (like bandpass) box with 2 subs, one in sealed and the other vented to outside (or something like that; Navin has a name for it)???!!!
6th order is when both parts are vented.
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Old 10th December 2007, 22:47   #1106
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Quote:
Originally Posted by navin View Post
4th order band pass is half sealed half ported :-); Stuffed port (what I call aperiodic) and Transmission line offer alignments that are between sealed and ported. LBM there are quite a few alignments and/or box types that fit that description.

It depends on theT/S specs of the drivers. Most high Qts drivers work better in the sealed or aperidoic (lossy sealed) box but if the specs suit a ported box the ported box can offer SQ too.

keep in mind that heavier wood also stores more energy. what you are looking for is stiffness and not weight. I would use a laminate of MDF, FRP and Marine grade Ply. say 2 layers of 4mm MDF, 2 layers of 6mm ply and 2 layers of 3mm FRP = 26mm but heck of a lot stiffer and a bit lighter too.

another way to gain stiffness is to bend the wood a bit to prestreess it. Prestressed materials are stiffer than they unstrssed counterparts.

lastly if you are into carpentry you can build a matrixed box a la B&W.
Ya sure but mine will be a plain ported or the bass-reflex one. For the bandpass or TL i would require bigger boot which I don't have.

4th order band pass..


6th order band pass




The driver is having QTS of less than .5 so I think it is good for ported.

Yes sir If the box is not stiff enough it will absorb the sound and the final output will be hampered. Also I am thinking of bracing the enclosure from inside to give added strength.


Quote:
Originally Posted by DerAlte View Post
Mai keya LBM-pra-ji, are you by any chance making a higher-order (like bandpass) box with 2 subs, one in sealed and the other vented to outside (or something like that; Navin has a name for it)???

PS: Oops, didn't see Navin's post come in earlier; anyhow, that's what I was trying to get at!!!
Nahi sir ji simple ported one right now.

Last edited by navin : 11th December 2007 at 09:53.
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Old 11th December 2007, 09:54   #1107
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Quote:
Originally Posted by low_bass_makker View Post
The driver is having QTS of less than .5 so I think it is good for ported..
what is the Qts and EBP ratio?

For ported I would think you would need Qts less than 0.35.
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Old 11th December 2007, 10:41   #1108
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Quote:
Originally Posted by navin View Post
what is the Qts and EBP ratio?

For ported I would think you would need Qts less than 0.35.
SubwooferTools.com [insert slogan here]

the Qts is .4 and the EBP is 48.7 And I think it is good enough for a ported box.
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Old 11th December 2007, 13:02   #1109
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Quote:
Originally Posted by low_bass_makker View Post
the Qts is .4 and the EBP is 48.7 And I think it is good enough for a ported box.
it is marginal for a ported box. I'd go with a sealed box with those specs.

I would prefer a low Qes (hence Qts) and higher EBP (70+) to consider ported. in fact most of the ported subs i have built had Qes (hence Qts) sub 0.3 and EBP greater than 100.

An old article for car audio subwoofers.
How to buy a Subwoofer
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Old 11th December 2007, 22:53   #1110
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Quote:
Originally Posted by navin View Post
it is marginal for a ported box. I'd go with a sealed box with those specs.

I would prefer a low Qes (hence Qts) and higher EBP (70+) to consider ported. in fact most of the ported subs i have built had Qes (hence Qts) sub 0.3 and EBP greater than 100.

An old article for car audio subwoofers.
How to buy a Subwoofer
Navin Ji my main priority is SQL so I think ported is the way to go. And wait for few day you will defiantly agree with me.
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