Originally Posted by DaJoJo
still i cannot agree on the ported vs sealed.. like u say the sealed will give more extension, but the ported gives more airmovement hence my saying that ported give better explosions feel coz the more movement of the air.. not neccesarly making the bass better hearable in lower freqs. if you have open holes like open windows or door or ventilation, the whole benefit of ported gets less whereas the sealed one does not have this problem. also a ported sub need a adequate amp plate to compensate for the free moving woofer vs the sealed that needs less power. so a underpowered ported will loose from sealed and a overpowered sealed will break faster. there is not really a solid answer that goes for all ported or sealed. also big or small room makes a difference and whether one has open space to other room or hallway. there is a common fact that 2 or 4 subs really smooth out the bass along the room and this goes for any brand or type. while 3 subs can totally ruin the effect. in a small room with one sub in the middle there is no need for the second sub. also things as a couch made of fabric will work as a basstrap and leather sofa's will work as a reflection area . there is only one way to find out and that is measurement and hearing in one's room itself.
I agree with almost everything that you just said, and your insights are valuable.
The two exceptions are the sentence I highlighted, and the idea of using a sofa as a bass trap. First, with respect to a ported sub being less effective than a sealed sub, in a room with openings, I have never read anything that would suggest that, nor does the concept seem quite right to me on its face.
Subs, whether ported or sealed, simply produce the volumes they produce, at the particular frequencies that they produce them. And the bass waves that result simply interact with room modes, however they do. There is nothing about the room, or the sound waves produced, that can distinguish between sealed subs and ported ones. A ported sub actually has a better chance of working well in a room which is open to other spaces, simply because it is capable of providing more output at most frequencies than a comparable sealed sub.
The idea of a sofa acting as a bass trap is appealing, but I think it would take a very exceptional sofa to provide any meaningful attenuation below about 200Hz or 300Hz. The foam bass traps, such as those sold on Amazon, are about 12" deep, and can only provide any meaningful attenuation down to about 240Hz. A good bass trap should go down to at least 120Hz, and a very good one can provide significant attenuation down to about 60Hz, or lower.
I think that it would be possible to put acoustical material inside a sofa to create a bass trap, but just the normal foam stuffing doesn't actually do much with respect to bass, although it can certainly help for mid-range and treble absorption.