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Is this good? Boom Bass Cabinet

...That stats on that cab you linked are pretty stout. Good down to 30hz and 1400W. It should be a big upgrade to your Crate combo.
  • First of all, no one really wants content at 30Hz. Creates more problems, and doesn't really add anything people want.
  • Second, no cab actually reproduces content at 30Hz that is loud enough to be reasonably heard. It's often actually -12dB @ 30Hz or something like that.
So don't let their specs mislead you.
 
First off @Dave Hill seems to have owned all of these and his opinions on is the “fear stuff” is better.

On the Boom thread linked @Brad Johnson was comparing the BBCs to Glasstones. That I can speak to. I own a Gladstone 212 with one forward firing 12 in the baffle and a second 12, switch selectable, that fire down into the port shelf. I also have a fEARful 15/6.

The fEARful is my most favorite cabinet ever. The Glasstone was disappointing. I only ever use it as an 8 ohm 112, where the nice volume of the box makes it pretty good, but it can’t hold a candle to the 12” Fearless cab I demoed. And in 212, 4 Ohm mode the Glasstone becomes a midrange monster. I don’t think bringing the second 12 online adds any bass at all, just ups the volume by pumping a lot more mids that sound mostly like 400 through 1k or so.

I’d go with the “fear stuff”.
 
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  • First of all, no one really wants content at 30Hz. Creates more problems, and doesn't really add anything people want.
  • Second, no cab actually reproduces content at 30Hz that is loud enough to be reasonably heard. It's often actually -12dB @ 30Hz or something like that.
So don't let their specs mislead you.

Most cabs that say 30hz---are down more like 20db at 30hz. But--your perception about 30hz extension is valid . The reason is that almost all cabs claiming this are reflex cabs. Here's the problem with that extension with a reflex cab
1. most of the information at that frequency is coming out of the port. That quality of bass is very poor and uncontrolled. The great home hifi speaker designer John Dunlavy told me " I don't want to hear any bass coming out of a port." Ported enclosures are a cool compromise--you can get loud, have a small enclosure, and have good efficiency. A compromise is in the bottom octave or so. A sealed box that actually goes that low will have a much better quality of bass---but they will be huge, won't go as loud, and would be low efficiency.

2.All of the drivers that I know that aren't designed exclusively for subs--all of the woofers used in bass cabs---have a free air resonance of 40 to 50 hz. They don't work well under that.

3.Most reflex cabs are tuned (typically) in the 42 to 50 hz range. What this means is that any frequency under that tuning frequency--the speaker behaves as in free air. Which means that it's flopping around aimlessly. What this means is that when you play a note under that tuning frequency--typically under 42hz (or higher in many cases) The speaker is just flopping around trying to reproduce that note. What happens is that since the cone movement is uncontrolled, the second harmonic (octave) is being reproduced poorly as the cone is uncontrolled. The second harmonic is what we key off of for pitch. That second harmonic then is boomy and uncontrolled. This is the reason that many guys (correctly) say that having that extension causes too many problems on stage---not the fact of reproducing 30hz. People should use a HPF set to around 40hz. All of a sudden the B string tightens up and you lose the boom. Running a reflex cab without a HPF will result in a crappy B string sound.

There are however, some cabs that are of a different design that don't unload and can reproduce the B. When you hear a cab that goes that low and play on the B string---all of a sudden it sounds and feels like the other strings. The fundamentals in that range---while not really needed for an effective B string--do add a pretty neat cushion that does not get in the way.