Sony APM 550AV
A compact bookshelf speaker system from Sony, with anti-magnetic construction and built-in protection circuitry, made for high-fidelity audio.
Overview
The Sony APM 550AV is a bookshelf speaker system made by Sony. Multiple sources identify it by its exact model name. It was originally priced at ¥19,500 around 1986. It is a 2-way, 2-speaker bass reflex system. The anti-magnetic construction reduces interference in audio and video setups. A built-in automatic recovery type protection circuit guards against overload.
Specifications
| Model Rating Method | 2-Way, 2-Speaker, Bass Reflex System, Bookshelf Type, Anti-Magnetic Type |
| Unit For low band | 144 cm² Plane type |
| Unit For high pass | 6 cm cone type |
| Playback frequency band | 50 Hz to 20000 Hz |
| Output sound pressure level | 89dB/W/m |
| Maximum instantaneous input level | 100W |
| Rated input level | 50W |
| External dimensions | Width 250x Height 410x Depth 220 mm |
| Weight | 6.2kg (audio-database.com) vs 11kg (Instagram post by blantik_antik) |
Design
The APM 550AV uses a 2-way speaker configuration with an anti-magnetic type APM unit. The built-in automatic recovery type protection circuit prevents damage during high-power operation.
Market
Listings from September 2025 and January 2026 show current market prices of 1.8 million and 3.8 million Indonesian Rupiah, respectively. One unit was described as "Full original" with normal operation and clean condition. A YouTube repair video points to woofer voice coil issues, which suggests a known maintenance point on aging units.
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