The Opus3 was built specifically to bring the entry-level and the mid-range phono cartridges closer together, creating an even tighter ecosystem of cartridges. We worked on the Opus3 knowing we wanted to have a cost-effective wooden cartridge while at the same time taking advantage of the techniques and processes used in the higher-end models.If taking a step up in your turntable setup is on your to-do list, start here. This is the first cartridge built with a maple wood housing, as well as the first to use what we learned with our high-end cartridges at such an entry-level price. The housing is a new shape but still keeps the wood working in tandem with the cartridge inside. This is also the first cartridge built specifically with the Timbre Series in mind.Each Opus3 is hand-built by our team in Brooklyn. Fine tuned for everything from entry-level turntables up to the highest-end stereo systems, the solid mass of the wood helps keep the Opus3 steady and producing the Grado signature sound. We started building cartridges on a kitchen table in 1953, and every experience since then has led to the creation of the Opus3. Opus3 Timbre Series Body: Maple Wood Cantilever: Aluminum / Elliptical Diamond Output: High 4.0mV @5 CMV (45) Low 1.0mV @5 CMV (45) Inductance: High Output 55mH Low Output 6mH Resistance: High Output 660 ohms Low Output 70 ohms Input Load: 10k-47k ohms Cartridge Weight: 8 grams Tracking Force: 1.6-1.9 grams Compliance: 20μm/mN Channel Seperation: Average 30db - 10-30k Hz Controlled Frequency Response: 10-60 kHz Non-Sensative to Capacitive Load Builds: High Output, Low Output, Mono