A compact bookshelf loudspeaker system from Sony’s APM series, featuring planar drivers with aluminum honeycomb diaphragms and a bass-reflex enclosure.
Overview
It uses a 2-way design with a bass-reflex enclosure and features planar drivers for both low and high frequencies, employing aluminum honeycomb diaphragms. These speakers were built with attention to detail in driver and crossover construction, reflecting Sony's APM-series engineering. Known for their build quality, they remain sought after by vintage audio enthusiasts, though original foam surrounds are prone to deterioration over time.
Specifications
| Type | 2-Way, 2-Speaker, Bass Reflex System, Bookshelf Type |
| Frequency Response | 45 Hz ~ 20000 Hz |
| Sensitivity | 89dB/W/m |
| Impedance | 6 Ω |
| Power Handling | 80W |
| Peak Input | 160W |
| Crossover Frequency | 2kHz |
| Dimensions (W×H×D) | 225 × 390 × 220 mm |
| Weight | 6.3kg |
Design
This 2-way speaker system features a flat woofer with an aluminum honeycomb diaphragm equivalent to 16 cm for the low frequency range and a planar tweeter with an aluminum honeycomb diaphragm equivalent to 4 cm for the high frequency range. The enclosure uses a bass-reflex structure to enhance low-frequency response.
Market
The speakers are noted to commonly require foam surround replacement due to age-related deterioration. Replacement kits are available from third-party suppliers, though some aftermarket foams have shown premature failure. As of February 2026, a pair was listed for CHF 350 on HifiShark. In 2009, a used pair was offered with a Sony receiver for around £200.
eBay Listings
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