{"product_id":"agd-alberto-guerra-designs-gran-vivace-mkiii-monoblock-amplifiers-hybrid-magic","title":"AGD (Alberto Guerra Designs) Gran Vivace MKIII Monoblock Amplifiers - Hybrid Magic!","description":"\u003cp\u003e\u003cem\u003e\u003cstrong\u003eA Personal Note on the AGD Gran Vivace MKIV from company owner, Alberto Guerra\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\"From the very beginning, my goal has been simple: to bring together perfection and beauty in the art of audio reproduction. Every AGD design is a continuation of that pursuit—an ongoing dialogue between technology and music.\u003c\/p\u003e\n\u003cp\u003eThe AGD GaNTube™ platform reflects this journey. Now in its fourth generation since its introduction in 2020, the new GaNTube120KT MKIII represents a meaningful step forward. At its core is a new generation of high-voltage GaN HEMT devices, combined with refined thermal management and an improved low-noise linear regulator stage—each element carefully engineered to elevate performance without compromising musical integrity.\u003c\/p\u003e\n\u003cp\u003eThe Gran Vivace MKIII delivers an even deeper sense of control and authority when compared to other \"similar\" amplifiers. The latest GaNTube implementation, together with a newly developed 100% GaN-based power supply—capable of delivering up to 6kW peak power—allows the MKIV to respond with remarkable speed and composure, even under the most demanding conditions.\u003c\/p\u003e\n\u003cp\u003eThe result is a greater clarity, lower distortion, and a more effortless presentation. Music unfolds with enhanced transparency and dynamic precision, revealing nuance and space with a natural, unforced quality and holographic imaging that define the AGD sound.\u003c\/p\u003e\n\u003cp\u003eEvery detail has been considered to preserve what matters most: a sense of realism, emotional connection, and ease, while at the same time, the Gran Vivace MKIV retains the elegance, simplicity, and upgradeability that define the AGD philosophy.\"\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e-Alberto Guerra\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cem\u003eEvolution of Speed, Control, and Musical Truth\u003c\/em\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Gran Vivace platform has always occupied a unique position in high-end amplification,  not  simply as a powerful Class-D design, but as a deliberate rethinking of how modern power electronics can serve music.\u003c\/p\u003e\n\u003cp\u003eWith the Gran Vivace MKIII, that philosophy reaches a new level of maturity, where engineering refinement and sonic expression converge more seamlessly than ever before. At the heart of the Gran Vivace architecture lies AGD’s distinctive GaNTube™ platform, a modular approach that integrates the entire power stage into a compact glass enclosure. This is not merely an aesthetic gesture; it is a deliberate engineering choice aimed at maintaining consistency across revisions and delivering unprecedented easy of upgrade.\u003c\/p\u003e\n\u003cp\u003eEarlier generations of the Gran Vivace (and Audion) already demonstrated the advantages of GaN (Gallium Nitride) switching devices and the Gran Vivace MKIII builds upon this foundation with a new generation high-voltage GaN HEMT MOSFETs, new PCB layout optimized for speed and thermal efficiency, and improved device integration and high-reliability components.\u003c\/p\u003e\n\u003cp\u003eThe system continues to operate at ~800 kHz PWM switching frequency, a regime that pushes switching artifacts well beyond the audible band and allows for a more benign output filtering process.\u003c\/p\u003e\n\u003cdiv\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cem\u003eValues\u003c\/em\u003e\u003c\/div\u003e\n\u003cdiv\u003eMaximum Output Power (CEA-2006), 4Ω\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e400W\u003c\/div\u003e\n\u003cdiv\u003eTHD+N 10W\/1KHz\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e\u0026lt;0.0075%\u003c\/div\u003e\n\u003cdiv\u003eSignal to Noise ratio at 1kHz\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e\u0026gt;110 db\u003c\/div\u003e\n\u003cdiv\u003eBandwidth ±0.5dB\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e20Hz÷20KHz\u003c\/div\u003e\n\u003cdiv\u003eEfficiency%\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e\u0026gt;94%\u003c\/div\u003e\n\u003cdiv\u003eOutput Noise (A-weighted)\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e≤ 45μV\u003c\/div\u003e\n\u003cdiv\u003ePWM Frequency\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e800kHz\u003c\/div\u003e\n\u003cdiv\u003eDynamic Range\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e120dB\u003c\/div\u003e\n\u003cdiv\u003eDimension\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e11\"x11'x5\" (279x279x127mm)\u003c\/div\u003e\n\u003cdiv\u003eWeight\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e22lbs (10kg)\u003c\/div\u003e\n\u003cdiv\u003eInput Voltage\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e110-240V (user selectable)\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eVery impressive stats to say the least! So, these are the most authoritative amplifiers we've encountered in a Class D operating platform. They are truly spectacular in every way. Their grip on bass drivers is second to none. You'll swear you are hearing 100lb Class A fire breathers but, alas, these are 28lbs each and throw zero discernible heat. They preform amazingly and used here with the new SPL preamp, is a powerful, visually spectacular and incredibly dynamic power package. These have been lightly used in a very high end system and our techs state the build quality is uber-impressive. Complete with flight cases, AGD TOTL power cords, tube cases and a set of spare set of AGD KT-88 GAN Tubes. Solid 8+ aesthetic with only the slightest signs of use\/wear. - WOW!\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eCome listen to these spectacular hybrid mono blocks here in Andover\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cem\u003e\u003cstrong\u003eAGD (Alberto Guerra Designs) Gran Vivace MKIII Monoblock Amplifiers: $18,789.00 plus shipping and sales tax when \u003c\/strong\u003e\u003cb\u003eapplicable\u003c\/b\u003e\u003c\/em\u003e\u003c\/div\u003e","brand":"Holt Hill Audio","offers":[{"title":"Default Title","offer_id":43605838725187,"sku":null,"price":18799.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2197\/6387\/files\/PhotoJul292026_115729AM.jpg?v=1785343940","url":"https:\/\/holthill.com\/products\/agd-alberto-guerra-designs-gran-vivace-mkiii-monoblock-amplifiers-hybrid-magic","provider":"Holt Hill Audio","version":"1.0","type":"link"}