Stehno hit it on the head.
Rives also brings up some important points. One sub IS harder to place than two. On the other hand, two well designed commercially built subs can be quite expensive.
Just keep in mind that a vent of any type ( ported, passive radiator, slot loading and yes, even transmission line ) will have slower transient response ( reduced impact, less definition, increased ringing, poorer decay, etc... ) than a well designed sealed box would offer. The sealed box will also TYPICALLY have less problems with interfering in the upper bass since there is no leakage through the port or passive radiator "talking". Placement should also be easier since you only have to worry about room reinforcement / nodes from one radiating surface ( unless you have multiple drivers ).
The major drawback to sealed woofers is that a good one will be quite large. Having said that, two good quality sealed subs that are offer large box volumes would be VERY hard to beat if properly set up.
As to the Bag End, it is equalized to produce 8 Hz, but only at very low volume levels. As driver excursion and spl is increased, the bass processor rolls off the extreme lows so as not to muddy the more prominent notes slightly above this range. Kind of like a smart "loudness" control that one can find on receivers, etc... The biggest problem with Bag Ends is the construction of the cabinet, which is not as rigid or damped as it should be. It also takes a pretty good amount of power to really make this thing sing, which is true of almost all subwoofers. Sean
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Rives also brings up some important points. One sub IS harder to place than two. On the other hand, two well designed commercially built subs can be quite expensive.
Just keep in mind that a vent of any type ( ported, passive radiator, slot loading and yes, even transmission line ) will have slower transient response ( reduced impact, less definition, increased ringing, poorer decay, etc... ) than a well designed sealed box would offer. The sealed box will also TYPICALLY have less problems with interfering in the upper bass since there is no leakage through the port or passive radiator "talking". Placement should also be easier since you only have to worry about room reinforcement / nodes from one radiating surface ( unless you have multiple drivers ).
The major drawback to sealed woofers is that a good one will be quite large. Having said that, two good quality sealed subs that are offer large box volumes would be VERY hard to beat if properly set up.
As to the Bag End, it is equalized to produce 8 Hz, but only at very low volume levels. As driver excursion and spl is increased, the bass processor rolls off the extreme lows so as not to muddy the more prominent notes slightly above this range. Kind of like a smart "loudness" control that one can find on receivers, etc... The biggest problem with Bag Ends is the construction of the cabinet, which is not as rigid or damped as it should be. It also takes a pretty good amount of power to really make this thing sing, which is true of almost all subwoofers. Sean
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