{"product_id":"audio-research-ls28se-line-stage-preamplifier","title":"Audio Research LS28SE Line Stage Preamplifier","description":"\u003cp\u003eThe preamplifier is the heart of any high-performance audio system, the crucial component that routes signals, provides gain, and, most importantly, engages the listener. The Audio Research LS28SE is a line stage preamplifier that performs these duties with exceptional musicality, transparency, and control. As a Special Edition (SE) model, it inherits the latest component technologies and wiring from Audio Research's flagship Reference series, elevating its performance to a stunning new level. Built around a pure Class-A, all-tube analog circuit, the LS28SE delivers the holographic soundstage, rich tonal color, and dynamic realism that have made Audio Research a legend. It is the perfect, versatile, and user-friendly command center for the music lover who demands an immersive and emotionally profound connection to their music.\u003c\/p\u003e\n\u003ch5\u003eKey Features\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePure Class-A, All-Tube Circuit:\u003c\/strong\u003e The analog circuit features four 6H30 vacuum tubes in a pure Class-A, zero-feedback design for the most natural and musically engaging sound.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecial Edition (SE) Upgrades:\u003c\/strong\u003e Incorporates the same proprietary gold coupling caps and special internal wiring found in the flagship Reference 6SE, resulting in dramatically improved resolution and transparency.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile Inputs and Outputs:\u003c\/strong\u003e A complete suite of connectivity, including four balanced (XLR) and four single-ended (RCA) inputs, plus two balanced and two single-ended outputs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHome Theater Pass-Through:\u003c\/strong\u003e A discrete, processor pass-through input allows for easy integration into a high-end home theater system without compromising two-channel performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntuitive Front Panel Control:\u003c\/strong\u003e A large, clear vacuum-fluorescent display and soft-touch buttons provide easy access to all functions, including input naming, tube hours, and auto shutdown.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRobust, Regulated Power Supply:\u003c\/strong\u003e Features a low-noise R-core power transformer and a robust, highly regulated power supply for pure, stable power to all circuits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-in Tube Hour Meter:\u003c\/strong\u003e An integrated timer tracks the usage of the vacuum tubes, making it easy to know when it's time for a replacement set.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClassic Audio Research Build:\u003c\/strong\u003e Housed in the iconic chassis with a brushed aluminum faceplate, custom-machined buttons, and sturdy handles, all handcrafted in Minnesota, USA.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull-Function Metal Remote:\u003c\/strong\u003e Includes a full-function metal remote control for complete command from the listening chair.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5\u003eThe Power of \"Special Edition\"\u003c\/h5\u003e\n\u003cp\u003eThe \"SE\" designation signifies a profound upgrade, elevating the already superb LS28 to a new plane of performance. The LS28SE incorporates critical component technologies developed for Audio Research's flagship Reference series. The most vital signal paths now feature the same proprietary, custom-designed gold coupling capacitors and special internal wiring found in the REF6SE. This infusion of flagship DNA results in a dramatic improvement in resolution, a more refined and grain-free presentation, and a greater sense of dynamic immediacy. The soundstage becomes more focused and expansive, allowing you to hear deeper into the recording than ever before.\u003c\/p\u003e\n\u003ch5\u003eThe Heart of the Music: A Pure Tube Analog Stage\u003c\/h5\u003e\n\u003cp\u003eThe soul of the LS28SE resides in its analog circuit. This is where the signal is amplified and prepared for your power amplifier, and where the magic happens. Rejecting sterile, solid-state solutions, Audio Research has engineered a pure Class-A circuit with zero negative feedback, built around four 6H30 vacuum tubes. This hallmark design allows the LS28SE to produce a sound that is dynamically alive, harmonically rich, and dimensionally holographic. It delivers the kind of natural, fatigue-free presentation that encourages long, immersive listening sessions.