We are proud to present our latest project — the Reed SF optical cartridge, developed in collaboration with the renowned Japanese company DS Audio.
Unlike traditional MC or MM cartridges, optical cartridge technology offers unique advantages that elevate the listening experience. Free from magnetic resistance and characterized by an exceptionally low moving mass, the stylus moves with remarkable smoothness and precision. These features result in superior sonic performance — something every vinyl enthusiast will appreciate.
To fully harness the potential of this technology, we placed great emphasis on selecting the optimal housing material, focusing on acoustic neutrality and effective vibration damping.
The cartridge body material must be acoustically passive, homogeneous, and exhibit high damping across the entire operational range. To identify the most suitable option, we conducted a comparative study of three materials: aluminum, Panzerholz (tankwood), and 100% HD phenolic resin. Each material sample, identical in shape, was subjected to shock waves of equal amplitude. The decay times of induced acoustic signals were then measured at a fixed distance from the impact point.
The results were conclusive:
- Aluminum: sound dissipated after ~120 ms
- Panzerholz: ~70 ms
- 100% HD phenolic resin: just ~15 ms
Given these findings, along with the resin’s additional benefits — including low surface roughness, high density, and excellent elasticity — we chose 100% HD phenolic resin as the material for the Reed SF cartridge body.
To ensure durability and consistent performance, the cartridge housing was also engineered to minimize dust intrusion. Any dust that does enter can be easily removed through a specially designed access point, ensuring a long service life.
SPECIFICATIONS
Signal outputPhoto-electric ConversionChannel separation27 dB more（1kHz）Weight9.8 gOutput signal level70 mVCanti-leverSapphireBody materialHD phenolic resin / aviation aluminumNeedle pressure2.0 g～2.2 g (2.1 g is recommended)StylusMicro Ridge