{"product_id":"rupert-neve-designs-optofet-b-stock","title":"Rupert Neve Designs OptoFET (B-stock)","description":"\u003cp data-start=\"179\" data-end=\"654\"\u003eThe \u003cstrong data-start=\"179\" data-end=\"264\"\u003eRupert Neve Designs OptoFET Dual Band Compressor and Harmonic Processor\u003c\/strong\u003e is a fully analogue single-channel dual-topology compressor that combines a high-speed FET compressor and an optimised optical compressor into a 1U rackmount unit offering serial or frequency-split dual-band operation, variable crossover control, parallel blending, harmonic wave shaping, transformer-balanced I\/O and comprehensive gain staging for advanced dynamic and tonal manipulation.\u003c\/p\u003e\n\u003ch2 data-start=\"656\" data-end=\"671\"\u003e\u003cstrong data-start=\"659\" data-end=\"671\"\u003eOverview\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"673\" data-end=\"1172\"\u003eThe OptoFET merges two fundamentally different compression architectures into a single processing engine that delivers both precision control and harmonic shaping. The FET section provides extremely fast transient handling while the optical section introduces slower envelope control and low-order harmonic enhancement. The unit operates either as a dual-stage serial compressor or as a frequency-divided dual-band processor, allowing independent dynamic treatment of low and high frequency content.\u003c\/p\u003e\n\u003cp data-start=\"1174\" data-end=\"1505\"\u003eThe design supports detailed gain staging through global input and output trims and independent make-up gain stages for each compressor. These gain structures allow the user to move seamlessly between transparent dynamic control and creative harmonic enhancement while maintaining full headroom across transformer-balanced outputs.\u003c\/p\u003e\n\u003ch2 data-start=\"1507\" data-end=\"1549\"\u003e\u003cstrong data-start=\"1510\" data-end=\"1549\"\u003eDual Stage and Dual Band Processing\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"1551\" data-end=\"1825\"\u003eDual Stage mode routes the FET and optical compressors in series, allowing progressive dynamic shaping across two independent compression engines. The global Flip control changes the order of the compressors to tailor transient response and harmonic behaviour to the source.\u003c\/p\u003e\n\u003cp data-start=\"1827\" data-end=\"2203\"\u003eDual Band mode activates a fully variable crossover that splits the signal between low and high frequency bands from 50 Hz to 500 Hz. Each compressor receives its own band, allowing independent processing of bass and mid to high frequency content. The Flip function also assigns either compressor to either frequency band, enabling precise tonal sculpting across the spectrum.\u003c\/p\u003e\n\u003ch2 data-start=\"2205\" data-end=\"2240\"\u003e\u003cstrong data-start=\"2208\" data-end=\"2240\"\u003eFET Compression Architecture\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"2242\" data-end=\"2597\"\u003eThe FET compressor focuses on transient management and upper harmonic shaping. It provides ultra-fast attack down to 100 microseconds, variable release, switchable 4:1 and 8:1 ratios and a 125 Hz side-chain high-pass filter that preserves low frequency energy. A parallel blend control allows continuous adjustment between compressed and dry signal paths.\u003c\/p\u003e\n\u003cp data-start=\"2599\" data-end=\"2847\"\u003eThe GRIT mode introduces controlled high-frequency harmonic saturation by modifying the side-chain detection behaviour. This function allows subtle enhancement of articulation or aggressive wave shaping when driven through the internal gain stages.\u003c\/p\u003e\n\u003ch2 data-start=\"2849\" data-end=\"2888\"\u003e\u003cstrong data-start=\"2852\" data-end=\"2888\"\u003eOptical Compression Architecture\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"2890\" data-end=\"3189\"\u003eThe optical compressor introduces slower attack behaviour and enhanced low-order harmonic content for density and warmth. It offers variable attack starting at 5 milliseconds, variable release, switchable 2:1 and 5:1 ratios and a 125 Hz side-chain high-pass filter for stable low-frequency response.\u003c\/p\u003e\n\u003cp data-start=\"3191\" data-end=\"3453\"\u003eThe BLOOM mode increases harmonic density within the low and low-mid frequency range, allowing tonal thickening and low-frequency enhancement without conventional equalisation. Parallel blending enables subtle enhancement or full parallel compression techniques.\u003c\/p\u003e\n\u003ch2 data-start=\"3455\" data-end=\"3495\"\u003e\u003cstrong data-start=\"3458\" data-end=\"3495\"\u003eGain Staging and Harmonic Control\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"3497\" data-end=\"3885\"\u003eIndependent input and output trims offer ±12 dB of control for driving internal stages or maintaining clean headroom. Each compressor also includes its own make-up gain stage that allows deliberate harmonic excitation in Dual Stage mode or spectral balance control in Dual Band mode. Transformer-balanced outputs preserve transient integrity and harmonic content at high operating levels.\u003c\/p\u003e\n\u003ch2 data-start=\"3887\" data-end=\"3915\"\u003e\u003cstrong data-start=\"3890\" data-end=\"3915\"\u003eMetering and Workflow\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-start=\"3917\" data-end=\"4163\"\u003eDedicated gain reduction meters display real-time compression for each stage while the output meter displays final level. Fully detented 31-step potentiometers ensure accurate recall, stereo matching and predictable repeatability across sessions.\u003c\/p\u003e\n\u003ch3 data-start=\"4165\" data-end=\"4215\"\u003e\u003cstrong data-start=\"4169\" data-end=\"4215\"\u003eWhy Choose the Rupert Neve Designs OptoFET\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul data-start=\"4217\" data-end=\"4603\"\u003e\n\u003cli data-start=\"4217\" data-end=\"4315\"\u003e\n\u003cp data-start=\"4219\" data-end=\"4315\"\u003eEnables independent control of bass and high frequencies for clearer mixes and tighter low end\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4316\" data-end=\"4389\"\u003e\n\u003cp data-start=\"4318\" data-end=\"4389\"\u003eAdds analogue harmonic character without sacrificing transient detail\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4390\" data-end=\"4458\"\u003e\n\u003cp data-start=\"4392\" data-end=\"4458\"\u003eSimplifies complex multi-compressor workflows into a single unit\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4459\" data-end=\"4531\"\u003e\n\u003cp data-start=\"4461\" data-end=\"4531\"\u003eProvides repeatable recall for professional mastering and production\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4532\" data-end=\"4603\"\u003e\n\u003cp data-start=\"4534\" data-end=\"4603\"\u003eDelivers both transparent and creative compression in one processor\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"4605\" data-end=\"4608\"\u003e","brand":"KMR Audio","offers":[{"title":"Default Title","offer_id":57827088990591,"sku":null,"price":1329.17,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/4915\/9716\/files\/rnd-optofet-kmr4.jpg?v=1767618308","url":"https:\/\/kmraudio.com\/products\/rupert-neve-designs-optofet-b-stock","provider":"KMR Audio","version":"1.0","type":"link"}