Marantz 4G (circa 1972)
The Marantz 4G is a compact, two-way sealed bookshelf speaker from the early 1970s. It was originally priced at ¥29,900 per unit. Documentation is thin. No production years, lineup positioning or period reviews have survived in the accessible record. What is known comes down to the engineering details.
The woofer is a 20 cm cone type. Marantz gave the cone paper a curved profile to extend response cleanly up to 5 kHz without compromising directional characteristics. The woofer surround is a urethane-based material. The tweeter is a 4.5 cm cone type, described as "edgeless." It has no paper or cloth surround. The cone connects directly to the frame through a thin film of coated elastic agent, a choice made to avoid the mechanical noise Marantz felt those materials introduced.
Rated input is 15W into 8 ohms. The published frequency range is 40 Hz to 18,000 Hz (±5 dB), and sensitivity is 89 dB/W/m. Distortion is specified at 0.9% or less, measured as the average of 2nd and 3rd harmonic distortion at 94 dB SPL across 50 Hz, 500 Hz, 5 kHz, and 12.5 kHz. The cabinet measures 279 mm wide, 474 mm high, and 211 mm deep, and weighs 9.1 kg.
- Type: 2-way, 2-speaker, sealed enclosure, bookshelf
- Woofer: 20 cm cone, urethane surround
- Tweeter: 4.5 cm cone, edgeless design
- Impedance: 8 Ω
- Rated input: 15W
- Frequency range: 40 Hz – 18,000 Hz (±5 dB)
- Sensitivity: 89 dB/W/m
- Dimensions: 279 × 474 × 211 mm (W×H×D)
- Weight: 9.1 kg
- Original price: ¥29,900 (1 unit, circa 1972)
No crossover frequency is documented, and no owner reviews or market pricing have surfaced. Surround re-foam repair kits exist for the 4G, which tells you the urethane surrounds are aging and will eventually need attention.
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