{"product_id":"grado-opus-4-phono-cartridge","title":"Grado Opus 4 Phono Cartridge","description":"\u003cp\u003eThe \u003cstrong\u003eGrado\u003c\/strong\u003e Opus 4 \u003cstrong\u003ephono cartridge\u003c\/strong\u003e is an analogue audio component engineered for vinyl enthusiasts seeking low mechanical resonance and natural harmonic presentation. Serving as the gateway to the Timbre Series, it houses a patented flux-bridger moving iron generator within a precision-machined North American maple enclosure. Available in High Output and Low Output configurations, the design delivers exceptionally low moving mass alongside wide phono preamplification compatibility.\u003c\/p\u003e\u003ch3\u003eThe Hi-Fi Centre Team Take\u003c\/h3\u003e\u003cp\u003eLiving with the Grado Opus 4 brings a tactile, organic richness to everyday record spinning that immediately sets it apart from typical synthetic cartridge bodies. It excels during focused evening sessions where acoustic jazz, orchestral movements, and intimate vocal pressings demand mid-band presence without fatiguing edge. The maple body naturally absorbs micro-vibrations, yielding a grounded soundstage that lets surface noise recede into the background. It is a deeply rewarding cartridge for listeners who prize musical flow and effortless texture over analytical sterility.\u003c\/p\u003e\u003ch3\u003eKey Acoustic \u0026amp; Design Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmerican Maple Housing:\u003c\/strong\u003e Machined hardwood enclosure naturally damps unwanted internal resonances for a pure, uncoloured acoustic performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlux-Bridger Moving Iron:\u003c\/strong\u003e Fixed-coil architecture reduces effective moving mass to deliver swift transient response and stable tracking.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElliptical Diamond Stylus:\u003c\/strong\u003e Precision-mounted profile traces record grooves accurately to extract subtle harmonic detail across the frequency spectrum.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAuthorized Dealer Support:\u003c\/strong\u003e Purchased through Hi-Fi Centre as an Authorized Dealer, ensuring genuine manufacturer warranty coverage and dedicated audio guidance.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand \u0026amp; Model:\u003c\/strong\u003e Grado Labs Opus 4 (Timbre Series)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTransducer Type:\u003c\/strong\u003e Moving Iron (Flux-Bridger)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody Material:\u003c\/strong\u003e North American Maple Wood\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCantilever \u0026amp; Stylus:\u003c\/strong\u003e Aluminium Cantilever, Bonded Elliptical Diamond\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Configurations:\u003c\/strong\u003e High Output (4.0 mV @ 5 CMV) \/ Low Output (1.0 mV @ 5 CMV)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency Response:\u003c\/strong\u003e 10 Hz – 60,000 Hz\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChannel Separation:\u003c\/strong\u003e 30 dB average (10 Hz – 30,000 Hz)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTracking Force Range:\u003c\/strong\u003e 1.6 g – 1.9 g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompliance:\u003c\/strong\u003e 20 μm\/mN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Load:\u003c\/strong\u003e 10,000 – 47,000 Ohms (capacitive load non-sensitive)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternal Inductance:\u003c\/strong\u003e High Output: 55 mH; Low Output: 6 mH\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternal Resistance:\u003c\/strong\u003e High Output: 660 Ohms; Low Output: 70 Ohms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCartridge Weight:\u003c\/strong\u003e 8.3 g\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Hi-Fi Centre","offers":[{"title":"High Output","offer_id":46005957853237,"sku":"Opus 4-HO","price":450.0,"currency_code":"CAD","in_stock":true},{"title":"Low Output","offer_id":46005957886005,"sku":"Opus 4-LO","price":450.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2246\/9355\/files\/GradoOpus4.jpg?v=1789583682","url":"https:\/\/hificentre.com\/products\/grado-opus-4-phono-cartridge","provider":"Hi-Fi Centre","version":"1.0","type":"link"}