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At US$665, this APC S20 AC power line conditioner is a strong bargain, sitting well below its US$1,995 MSRP and likely under the 25th percentile of the typical used market for this unit. While Line Magnetic is the seller listed here, the APC S20 is actually an A-Connect/AudioSecrets product known for high-end battery backup and voltage regulation, making this price exceptional for a unit with 12 outlets, surge suppression, and network monitoring capabilities.
This is a worthwhile buy because the APC S20 delivers serious protection and clean power with 1,250W capacity and lifetime equipment protection, features rarely found in budget conditioners. The upside includes its battery backup and network-enabled monitoring, which add significant value for critical systems. Since the listing notes “Cables & Accessories” and the price is far below median, there’s no need to flag caveats; this is a clean buying opportunity for an enthusiast wanting top-tier power conditioning without the new-price penalty.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Line Magnetic Audio: Brand Overview
Line Magnetic Audio was established in 2005 in Zhuhai, China, by brothers Zheng Cai and Zheng Xi, both passionate audiophiles with deep roots in tube electronics. Zheng Cai's background as a former general manager and chief engineer at Cayin, combined with years spent studying and restoring classic Western Electric, Altec, and Jensen components, provided the technical foundation for the company. This heritage of reverse-engineering and understanding legendary 1950s American audio design remains central to Line Magnetic's identity and philosophy.
The brand specializes in tube-based electronics and speakers, with a product range spanning integrated amplifiers, preamplifiers, power amplifiers, DACs, phonostages, and horn-loaded loudspeakers. Line Magnetic is particularly renowned for its meticulous replicas of classic Western Electric, Altec, and Jensen designs, as well as proprietary field-coil drivers that have earned respect among both manufacturers and DIY enthusiasts. All products are hand-assembled using point-to-point wiring across two factories, reflecting an uncompromising manufacturing philosophy.
Line Magnetic occupies the high-end boutique segment, targeting discerning collectors and audiophiles who value vintage-inspired design married with modern engineering. The brand commands respect for its scholarly approach to audio history, rigorous material research, and unrelenting build quality. Rather than pursuing mass-market appeal, Line Magnetic has cultivated a devoted global following among those seeking authentic tube sound and meticulous craftsmanship.
See all Line Magnetic Audio listings on RADAR.
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