Are carbon fiber speaker cabinets inherently better than wood or metal ones

It can be difficult to grasp the true benefits of carbon fiber as used to make speaker cabinets. Perhaps the stand out feature is that the low bass back waves off the larger drivers moves through the carbon fibers at a very high rate of speed and with the fibers correctly aligned will be directed away from the thinest part of the cabinet, the cone.  The fibers vibrate ( resonate ) at an extremely high frequency. 

Not sure what good this does? Well if you have a nice wine glass give it a ping. Now simply touching the glass with your finger quickly dampens the sound. This demonstrates how composite cabinets work best. The composite material does not have to be any high tech product, rather simply a material with a difference resonance point. 

The most cost-effective way to reduce enclosure and/or panel resonance is to brace like Hell. Look at the bracing Jim Salk uses in his subwoofer enclosures (into which he installs the Rythmik Audio 12" or 15" DIY kits). 

Adding braces adds more mass which is similar to poring a thick concrete slab to store solar energy. Then it is released slowly...not so good. 

What speaker's walls/baffle/floor base is carbon fiber solely. A .030-.050" veneer does not make a speaker carbon fiber nor does a Rosewood veneer make a speaker rosewood. 

Carbon at a thickness to resemble a wood cabinet would be very brittle in nature if using sheet form to construct. It will need to be thermoformed to make it very stiff and rigid. How many speakers are thermoformed with carbon entirely? Zero! 

@sounds_real_audio: Incorrect. The primary and most important reasons for and benefits of bracing is to:

1- Minimize the ability of the enclosure to expand (like a balloon being blown up)---thereby propagating sound---in reaction to the internal pressure created within the enclosure when the drivers move inward. That pressure is extreme, like a pot of boiling water with a tight lid on the stove with a high flame. Wall-to-wall braces prevent the enclosure from doing that. Again, look at how Jim Salk braces his subwoofer enclosures, and how Magico braces their loudspeaker enclosures.

2- Raise the resonant frequency of the enclosure panels to that above those excited greatest by the most problematic of the enclosure frequencies---the low ones (bass).