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stello ai500se Integrated Amplifier (Solid State) STELLO AI500 SE INTERGRATED AMPLIFIER IN PERFECT CONDITION ALSO EVERYTHING WORKS AS IT SHOULD THIS IS A VERY UNDERATED AMPLIFIER FROM APRIL MUSIC IN SOUTH KOREA 150 WATTS @8OHMS 300 WATTS @4 OHMS THE SE VERSION HAS THE FOLLOWING UPDATES COMPARED TO THE STANDARD VERSION THE USE OF HIGHER PERFORMANCE INPUT BUFFER HIGHER PERFORMANCE OP AMPS BUFFER STAGE WAS ADDED TO THE VOLUME CONTROL IMPLEMENTED ADDITIONAL FINE TUNING OF POWER AMP STAGES DAC PCM UP TO 24-192 VIA USB THIS IS AN AMPLIFIER THAT YOU CAN LISTEN TOO FOR HOURS WITHOUT FATIGUE INCLUDING
Are you getting a fair entry price, or paying too much for a heavy, well-sorted amp that still has real muscle? A$2,500 looks fair to slightly strong, not cheap: the Ai500 launched at around A$5,100 new at its USD retail of $3,495, and used listings around the A$2,400 mark suggest this asking sits close to normal market territory rather than below it.
What keeps it interesting is the combination of 150 W/ch into 8 ohms, 300 W/ch into 4 ohms, and a robust MOSFET/Class AB design with a big toroidal supply, so it should sound authoritative and controlled with tougher speakers. If the unit is clean, fully functional, and includes the original remote or accessories, it’s a solid buy for someone wanting a serious integrated without moving into modern boutique pricing; at this level, just confirm all inputs work and there’s no channel imbalance or relay noise.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Stello is a hi-fi brand from South Korea, launched by April Music, a company founded in 1998 in Seoul. April Music, known for its skilled engineering team that includes musicians, established Stello as one of its three core lines—alongside the digital-focused Aura and power amplification-oriented Eximus—initially targeting personal audio enthusiasts. The brand debuted with the acclaimed HP100 (also known as H100) headphone amplifier and preamp, building a foundation in compact, high-quality components assembled in Korea with some enclosures sourced from California.
Stello specializes in digital audio essentials and amplification, including standout products like the CDT100 and DA100 DACs, USB DACs such as the U3, CD transports like the CDT200, and integrated amplifiers like the Ai500. Its 100 Series emphasizes lifestyle-sized designs that bridge traditional hi-fi with PC-based music playback, delivering transparent, open sound through reliable engineering. The lineup avoids speakers or turntables, focusing instead on sources, DACs, and amps that integrate seamlessly into modern setups.
Positioned as an affordable high-end contender, Stello earns praise for punching above its price with extraordinary build quality and musicality, often rivaling pricier rivals. It challenges preconceptions about Korean audio—proving South Korea's prowess beyond consumer electronics—while serving as a gateway for discerning buyers seeking value-driven performance without boutique excess. April Music's OEM work for other high-end marques underscores its technical credibility in the global market.
See all Stello listings on RADAR.
