Marantz 6G (circa 1972)
Little is documented about the Marantz 6G, a Japanese-market bookshelf speaker from around 1972. What the record shows is a substantial two-way bass-reflex design. At 18.1 kg and 633 mm tall, it was no lightweight shelf speaker. It paired a 25 cm cone woofer with a 4.5 cm cone tweeter, rated at 30W input with an 87 dB/W/m sensitivity and a frequency response of 35 Hz to 20,000 Hz ±5 dB. Impedance was 8 ohms. The original price was ¥44,900 per unit.
The engineering notes that survive point to Marantz paying unusual attention to driver behavior. The woofer cone was coated with a special elastic agent from the outer circumference to the edge, specifically to reduce midrange distortion - the region the designers considered most critical for audibility. The tweeter was an "edgeless" type. Instead of a paper or cloth surround, the cone paper was connected directly to the frame via a thin film of coated elastic agent. That avoids the mechanical noise conventional surround materials can introduce.
Beyond these specifications, the record is thin. No production years are confirmed (the "around 1972" dating comes from the price annotation), and no crossover frequency, cabinet material, or terminal types are documented. A Yahoo auction listing for a "Marantz 6-G" unit gives slightly different dimensions (36 × 64.5 × 29 cm) than the audio database figures (353 × 633 × 285 mm). The gap is likely due to measurement conventions or the optional grille, and it's not worth resolving without better sources. A separate "Marantz 6G MK-Ⅲ" variant exists and is treated here as a different model.
No reception commentary, collectibility data, or common maintenance issues have surfaced for the 6G specifically.
Known Specifications
- Type: 2-way, 2-speaker, bass-reflex, bookshelf
- Woofer: 25 cm cone type
- Tweeter: 4.5 cm cone type (edgeless)
- Impedance: 8 Ω
- Frequency response: 35 Hz – 20,000 Hz ±5 dB
- Rated input: 30W
- Sensitivity: 87 dB/W/m
- Distortion: 0.5% or less (94 dB SPL at 1m, 50/500/5k/12.5 kHz, 2nd and 3rd harmonic average)
- Dimensions: 353W × 633H × 285D mm
- Weight: 18.1 kg
- Original price: ¥44,900 (1 unit, circa 1972)
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