\u003c\/p\u003e\n\u003ch5\u003eThe Flexible Command Center\u003c\/h5\u003e\n\u003cp\u003eThe LS28SE is designed to be the versatile heart of any high-end system. With a generous array of four balanced and four single-ended inputs, it can accommodate all of your sources with ease. You can even customize the input names on the clear front-panel display for intuitive operation. The inclusion of a discrete processor pass-through makes it simple to integrate the LS28SE into a sophisticated home theater system, ensuring you get reference-level two-channel performance without sacrificing multi-channel convenience.\u003c\/p\u003e\n\u003ch5\u003eA Legacy of Craftsmanship\u003c\/h5\u003e\n\u003cp\u003eThe LS28SE is instantly recognizable as an Audio Research component, built to the same exacting standards the company has upheld for over 50 years. The robust chassis, with its classic brushed aluminum faceplate and substantial handles, is a testament to its \"built-to-last\" philosophy. Every component is meticulously assembled by hand in Minnesota, USA, undergoing rigorous testing and quality control at every stage. This is not a product designed for obsolescence; it is a handcrafted musical instrument, built to provide a lifetime of listening pleasure.\u003c\/p\u003e\n\u003ch5\u003eThe Listening Room Difference\u003c\/h5\u003e\n\u003cp\u003eWhen you shop with The Listening Room, you get more than just gear. As a third-generation, family-run business with a passion for music and decades of experience, we offer personalized service that goes far beyond the sale. Call, text, or email, and you’ll get a real human who knows this equipment inside and out. From in-store demos to curated home system design and wide-radius delivery, we’re here to help you get the absolute best out of your purchase.\u003cbr\u003e\u003c\/p\u003e\n\u003ch5\u003eSpecifications\u003c\/h5\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eDetail\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency Response\u003c\/td\u003e\n\u003ctd\u003e+0-3dB, 0.4Hz to 200kHz at rated output\u003cbr\u003e(Balanced, 200k ohms load)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTHD+Noise\u003c\/td\u003e\n\u003ctd\u003eLess than .007% at 2V RMS BAL output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNoise\u003c\/td\u003e\n\u003ctd\u003eLess than -100dBv at max volume (103)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDynamic Range\u003c\/td\u003e\n\u003ctd\u003e122dB (AES17)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCrosstalk\u003c\/td\u003e\n\u003ctd\u003e-105dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGain\u003c\/td\u003e\n\u003ctd\u003eMain output: 18.5dB balanced output.\u003cbr\u003e(12.5dB SE output.) Record output: 0dB (Processor input: 0dB balanced out).\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Impedance\u003c\/td\u003e\n\u003ctd\u003e100K ohms Balanced, 50K ohms SE.\u003cbr\u003e8 Inputs – 4 balanced, 4 single-ended.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Impedance\u003c\/td\u003e\n\u003ctd\u003e600 ohms Balanced, 300 ohms SE Main (2), 20K ohms minimum load and 2000pF maximum capacitance. Outputs (3): 2 Main, 1 Record (XLR and RCA connectors).\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Polarity\u003c\/td\u003e\n\u003ctd\u003eNon-inverting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Input\u003c\/td\u003e\n\u003ctd\u003e16V RMS BAL, 8V RMS SE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated Outputs\u003c\/td\u003e\n\u003ctd\u003e2V RMS (1V RMS SE) into 200K ohm balanced load (maximum balanced output capability is 17V RMS at less than 0.5% THD at 1kHz).\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControls\u003c\/td\u003e\n\u003ctd\u003eRotary volume selector (103 steps) and rotary input selector. Push buttons: Power, Menu, Enter, Mono, Invert, Mute.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Supplies\u003c\/td\u003e\n\u003ctd\u003eElectronically regulated low and high voltage supplies. Automatic 45 sec. warm-up\/brown-out mute. Line regulation better than .01%.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Compliment\u003c\/td\u003e\n\u003ctd\u003e(4) 6H30P dual triode\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Requirements\u003c\/td\u003e\n\u003ctd\u003e105-125VAC 60Hz (200-250VAC 50\/60Hz) 130 watts maximum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandby\u003c\/td\u003e\n\u003ctd\u003e2W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eWidth: 19” (48 cm) Height: 6.5” (13.7 cm) Depth: 13.7” (34.8 cm) Handles extend 1.6” (4 cm) forward of the front panel Weight: 16.0 lbs. (7.2 kg) Net; 24 lbs. (10.9 kg) Shipping\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Audio Research","offers":[{"title":"Black","offer_id":67848735293809,"sku":"ARLS28SEBL","price":7320.0,"currency_code":"USD","in_stock":true},{"title":"Silver","offer_id":67848735326577,"sku":"ARLS28SESI","price":7320.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0923\/5215\/1921\/files\/L28se-silver-main.jpg?v=1792519195","url":"https:\/\/sliyden.store\/products\/audio-research-ls28se-line-stage-preamplifier","provider":"sliyden.store","version":"1.0","type":"link"}