RAD technologie

[Walt]

https://audioxpress.com/index.php/news/ ... -subwoofer

[Henkjan]

Brane's Repel-Attract-Driver (R.A.D.) breaks the Iron Law by using permanent magnetic forces to cancel internal air pressure forces. This proprietary force cancellation design allows Brane speakers to be compact, efficient and capable of producing deep bass.

maar verder dan dit algemene statement is er zo 123 niets over de technologie te vinden.
mss ergens in een patent, maar daar vermelden ze ook al niets over
zelfs een doorsnede tekening is niet te vinden

[Henkjan]

foto's van een naakte spreekspoel hier:
https://www.msn.com/en-us/lifestyle/sho ... r-AA169pSJ

The voice coil in Brane Audio’s R.A.D driver (Repel Attract Driver, right) features copper wire wound around moving and stationary magnets, where a more conventional driver (left) uses wire wound around a stationary magnet.

..... this Brane-storm replaces the conventional stationary magnet that usually surrounds the speaker voice coil with a combination of 12 moving and stationary magnets. These function in what Pinkerton describes as a “equal and opposite force” fashion to essentially cancel much of the air pressure needed within the enclosure to produce prodigious bass. At the same time, this transformative tech radically lowers the energy demands needed.....

[Henkjan]

het lijkt er op dat dit t patent is:
https://patents.google.com/patent/EP4094451A1/

in t draadje op DIY audio verwijzen ze uiteraard ook naar Mayht (dat patent wordt besprokenin VoiceCoil augustus 2022)

[Chocomel]

Gaaf!

Het draadje op diyAudio verwijst naar een link, waarin het mooi wordt samenvat:
https://audioxpress.com/article/patent- ... eaker-unit

The Negative Spring systems, as we have discussed in previous reviews, operate based on having an additional apparatus built into a transducer, which applies a force that is in opposition to the air spring of the enclosure.
[...]
If one could make this bi-directional, negative spring have just the right spring force and also the ability to remain stable and steady in its center position, they would potentially have a working system that, from the standpoint of the low-frequency driver, could make the enclosure seem larger than it really is.

Het lukte voorheen alleen nog niet om dit op de markt te krijgen.

Some negative spring experiments have at least shown some promise in the lab, and there have been hundreds of attempts to create practical devices since the first efforts in the mid-1950s, but to-date these have continued to elude some of the most brilliant minds in the business, with nary a single product based on this technique ever making it to market.