Why is good, deep bass so difficult? - Myths and their Busters

So here are a few things to consider.

1. Most woofers double. 40 Hz turns quickly to 80 Hz. 
2. The law of physics would dictate that a 10" woofer will not keep up with a 6" midrange. Too much mass. They must use very stiff suspensions to bring them back to neutral position after each excursion.
3. Woofers are screwed into a large piece of MDF. The very back and forth movement of the diaphragm causes that piece of MDF to resonate. 
4. Massive objects resonate at frequencies that are hard, very hard to deal with.

erik

Placing weights on the top of a speaker may change the sound, for the better, I don't know, my speakers have sloped tops so I can test that out. I can tell you that you will not control cabinet resonance by adding weight. You might change the resonance point. Remember that light objects have higher resonance, more massive objects have much lower and much more difficult to control resonance. Simply take a wine glass and ping it with you finger nail. Now to stop the glass from ringing simply touch it with your finger. Two laws of physics come into play here. The first is that low mass objects will resonant at a high frequency. the second is that composite objects will more quickly do away with unwanted resonance. When you touch the wine glass with your finger you are essentially creating a composite of materials, your finger and the glass. Two disparate materials. 

So I conclude with this: Purchase speakers that are made from composite materials. Two do not always assume that those big heavy massive speakers will have better bass. 

"The ideal that large woofers are slow is a myth is a myth. "

Large more massive objects are more difficult to move quickly. 
We all learned that in high school physics, I thought we did anyway.

Woofers are no different. 

erik

I don't think your 15" sub will keep up with your 6.5" midrange. Not much cohesiveness. To each his own. 

This is interesting, from wikipedia:

Equalisation of the sound system to compensate for the uneven frequency response caused by room resonances is of very limited use as the equalisation only works for one specific listening position and will actually cause the response to be worse in other listening positions. Also large bass boosts by sound system EQ can severely reduce the headroom in the sound system itself. Some vendors are currently providing elaborate room tuning equipment which requires precision microphones, extensive data collection, and uses computerised electronic filtering to implement the necessary compensation for the rooms modes. There is some controversy about the relative worth of the improvement in ordinary rooms, given the very high cost of these systems.

shadone

Can you find a recording studio using 15" subwoofers. See if you can.

bdp24

I love that moniker.

You seem to reenforce the belief that subs are not in good control, if not they wouldn't need a servo. 

wolf-garcia

Very pretentious of you to assume you can simply enjoy music. How dare you.

Are you coming to the RMAF this year. I think we spoke about 6 years ago there. I had the Wilson Beseech Curves and deHavilland electronics. You were kind enough to give me some compilations. 

wolf_garcia

The show is pretty easy in easy out. Frontier Airlines " cheap flights now on sale " to DIA then $35 shuttle to Marriott. There are other hotels close by that are cheap to stay at. 

I am going to be in the Bricasti Room 7013. Managed to get a pair of Wilson Benesch Evolutions to take to the show. Should sound great, I have a good history at the show. In another room, the Larkspur Wilson Beseech will have a pair of the Torus Infrasonic Generators. Or as Jonathan Valin said " 

"Strokes of genius are rare in any field,
          but I think Milnes’ Torus qualifies”

 - Jonathan Valin, The Absolute Sound, 2007

Anyway if you make it you can try to be kind to me, even if you have to go  against your nature.

So with my two Torus Infrasonic Generators I don't use any room treatments. My theory on why that is goes like this: The bass they produce is not doubling at 40 hz causing 80hz room resonating frequencies. There is extremely low cabinet resonance which again gets the room excited. 

In addition with the Torus, the 18" carbon fiber diaphragm operates like an electrostatic. In push pull. It is bi-wired so there is no stiff suspension to slow it down. I is its own servo. 

This is the promise of technology and good engineering, not just100 lb magnets and 8" of travel.