Originally Posted by SteveMo
Here is my measurement of two rear subwoofers (total of four) firing into the rear couches.
SteveMo, couches ARE different from walls and hardwood floors.
But that is irrelevant. Of course a sub will measure differently when it faces a wall versus into the room. As will, too, a sub measure differently when it is rotated 90°, raised 6", or placed in another location. OK. So? Maybe positioning a sub along the left side of a room but firing into the wall from 8" provides the best measurements? Or not. Of course, if you measured a sub with it's driver facing a wall and then spun it around 180° and measured it again, the measurements would be different! So? Could you definitively attribute something about the measurements to the wall? Maybe. Could you call it detrimental? Maybe. Would all subs, rooms, and measurements show the same affect of the wall upon a sub's output. Maybe. How many different HT environments would you need to do the measurements in? And how many different distances to the wall? Would it be possible that in some HT environments an orientation that fires into the wall is best while in another it is not?
Can you show me someone's measurements that definitively show that positioning a sub so that it is firing into the wall will ALWAYS produce detrimental results?
I have a feeling that you think that a wall can somehow either absorb or alter the sound of the sub in a detrimental way. Sure, it may produce terrible boom. Or it may not. It may create a null. Or it may not. It is just like any other orientation or location. If the FR is terrible in a particular orientation and location, then you wouldn't orient it that way in that location. Simple. If you discovered that positioning your subs so that they were firing into the wall provided much better measurements than any other orientations, would you not orient your subs that way? There is no rule of thumb that says a sub shouldn't or can't be set up so that it fires into a wall. Not that I have seen, anyway.
Does a floor-firing subwoofer sound characteristically different than a front firing sub? Sure it does, unless you have a perfect room. I can remember a few years back, people were removing the baseplates from their downfiring SVS subs and flipping them on their sides with the drivers facing out into the room. Supposedly provided more punch. Fine. Did it sound "better"? To someone it did. So? But others still preferred the sub in a downfiring orientation. So? SVS still makes downfiring subs, as do several other manufacturers. Look at the eD P7-650. I suspect that many of the owners of HSU's sidefiring subs have their subs oriented such that they are firing more toward a wall than into the room.
There is nothing inherently different in the behavior of the soundwaves produced by a sub that is firing at a hardwood floor or baseplate from 3" vs. a sub that is firing at a wall from 6" (or 3", for that matter). Why are you OK with a floor firing sub, but not OK with one that fires into a wall?
And forgive me if my tone is too adversarial. That is not my intent. I just want to know why a sub, generally and universally, shouldn't be oriented so that its driver fires at a wall.
Originally Posted by SteveMo
I thought I was being fair and unbias. I said that I was expressing my opinion.
Opinions are NEVER unbiased. EVER.
But, why do you have this opinion? Is it just a hunch? Just doesn't seem like a good idea? You've seen a lot of measurments examining this issue? What?