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Sealing ported enclosure to reduce boom

Is sealing ports and adding fill an option if you have ported cabinets that are boomy? Just got some Kappa 8.1 and bass is boomy and unrealistic. I like my Kappa 7 better which is sealed but the 8.1 has some interesting drivers.
ifsixwasnin9
wireless200
415 posts
 
I had a pair of Dynaudio Focus 140s. They came with port plugs. I like the sound with them in better in my bedroom system. Just too much boominess without them. They sounded great with the ports plugged. And it was very easy to pull them in and out for experimentation though it was immediately clear to me that they were best left in for my setup.
face
516 posts
 
"Sealing" the port is a bad idea. The drivers and crossover were designed to work with the port open, at least to some degree.
Knownothing, how would it affect the crossover?

Here's an example what you're effectively doing when a port is plugged.
http://yfrog.com/4jw26fxsealedvsportedj
knownothing
1,654 posts
 
Depends on the speaker, but if you have a three or more way speaker and multiple ported chambers, you could have some frequencies drop out if the mid woofer driver/crossover combo is "looking" to the port for bass reinforcement. Probably not common, but possible.
pani
1,220 posts
 
There is a very fundamental theory of room acoustics which no one has mentioned yet. Place the speakers at one of the room nodes and see how the boom reduces drastically. So how do you find out a room node ? It is simple, play a bass track which typically has an overhang in your room. Connect one speaker at a time (disconnect the other speaker). Stand next to the speaker that is playing, move around the speaker listening for the location where you hear the maximum overhang. You can just move within a radius of 1 foot form the existing location of the speaker and find out the spot of maximum bass/overhang. Once you locate it, place the speaker right at that spot. Repeat the same for the other speaker. You may have to move them inches to get the right imaging but for sure your bass issues would be reduced. You may even do this for one speaker, which you think is causing the maximum boom, this also you can ensure by playing a single speaker at a time and listening from your sweet spot to determine which speaker is causing more boom. Do it for that speaker, keep it fixed at that location and move the other speaker around for imaging and staging. Try it !!
oakleys
78 posts
 
didnt bother to read the other posts, but you do realize that you paid your monies for the design of your spkrs, therefore then you realize that your spkrs were designed to have a port, for a very particular reason....boom is most likely a result of your placement of your spkrs w/in your room. move them away from room boundaries? seems obvious.
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