Originally Posted by tbass2k
Tom, what are the pros and cons of down firing vs front firing ports?
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First, it is important to separate subjective (and often very casual) POVs with measurable benefits. Some talk of the wind from a port facing directly at the seat as a fun effect. But I've spoken with a good percentage of folks who find that distracting. Myself, I can enjoy the parlor-trick aspect of it to be sure...but eventually I did find it to distract me from the "suspension of disbelief" with good films. I mean, how often does loud bass on screen visually correlate with you suddenly feeling a breeze? But having that nearfield and firing into the back of your sofa or something like that is better and something, again, some do enjoy.
Benefits to this specific down firing design.
* If you are firing into carpet harmonics will be absorbed but anything <200hz or so isn't affected. Not going to be anything very audible, but's it is real and measurable.
* Any spurious port "noise" will also be minimized to some degree. With a huge 6" widely flared port that's not going to be much of an issue regardless.
* As discussed previously a single, large, circular, straight port is always going to be the most efficient use of space versus laminar air flow.
* With some consideration to design you can space the bottom of a down firing ported sub off the floor a given amount to "load" that space and effectively lengthen the port which will lower the tuning a little. Again, nothing I would ever claim as a huge difference but one of those "nice to haves" at the end of the day.
But, for me, I wanted to ensure maximum laminar flow for this design. Everything else was secondary with regards to the porting.
Power Sound Audio