|   Subwoofers.....sealed enclosures versus ported enclosures | Richard Greene
Feb 21, 2002 4:13 PM | | The link below has a comparison of a high quality subwoofer driver in a sealed enclosure versus the same driver in a ported enclosure (both enclosures are the same size). People sometimes say a ported subwoofer has 3dB more output than a sealed subwoofer. It's not that simple. The chart at the web site below explains the difference at a glance.
http://deonspace.stryke.com/
click on the words "sealed versus ported" |
| re: Very interesting stuff... | Woochifer
Feb 21, 2002 5:04 PM | | Just from looking at the charts, it seems that the rolloff on the sealed subwoofer is more gradual, while the ported enclosure is "peakier". I'm kinda going thru my own dilemma with subs. Growing up, I was more partial to the bass on acoustic suspension designs with main speakers. Nowadays, it seems that the ported designs have improved and pretty much displaced the sealed designs. But, the idea of going with a sealed enclosure sub does sound appealing. I guess my crystal ball shows an Adire Rava in the future? |
| Fb is what ?? | 3db
Feb 22, 2002 9:45 AM | | |
| Definition of Fb | Richard Greene
Feb 22, 2002 1:16 PM | | Ported box:
Fb = box (port) tuning frequency in Hz.
Sealed box:
Fb = box resonant frequency in Hz.
Fb = Qr x Fs
Qr = Qtc/Qts
Qtc = total Q of the system (driver plus box)
Qts = total Q of the driver
Fs = resonance frequency of the driver in Hz.
Q = nobody actually knows what "Q" is but not one
speaker builder in the world will ever admit it! |
| Why I like sealed systems, and hate ported ones | Terrible Terrence
Feb 22, 2002 9:50 AM | | Hey Boss, isn't port wine? hehehehe I believe you said that to me once and now back at ya!
Why I like sealed subwoofer designs.
1. They don't overload as easy during high levels of deep bass.
2. Because of #1 you can use eq to extend the deep bass extension.
3. Transient response is usually better.
4. The have a slower roll off below their tuning point.
5. Bass seems tighter, and more detailed than with ported systems.
Why I dislike ported systems:
1. The overload easy during high levels of low bass.
2. Transient response is terrible.
3. They are more prone to ringing.
4. Its not smart to use eq to extend the low bass extension.
5. The bass quantity is there, the bass quality is not.
6. Only heard 2 ported subs that I have ever liked. SVS, and HSU subs.
I say all of this and realized that the subwoofer I most recommend to my clients is a ported design. The SVS line of subs. Oh well....
Terrence |
| Why I like sealed systems, and hate ported ones | yawn
Feb 22, 2002 12:11 PM | | What would be your recommendations for sealed subs ? |
| The only ones I could truly recommend.... | Terrible Terrence
Feb 22, 2002 2:24 PM | | Are DIY jobbers that a friend of mine designed for my post studio. DAMN good subs he makes, damn good. The only one by a major manufacturer that I heard that sounded really good was the subwoofers by Revel. They cost big bucks however.
Terrence |
| Wonder why that is | Bryan
Feb 22, 2002 12:16 PM | | Could it be cylinder versus box that makes a difference? ;^) (Don't want to get into a debate here.) |
| Why I like port | Richard Greene
Feb 22, 2002 1:23 PM | | I place (hiccup) bottles of port
in all my DIY (hiccup) sealed box
subwoofers so they can age properly.
The port, that is, not the subwoofers.
What was the question again?
Was there a question
or am I just talking
to myself ... again? |
| WWAAHAHAHAHAHA here some coffee for the brudda.... | Terrible Terrence
Feb 22, 2002 1:41 PM | | Now pull yourself together MAN!!!! And for crying out loud stop making those resonant tones that come from blowing over the top of the empty bottle. We already know that rooms resonate like the empty bottle does!!! hehehehehe
Terrence |
| re: Subwoofers.....sealed enclosures versus ported enclosures | sam9
Feb 22, 2002 11:07 AM | | It is also important to realize that a sealed sub can can more readily accept equalization to to flatten out and extend response. The trapped air protects the driver from over excursion. The offset is that you need a lot of power from the sub amp to do this. Sunfire is a classic example. |
| |
