Originally Posted by CBdicX
Hi, is a frontfire subwoofer a better and more powerfull (pushes more air into the room) subwoofer setup then a downfire ?
I ask this because all the "big" subwoofer brands use frontfire.
The brands that look to optical solutions use often downfire or something else then frontfire.
FWIW, I honestly don't think that one is better than another. The biggest advantage to front-firing ports, in my opinion, is for people who enjoy feeling the port wind that may be palpable at high SPL's, with frequencies playing somewhat close to the port tune.
For instance, PSA has recently introduced a new line of subwoofers called TV36's. They are very large and powerful, dual 18" subwoofers, with a port pointing downward on the bottom of a tall cabinet. In a few months, that same company will be introducing even taller, dual 21" subs, with a down-firing port. They will be called TV42's.
The point I am making with the above example is that different designers find different ways to get the port length they are looking for, while minimizing port turbulence. Some bend the port right at the bottom, to point in the same direction as the driver, or they curve the port gently and gradually, as Nathan Funk has just done in a recent 24" driver design. Or, they may maintain a straight front-firing port (which aligns with the driver), as the SVS PB subs do. Or, they maintain a straight down-firing port, as the SVS cylinders and the new PSA subs do.
As long as the port length and port diameter provide the tuning point required, and the port turbulence (laminar flow) is minimized, there doesn't seem to be any inherent design advantage to front-firing versus down-firing, other than the potential one mentioned in the first paragraph. I believe that everyone would agree that it is easier to get a smooth air flow, with less internal turbulence, with a straight port. But, clever designers seem to be able to work around that issue in different ways.
In other words, it really doesn't make much difference (other than some potential tactile response) which way drivers or ports point.