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Andante & Vivace Plus

Reviewer: Srajan Ebaen
Financial interests: click here
Sources: Retina 5K 27" iMac (4GHz quad-core with Turbo boost, 32GB RAM, 3TB FusionDrive, OSX Yosemite. iTunes 14.4), PureMusic 3.02, Audirvana 3, Qobuz Hifi, Tidal Hifi, COS Engineering D1, Denafrips Terminator, Soundaware D300Ref as USB bridge/SD transport
Preamplifier: Vinnie Rossi L2 Signature with Elrog ER50; Nagra Classic, Wyred4Sound STP-SE Stage II, COS Engineering D1, Vinnie Rossi LIO (AVT module)
Power & integrated amplifiers: Pass Labs XA30.8; FirstWatt SIT1 monos, SIT3. F5, F6, F7; Goldmund/Job 225; Wyred4Sound mINT; Nord Acoustics NC500 monos; LinnenberG Audio Liszt; Bakoon AMP-13R; Simon Audio i5 & AIO
Loudspeakers: Audio Physic Codex; Acelec Model One; Cube Audio Nenuphar; EnigmAcoustics M1; Albedo Audio Aptica; EnigmAcoustics Mythology 1; Boenicke Audio W5se; Zu Audio Druid V, VI & Submission; German Physiks HRS-120; Eversound Essence; Fram Midi 150 & 120; sound|kaos Vox 3a & 3f [on review]; Aurai Audio M1 [on review] Cables: Complete loom of Allnic Audio ZL 3000; Zu Event; KingRex uArt double-header USB cables; Tombo Trøn S/PDIF; van den Hul AES/EBU; AudioQuest Diamond glass-fibre Toslink; Black Cat Cable redlevel Lupo; Ocellia OCC Silver
Power delivery: Vibex Granada/Alhambra on all source components, Vibex One 11R on amps/sub
Equipment rack: Artesania Audio Exoteryc double-wide 3-tier with optional glass shelves, Exoteryc Krion and glass amp stands
Sundry accessories: Acoustic System resonators
Room: 4 x 6m with high gabled beam ceiling opening into 4 x 8m kitchen and 5 x 8m living room, hence no wall behind the listening chairs
Review component retail: TBA

Multiply and populate the world. Man wrote the book, followed its mandate, then didn't know when to stop. In that scheme of things, AGD Production just got started. Being about upscale hifi not sex, overpopulation also won't ever be an issue. Unhealthy interest still could be. It simply won't have young men go blind, just deaf. Following the good book, AGD's portfolio is multiplying. After his Audion & Vivace monos whose fast-switching gallium-nitride Mosfet output stages pack inside 8-pin KT88 glass bulbs, designer Alberto Guerra now adds the Andante PreDac and a higher-power mono called Vivace Plus.

The original KT88 GaNTube of Audion & Vivace.

The switch-mode power supply of the 100-watt Vivace (200w/4Ω, 360w/2Ω) contains an inactive voltage bus. Once wired up to replace the lower voltage, Vivace can drive the bigger new KT150 for more power. Hello Vivace Plus. Owners of the standard Vivace can have theirs updated at the California factory. It rolls with Alberto Guerra's concept of modular solid-state amps.

Of course pure power amps still need voltage-trimmable signal to do their job.

The fully balanced direct-coupled Andante digital/analog companion preamp provides such signal from various sources. It's a 32-bit R2R DAC with network streaming, four analog inputs and three outputs. Passive volume utilizes a 256-stepped resistor matrix. There's HD AptX Bluetooth and DLNA, Roon, Tidal and MQA. By menu, input 1 can configure to either MC or MM phono. XMOS' XU208 USB transceiver supports up to 768kHz PCM and 24'576MHz native DSD512 on Linux/Windows, 12'288MHz DSD256 via DoP. RJ45 connects directly to the network. One box does all conceivable modern sources, file and resolution types with touch-sensitive controls, Apple remote and universal 90-264VAC 50/60Hz voltage input. Menu items include balance control, phase inversion, display brightness, MC/MM phono selection and four digital filter options including the default bypass plus dither and de-emphasis.