{"product_id":"jeff-rowland-design-criterion-preamplifier","title":"Jeff Rowland Design Criterion Preamplifier","description":"The Jeff Rowland Design Criterion is a solid-state, twin-chassis stereo preamplifier featuring a 10 Hz to 300 kHz frequency response, 99.5 dB volume range in 0.5 dB steps, four balanced XLR and two RCA inputs, plus four main and two record outputs. Engineered to command flagship audio systems, this dual-enclosure control center isolates delicate audio circuits from AC grid noise by running on an off-line rechargeable NiMH battery supply. Milled from solid aircraft-grade aluminum billet and weighing 46 pounds, its stacked enclosures couple via four Delrin balls to suppress vibration. Low-capacitance ceramic circuit boards, fully balanced differential gain stages, and transformer coupling preserve low-level nuance, while programmable input gain offsets calibrate each source.\n\nReviews from HiFi-Advice and Positive Feedback praise its ink-black background, effortless fluidity, and holographic soundstage depth. Critics highlight how the battery supply and ceramic boards blend classic Rowland warmth with striking transparency and dynamic speed. Though it bypassed mainstream award circuits, audiophile reviewers regard this twin-chassis unit as a benchmark in solid-state preamplification and billet metalwork.\n\nPlacing off-grid battery power at the heart of your system strips away electrical haze and lets recordings breathe with unforced realism. For listeners seeking an enduring analog centerpiece that unites engineering rigor with emotional truth, it delivers deep musical immersion.","brand":"Jeff Rowland Design","offers":[{"title":"Default Title","offer_id":68684282495257,"sku":"101474","price":7599.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0844\/4225\/1545\/files\/101474-5.jpg?v=1794599159","url":"https:\/\/tmraudio.com\/products\/jeff-rowland-design-criterion-preamplifier","provider":"The Music Room","version":"1.0","type":"link"}