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This US$30 asking price for a lot of two RDL ST-MX3 mixing amplifiers is an undeniable bargain, sitting far below the 25th percentile of US$58 for comparable used listings and drastically under the median of US$283. Even treating the single-unit new retail range of roughly US$185–US$240 as a secondary anchor, acquiring two units for US$30 represents exceptional value, effectively costing US$15 per module.
The RDL ST-MX3 is a rugged, professional-grade 3-channel line-level mixer prized in installed audio for its individual input gain adjustments and reliable 24 Vdc operation. These units are built to last, often found in broadcast and commercial installations where they mix three inputs cleanly without noise. At this price, the upside is immediate: you get two functional mixers for a sum that barely covers shipping, making this a high-priority buy for anyone needing reliable analog mixing or looking to stock spare modules for a system.
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.
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