What is this "eventually" stuff you talk about? I thought it was "always crave". hehe
I have to admit...
I do like Irene and Bass I love u, more than I should!
Both excite the 5-10hz region.
Nah, this thread pops up about every other month. It always has the same conclusion:
That 15hz is "deep enough" and is still "practically achievable."
Unless you don't have the space, there is no reason NOT to port a UM-18 to 15hz for the average person.
I can't ever see me giving up on sealed or IB to which over to 15hz ported. I like single digit bass too much to give it up.
I gained something like 30db@15hz by converting one LMS-18 from sealed to horned, something ridiculous like that anyway...
Protecting such an expensive and irreplaceable driver via a horn is a good approach, as bottoming them out sealed is fairly easy to do. But not so in a horn, it's well protected by a HPF and air back-forces.
I will be adding more 21's to "make up" for the converted LMS-18's.
Additionally, as I move away from Behringer and Crown and move towards FP's, I'm gaining more SPL in the single digits.
The 14k is flat to 2hz and the 10k is flat to 7hz. iTechs are 7hz and powersoft K's are 4hz I believe...
I don't run any HPF on my sealed's. Only the horn sub.(Just like you would a ported.)
Right now I'm flat to 4hz, but that may hit 2hz once the FP switch-over is completed.
I don't think aiming below 15hz should be a "goal" for the average person.
Porting a $200 cone to 15hz is fairly trivial. Takes 1-2 sheets of plywood. DONE!
But getting lots of <15hz is very expensive because it takes SO MANY sealed or IB'ed cones and flat amps and flat sources in order to get enough SPL for it to be "usable".
It's just way too expensive and big to stomach for most.
and on top of all that, there is the missing content below 30hz, which is almost a topic onto itself.
But add the combination of the two together and it makes the idea even less
$10,000 for 5 seconds of bass, once per movie, and on only the odd 5-star basshead-movie.
Also, <15hz can be easily masked by higher frequencies, especially loud 1-8khz treble or mid-bass!
Getting 1-10hz with ported boxes isn't practical either, the boxes get too big. Look at how big Not's ported boxes are, and those aren't even tuned to 10hz yet!!!
Trying to get 7hz out of an array of 15hz ported subs isn't a practical option either.
You basically have to abandon the idea of <15hz from your mind, or you'll go nuts...
I totally understand people who abandon <15hz stuff for >15hz stuff. It's "deep enough" and still achievable with 2 or 4 18's.
For those that like single digits you already know who you are, and you don't have to convince anyone but yourself.
For a number of years now, JapanDave's system with 8 IB'ed RE's and real Gruppen's has been: "the reference 2Hz system that all others are judged against", and basically, still is...
Few have matched or exceeded it, and even fewer, ever will...
4.25*8*PI*9^2 is a lot of cubic-inches of displacement!