Ramar JEWEL - Resonance Control Concept

Ramar JEWEL - Resonance Control Concept

DESIGN

All record weights and clamps known to us are similar in their basic cylindrical shape. With JEWEL, we have implemented a daring design concept and developed the first asymmetrical resonance control concept. Although the outer contours of the body, milled from solid stainless steel, are asymmetrical, in numerous computer simulations we have managed to achieve one hundred percent even weight distribution.

With our three-point approach, we have developed a unique resonance control concept. The combination of a shaft seal, brass rods and Sorbothane damping ring minimizes the contact points with the turntable and the record while allowing the energy of unwanted mechanical noise and vibrations from the record player and the vinyl itself to be absorbed and neutralized.

THREE-POINT APPROACH

• JEWEL is mounted to the spindle via a so-called shaft seal. The unique design of the shaft seal ring ensures a stable connection with the spindle. The elastic coating of the ring neutralizes the vibrations, that might be transmitted via the spindle. At the same time, the expandable NBR rubber coating allows JEWEL to be used on a wide variety of record players with different spindles. The material NBR (nitrile butadiene rubber) is an elastomer with excellent mechanical properties and has high abrasion and tensile strength. There is a coil spring around the centre hole inside the shaft seal that serves to stabilise the spindle mount additionally. 

• Eight brass rods are suspended independently of each other in the body. As soon as JEWEL is placed on the record, the rods plunge down and gently touch the surface. These transmit some of the resonances inside JEWEL, where they are eliminated. The suspension allows the individual rods to adapt perfectly to any differences in height of the record surface caused by different label structures. This ensures that the contact surface of the brass rods remains constant for all records.

• In collaboration with Sorbothane Inc., we have developed a unique Sorbothane damping ring. This was developed according to our specifications for the function, mass and shape of JEWEL and ensures balanced damping of unwanted vibrations and resonances from records.

Sorbothane is a proprietary, viscoelastic polymer. Viscoelastic means that the material has properties of both liquids and solids (elastic materials). Sorbothane combines shock absorption, good memory, vibration isolation and vibration damping. While many materials have only one of these properties, Sorbothane combines all of them in a stable material with a long service life.

IMPORTANT

In order to be able to use JEWEL properly, you need a visible (above the surface of the record) height of the spindle between a minimum of 6mm and a maximum of 16mm. With a lower or higher spindle length, the desired horizontal placement of JEWEL can be enormously impaired or even prevented.