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How much better is ported?

 

Silver Member
Username: Dominirica012

Charlotte, North Carolina US

Post Number: 254
Registered: May-05
i know alot of people ask about ported vs. sealed but i was wondering if for a MTX 9500 would going through all the trouble of making a ported box be worth it..im going for spl and im asking if i made the box ported would the 3db rise in spl be really nocitable?
 

Silver Member
Username: Tbolt

Collipark, GA

Post Number: 136
Registered: Dec-04
yes, 3 db is like doubling the sound output
 

s2000
Unregistered guest
so in a banpass box where you could get 12 to 6 db gain is it not tripling out put?? i dont know just asking?
 

Silver Member
Username: Tbolt

Collipark, GA

Post Number: 137
Registered: Dec-04
if you tune it correctly yes it is possible, but it will be over a small frequency range.
 

Silver Member
Username: Dominirica012

Charlotte, North Carolina US

Post Number: 255
Registered: May-05
3db is like dbl sound output? wtf ima have to stop being lazy and go ported lol
 

Gold Member
Username: Glasswolf

Wisteria, Lane USA

Post Number: 7922
Registered: Dec-03
no, +3dB is equal to twice the power, but not twice the audible volume.
+6 to +10dB is roughly equal to twice the audible volume.
you will however see a big difference going to a ported box, which is what you really want to know, and yes it's worth the hassle to do it.
I prefer ported boxes in cars for most typical applications, and for SPL, you're looking at +3 to +5dB gain if the box is tuned well and made with adequate volume, positioned right, powered well, etc..

it'll sound better with that sub too.. looking at it's QTS and EBP.

If you want this for daily use and music, avoid bandpass enclosures. While you can get a lot more gain from one, they are larger, and usually tuned too high to sound that good. They don't hit very deeply, just louder. The ported box will give a more musical response.
 

Gold Member
Username: Taylor17

Kopperl, Texas

Post Number: 2483
Registered: Jan-05
How do you tell if you're sub will do better in a ported box?
 

Gold Member
Username: Taylor17

Kopperl, Texas

Post Number: 2484
Registered: Jan-05
Like the QTS... I don't think my subs specs said anything like that.
 

Gold Member
Username: Glasswolf

Wisteria, Lane USA

Post Number: 7926
Registered: Dec-03
Efficiency Bandwidth Product (EBP)
EBP = Fs / Qes
50 or less = best used in a sealed enclosure.
50 - 90 = flexible enclosure options.
90 or greater = best used in ported enclosure.
-OR-
Qts < 0.30 - ported
Qts = 0.30 - 0.50, use ported or sealed.
Qts > 0.50 sealed

 

Gold Member
Username: Taylor17

Kopperl, Texas

Post Number: 2485
Registered: Jan-05
Thanks.
 

Silver Member
Username: Dominirica012

Charlotte, North Carolina US

Post Number: 257
Registered: May-05
were can ig et the rest fo the stats for the 9500 so i can put it in the box design thing...the website doesnt state all of them
 

Gold Member
Username: Glasswolf

Wisteria, Lane USA

Post Number: 7944
Registered: Dec-03
email mtx and ask them for the full t/s specs.
that should work, or xerox a copy of the spec sheet at an mtx dealer
 

Silver Member
Username: Dominirica012

Charlotte, North Carolina US

Post Number: 262
Registered: May-05
ight thx glasswolf
 

Bronze Member
Username: Letto

Milwaukee, WI

Post Number: 70
Registered: Jun-05
Ok, so my subs have a Fs of 26 Hz, and a Qts of .35

This kind of conflicts with what you said glasswolf, 26 Hz for Fs would = a sealed enclosure, .35 Qts would = either/or, but more on the ported side.

I'm going sealed for now, you think I should go ported? Or stick with the sealed?

I have 2 IDQ10D4 V.2's.

Thanks
 

Bronze Member
Username: Letto

Milwaukee, WI

Post Number: 71
Registered: Jun-05
Wait.. EBP = Fs/Qes which = 69.5 for my subs... I guess that's in the ported/sealed range too, but this is more towards the sealed side.
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