Earthquakes ported vs sealed

scampos1984 · 11-11-2009, 01:56 PM

Hi all,

Has anyone sealed the underseat boxes when installing the Earthquakes SWS-8?

All of you have mantained the original ported box?

Thanks in advance,

scampos1984 · 11-11-2009, 02:21 PM

For example I can read here that the ported box was kept, not made seal:

http://www.e90post.com/forums/showpo...0&postcount=33

VP Electricity · 11-11-2009, 11:03 PM

I would not do it. A woofer in a sealed box has to travel a lot farther to have the same output as a woofer in a properly vented enclosure. There isn't that much clearance under there.

TurboFan · 11-11-2009, 11:41 PM

Boxes and drivers are also designed differently for ported vs. sealed applications.

scampos1984 · 11-12-2009, 02:55 AM

I will open that hole and Dynamat all the way to the door, not just the box as I have right now.

AWM3 · 11-13-2009, 06:07 PM

I tried it three different ways - completely sealed, dynamatted, and open. Best result seemed to come from leaving the port open but stuffing the enclosure with dynamat. There are compromises to each one, but the dynamat with the port open seemed best to me. Also depends on your amp and any additional equalization you may be using. If you want a lot of response below 50 HZ, you will need to add a true subwoofer in the trunk. The underseat speakers are not subwoofers - they are mid bass drivers.

amlebede · 11-13-2009, 07:58 PM

Sealed --> flat response, less loud, takes up less space.
Ported --> peak [ported] response, louder, takes up more space.

VP Electricity · 11-13-2009, 08:45 PM

Ambelede, again you answer a question you don't understand. Unless you have measured the response, you have no idea if either of those is right. In actuality, neither of these statements is neccesarily accurate. A sealed box too small is usually misaligned with a upper peak and a too-high rolloff. A vented box done well has an extended flat response before rolloff. Either, with cabin gain taken into account, usually has a peakiness.

amlebede · 11-13-2009, 09:31 PM

Quote:

Originally Posted by VP Electricity

Ambelede, again you answer a question you don't understand. Unless you have measured the response, you have no idea if either of those is right. In actuality, neither of these statements is neccesarily accurate. A sealed box too small is usually misaligned with a upper peak and a too-high rolloff. A vented box done well has an extended flat response before rolloff. Either, with cabin gain taken into account, usually has a peakiness.

Sealed boxes tend to be far more forgiving than ported boxes though. Ported boxes have to be perfectly built. Also, I think that sealed boxes are more appropriate for an underseat subwoofer.

scampos1984 · 11-15-2009, 06:05 PM

Okay thanks guys, I will open them and see whether I prefer the new results.

11-11-2009, 01:56 PM	#1
scampos1984 Spaniard member 3 Rep 197 Posts Drives: E90 & E91 320d Join Date: May 2005 Location: Madrid, Spain iTrader: (0)	Earthquakes ported vs sealed Hi all, Has anyone sealed the underseat boxes when installing the Earthquakes SWS-8? All of you have mantained the original ported box? Thanks in advance,
	Appreciate 0 Tweet Quote

11-11-2009, 02:21 PM	#2
scampos1984 Spaniard member 3 Rep 197 Posts Drives: E90 & E91 320d Join Date: May 2005 Location: Madrid, Spain iTrader: (0)	For example I can read here that the ported box was kept, not made seal: http://www.e90post.com/forums/showpo...0&postcount=33
	Appreciate 0 Quote

11-11-2009, 11:03 PM	#3
VP Electricity Brigadier General 301 Rep 3,201 Posts Drives: F34 xDrive Join Date: Jan 2008 Location: portland oregon iTrader: (3)	I would not do it. A woofer in a sealed box has to travel a lot farther to have the same output as a woofer in a properly vented enclosure. There isn't that much clearance under there.
	Appreciate 0 Quote

11-11-2009, 11:41 PM	#4
TurboFan Ski bum 333 Rep 6,198 Posts Drives: sideways Join Date: Aug 2007 Location: Knee deep in the pow iTrader: (8)	Boxes and drivers are also designed differently for ported vs. sealed applications. __________________ 1999 e46 328i Ti Silver / Black[retired] 2007 e90 335xi Jet Black / Black[retired] 2011 e70 X5 35d Vermillion Red / Cinnamon 2011 e92 M3 LeMans / Fox Red extended
	Appreciate 0 Quote

11-12-2009, 02:55 AM	#5
scampos1984 Spaniard member 3 Rep 197 Posts Drives: E90 & E91 320d Join Date: May 2005 Location: Madrid, Spain iTrader: (0)	I will open that hole and Dynamat all the way to the door, not just the box as I have right now.
	Appreciate 0 Quote

11-13-2009, 06:07 PM	#6
AWM3 BMW Fan 11 Rep 553 Posts Drives: 2012 E92 M3, Alpine White Join Date: Apr 2008 Location: Georgia, USA iTrader: (0)	I tried it three different ways - completely sealed, dynamatted, and open. Best result seemed to come from leaving the port open but stuffing the enclosure with dynamat. There are compromises to each one, but the dynamat with the port open seemed best to me. Also depends on your amp and any additional equalization you may be using. If you want a lot of response below 50 HZ, you will need to add a true subwoofer in the trunk. The underseat speakers are not subwoofers - they are mid bass drivers.
	Appreciate 0 Quote

11-13-2009, 07:58 PM	#7
amlebede Guest 37 Rep 611 Posts Drives: 2006 BMW 330i Join Date: Apr 2009 Location: Chapel Hill, NC iTrader: (0)	Sealed --> flat response, less loud, takes up less space. Ported --> peak [ported] response, louder, takes up more space. __________________ 2006 Black BMW 330i, Black interior, ZSP, ZPP, Logic 7, Xenon, Ipod, Satellite Radio Preparation, Moonroof, 12'' 2 P2 subwoofers running on KAC-7204 amplifier, Hardwired Escort Passport 8500, Hardwired Garmin Nuvi 650 on Kuda Mount. tutor,math tutoring,math tutoring,test prep,tutoring jobs,tutoring blog
	Appreciate 0 Quote

11-13-2009, 08:45 PM	#8
VP Electricity Brigadier General 301 Rep 3,201 Posts Drives: F34 xDrive Join Date: Jan 2008 Location: portland oregon iTrader: (3)	Ambelede, again you answer a question you don't understand. Unless you have measured the response, you have no idea if either of those is right. In actuality, neither of these statements is neccesarily accurate. A sealed box too small is usually misaligned with a upper peak and a too-high rolloff. A vented box done well has an extended flat response before rolloff. Either, with cabin gain taken into account, usually has a peakiness.
	Appreciate 0 Quote

11-15-2009, 06:05 PM	#10
scampos1984 Spaniard member 3 Rep 197 Posts Drives: E90 & E91 320d Join Date: May 2005 Location: Madrid, Spain iTrader: (0)	Okay thanks guys, I will open them and see whether I prefer the new results.
	Appreciate 0 Quote