| Year | 1978 | 1987 | 1987 | 1987 | 1993 | 1995 |
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| Bass driver | 18cm woofer JA1801 (JA180100) | JA1801(or JA1801A / XN542AA1)? *** | LF: JA1801(A?) 18cm (7") cone | LF: JA1801(A?) 18cm (7") cone | 18cm cone woofer | 18cm cone woofer |
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| High driver | JA0518 soft dome tweeter | JA0518A 3.5cm 1-3/8" soft dome | HF: JA0518A 3.5cm 1-3/8" soft dome | HF: JA0518A 3.5cm 1-3/8" soft dome | 3.5cm dome tweeter | 3cm dome tweeter |
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| Crossover frequency | 2Khz (12dB/octave) | 2Khz (12dB/octave) | 2Khz (12dB/octave) | 2Khz | 2Khz (12dB/octave) | 2kHz（－12dB/oct） |
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| Frequency response | Max 85Hz | 60Hz - 20Khz | 60Hz - 20Khz | 60Hz - 20Khz | 60Hz...20Khz | 43Hz - 30Khz (-10dB) (43Hz - 20Khz) |
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| Nominal impedance | 8 Ohm | 9 Ohm | 8 Ohm | 8 Ohm | 8 Ohm [6 Ohm?] | 6 Ohm |
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| Nominal power input | 25W | 60W | 60W | 60W | 60W | 60W |
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| Maximum power input | 50W | 120W | 120W | 120W | 120W [180W?] **** | 180W |
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| SPL (sensitivity) | 90 dB/m-W | 90 dB/m-W | 90dB (1W, 1m on axis) | 90dB (1W, 1m on axis) | 90 dB/W/m | 90 dB/W/m |
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| Dimensions (metric) | 382(H) x 215(W) x 199(D)mm | 21.5 x 38.2 x 19.9cm | 382 x 215 x 198mm | 381.5mm x 215mm x 200.5mm | 21.5 x 38.2 x 19.9cm | 215mm x 382mm x x 255mm |
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| (imperial) | 15" x 8-1/2" x 7-4/5" | 8-7/16" x 15-1/16" x 7-13/16" | 15" x 8-1/2" x 7-7/8" | 15" x 8.5" x 7.9" | 8-7/16" x 15-1/16" x 7-13/16" | 8-7/16" x 15" x 10" |
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| Enclosure Comments | 10.4 liter, sealed | Real wood, black finish | 10.4 liter, sealed | 10.4 liter, acoustic-suspension | Magnetic shielding type (EIAJ) | Bass reflex system, Magnetically Shielded |
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| Weight (1 speaker) | 6kg (13lbs 4oz) | 6kg (13lbs 4oz) | 6.3 kg (13lbs 14oz) | 6.5kg (14lbs 5oz) | 7kg (15lbs 6oz) | 9kg (20lbs ) [7kg] |
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| Placement | Verticle, bookshelf | Verticle, bookshelf | Horizontal, bookshelf | Horizontal, mounted | Verticle, bookshelf | Verticle, mounted |
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| List price* (pair) | 50,000¥ (≈$1050, 1978) | 55,000¥ (≈$770, 1987) | 51,200¥ (≈$720, 1987) | 60,000¥ (≈$840, 1987) | 67,200¥ (≈$740, 1993) | 71,400¥ (≈790, 1996) (but sold individually) |
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| Current price** (pair) | $400-550 | $500-800 | $500-800 | $500-800 | $700-900 | $600-700 |
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