{"product_id":"sugden-masterclass-la-4-class-a-line-preamplifier","title":"Sugden Masterclass LA-4 Class A Line Preamplifier","description":"\u003ch1\u003eSugden Masterclass LA-4 – Class A Line Preamplifier\u003c\/h1\u003e\n\n\u003cp\u003e\u003cstrong\u003eThe Sugden Masterclass LA-4 is a high-quality active line preamplifier designed for refined, fully analogue stereo systems.\u003c\/strong\u003e Combining a sophisticated Class A output stage with relay-controlled input and output switching, it provides precise system control while preserving the tonal character, dynamic expression and natural flow of the source material.\u003c\/p\u003e\n\n\u003ch2\u003eOverview\u003c\/h2\u003e\n\n\u003cp\u003e\nThe LA-4 has been developed as the natural control centre for Sugden Masterclass and Sapphire power amplifiers, including the SPA-4 and MPA-4. Its high-gain architecture provides confident control over a connected power amplifier, while carefully selected transistors and capacitors support clean signal preservation throughout the circuit.\n\u003c\/p\u003e\n\n\u003cp\u003e\nEach gain stage is powered by a current-shunt differential power supply. This approach is designed to support rapid transient response and maintain composure during demanding musical passages. Gold-plated circuit boards and relay switching further reflect Sugden’s focus on signal integrity and long-term reliability.\n\u003c\/p\u003e\n\n\u003ch2\u003eKey Benefits\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNatural system control:\u003c\/strong\u003e the active Class A output stage is designed to preserve tonal balance and low-level detail.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlexible analogue connectivity:\u003c\/strong\u003e line-level, tape, balanced and bypass inputs accommodate a wide range of source and system configurations.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBalanced integration:\u003c\/strong\u003e balanced input and output connections suit premium pre\/power systems.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConvenient operation:\u003c\/strong\u003e motorised remote volume control allows precise adjustment from the listening position.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHandcrafted construction:\u003c\/strong\u003e Masterclass components are assembled in Sugden’s Yorkshire factory.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003eActive Class A line preamplifier\u003c\/li\u003e\n  \u003cli\u003eFour line-level inputs\u003c\/li\u003e\n  \u003cli\u003eOne tape input\u003c\/li\u003e\n  \u003cli\u003eOne balanced input\u003c\/li\u003e\n  \u003cli\u003eOne bypass input\u003c\/li\u003e\n  \u003cli\u003eTwo line-level outputs\u003c\/li\u003e\n  \u003cli\u003eOne fixed tape output\u003c\/li\u003e\n  \u003cli\u003eOne balanced output\u003c\/li\u003e\n  \u003cli\u003eRelay switching for inputs and outputs\u003c\/li\u003e\n  \u003cli\u003eMotorised RC5-compatible remote volume control\u003c\/li\u003e\n  \u003cli\u003eTape output defeat function\u003c\/li\u003e\n  \u003cli\u003eGold-plated circuit boards\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eIdeal For\u003c\/h2\u003e\n\n\u003cp\u003e\nThe Sugden Masterclass LA-4 is intended for serious two-channel systems using a separate power amplifier. It is particularly well suited to owners of the Sugden SPA-4 or MPA-4, as well as listeners who want a premium analogue preamplifier without digital processing, streaming or unnecessary system complexity.\n\u003c\/p\u003e\n\n\u003cp\u003e\nIts bypass input also makes it relevant for systems where a dedicated stereo setup shares power amplification with another source or control component.\n\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e\u003cstrong\u003eProduct type\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd\u003eActive Class A line preamplifier\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e\u003cstrong\u003eInputs\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd\u003e4 × line level, 1 × tape, 1 × balanced, 1 × bypass\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e\u003cstrong\u003eOutputs\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd\u003e2 × line level, 1 × fixed tape, 1 × balanced\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e\u003cstrong\u003eInput sensitivity\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd\u003e100 mV for 1 V output\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e\u003cstrong\u003eMaximum output\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd\u003e10 V\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e\u003cstrong\u003eFrequency response\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd\u003e15 Hz–30 kHz, ±0.1 dB\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e\u003cstrong\u003eBandwidth\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd\u003e6 Hz–300 kHz\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e\u003cstrong\u003eSignal-to-noise ratio\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd\u003eGreater than 90 dB\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e\u003cstrong\u003eDistortion\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd\u003eLess than 0.006% at 1 kHz, 1 V output\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e\u003cstrong\u003eDimensions (H × W × D)\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd\u003e75 × 430 × 350 mm\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd\u003e7 kg\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e\u003cstrong\u003eRemote control\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd\u003eMotorised volume, RC5 compatible\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e\u003cstrong\u003eManufacture\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd\u003eHandmade in Yorkshire, England\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhy We Selected This Product\u003c\/h2\u003e\n\n\u003cp\u003e\nAt ExclusivIT, we appreciate preamplifiers that focus on the essential task of managing an analogue system without imposing unnecessary complexity. The LA-4 offers the connectivity required by a serious stereo setup while maintaining a disciplined, carefully engineered signal path.\n\u003c\/p\u003e\n\n\u003cp\u003e\nIts combination of Class A operation, balanced connectivity, bypass input and substantial output capability makes it a particularly coherent partner for Sugden’s Masterclass power amplifiers. For listeners building a long-term pre\/power system around musical naturalness and understated British engineering, the LA-4 deserves close consideration.\n\u003c\/p\u003e","brand":"SUGDEN AUDIO","offers":[{"title":"Titanium","offer_id":54644472611139,"sku":"SUGDEN-MSLA4-T","price":5800.0,"currency_code":"EUR","in_stock":true},{"title":"Graphite","offer_id":54644472643907,"sku":"SUGDEN-MSLA4-G","price":5800.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0788\/2080\/2883\/files\/1ba66a_77c142dc5b7a42d8b1e7b5d98a66b565.avif?v=1784297888","url":"https:\/\/www.exclusivit.eu\/products\/sugden-masterclass-la-4-class-a-line-preamplifier","provider":"ExclusivIT","version":"1.0","type":"link"}