A compact bookshelf loudspeaker system from Sony's APM series. It uses planar drivers with aluminum honeycomb diaphragms in a bass-reflex enclosure.
Overview
It's a 2-way design in a bass-reflex enclosure. Both the low and high frequency drivers are planar, with aluminum honeycomb diaphragms. The driver and crossover construction got careful attention, which is what you'd expect from Sony's APM-series engineering. The speakers are known for build quality and are still sought after by vintage audio enthusiasts. The original foam surrounds tend to deteriorate with age.
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
These speakers commonly need their foam surrounds replaced because of age. Third-party suppliers sell replacement kits, though some aftermarket foams have failed early. 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.
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