Does the port area rule of thumb apply to home theater subs?

[bubbagumper6]

I'm going to be building a small 3 cube box for a 12" sub and I'm just wondering if a 4" flared aero will be enough?

[hispls]

I think the key is displacement of the sub. Many home audio specific or favorite drivers are high efficiency/low mass/low x-max so they can get away with less area. Also it's not like you're tuning for a 30db peak at 50hz in your living room either so I'd just plan around enough so that it can handle displacement without chuffing or becoming a leaky sealed box.

[bubbagumper6]

Bump this back up, the sub I'm using is this one. So would a 4" Flared Aero be enough for a 3 cubic foot box?

[loud-n-low]

what tuning?

[bubbagumper6]

25hz

[loud-n-low]

I would suggest firing the sub foward,and have the port firing back(like hsu subs and svs) I talked to hsu the other day and they say they use 4" ports vs 3" I would personaly tune at 20hz, use 2 ports,and plug one to change tuning if you wanted

[Jh8909]

your neighbors not gonna like this lol

[bubbagumper6]

I would suggest firing the sub foward,and have the port firing back(like hsu subs and svs) I talked to hsu the other day and they say they use 4" ports vs 3" I would personaly tune at 20hz

Well I was planning on firing the both the sub and port forward, what would be wrong with that? And I modeled the sub in WinISD, 25hz modeled better than 20hz.

[bubbagumper6]

your neighbors not gonna like this lol

lol, I'm hoping that by building the sub enclosure I can put it right next to my chair, so it can be turned down but still give me some bass...

[Jh8909]

word. lol

[loud-n-low]

you would get more output from port facing back if you corner load it..bass could get a little boomy,maybe not.Also firing port back would minimize any port noise vs firing foward

[bubbagumper6]

you would get more output from port facing back if you corner load it..bass could get a little boomy,maybe not.Also firing port back would minimize any port noise vs firing foward

I don't want that right now, lol. That's what I'm trying to get away from. Corner load = my neighbor's walls vibrating

Why would firing to the back affect the port noise? Simply because it would be firing away from me so I wouldn't hear it as much? What about firing the port down?

[loud-n-low]

firing down would reduce almost all noise,and **** off the downstairs people if you have any. Mine fires down, no noise at all. im looking to fire back for more output

[bubbagumper6]

firing down would reduce almost all noise,and **** off the downstairs people if you have any. Mine fires down, no noise at all. im looking to fire back for more output

Bottom floor FTW

I'm not looking for huge amounts of output, mainly SQ, I don't want to shake the walls (and obviously can't right now). The only thing I don't like about down firing is that with a 4" port, the box would have to have at least 2" of clearance at the bottom right? Not as easy to move around too and I have to worry about standoffs or legs, w/e...

[loud-n-low]

yes,you would have to elevate it if firing down. If you do sub and port firing foward,I suggested tuning lower to avoid peaky bass,and for flatter response.