Originally Posted by michaelscott73
I know you are only posting the article, but that is the rather stupid to me.
If it sounds "fatter", the ear is interpreting it as "louder", and the quicker attack seems like the output is less, why would you get the sealed sub if you want higher output?? So that on a graph with a microphone it is louder?
"Output" is not the only goal when designing a subwoofer system. Some folks favor extension... on one or both ends of the bandwidth. Others want excellent sound quality. Still others prefer short transient, (temporal), response, (so-called "fast" bass.), while others prefer the "fatter" / "fuller" sound of slow transient response. In addition, the size and shape of the room, as well as the distance to the listening position must be taken into consideration. Finally, the budget comes into play and is the final arbiter of how close the system designer can come to achieving the goals.
Once the goals and priorities are determined, then the system designer can evaluate the strengths and weaknesses of different alignments, (sealed/vented), to determine the best approach to reach the goals within the budget. For example, if the goal is deep infrasonic extension at reference level, in a modest, sealed room, multiple sealed subs will be the most efficient method to achieve that goal. The shallow natural roll-off of sealed subs combined with the "pressure vessel gain", (PVG), experienced in smaller, sealed rooms results in huge output at deep infrasonic frequencies. The ULS-15 works exceptionally well in this scenario, (multiples, of course.)
A sub like the VTF-15H, used in "vented" mode, would be the wrong tool for this job. It rolls off too rapidly to benefit from PVG:
It could be used in sealed sub with it's ports blocked, but you would likely want multiples to achieve useful output:
OTOH, if the goal is Reference Level at 20 Hz and above, and the infrasonics are not important, the vented VTF-15H sub system could be the more efficient choice.
So, before you label something as "stupid", you should try to understand the design choices better. You might make a better decision yourself.
CraigEdited by craig john - 6/16/12 at 6:51am