YAMAHA JA-6681/JA-6681B
¥ 60,000 (1 piece, around 1980)
Commentary
Professional series mid-range horn driver unit with high input resistance and high cost performance with the same basic design as JA-6670.
The diaphragm is made of 66 mm special aluminum alloys, and the edge is etched with 0.15 mm copper-beryllium alloy to prevent failure due to fatigue.
The difference between JA 6681 and JA 6681 b is the impedance, JA 6681 is 8 Ω and JA 6681 b is 16 Ω.
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Model Rating
| Type | Horn driver unit for mid-range |
| Nominal impedance | JA-6681 : 8 Ω JA-6681B : 16 Ω |
| Playback frequency band | 300 Hz to 12 kHz |
| Recommended bandwidth | 500 Hz or more |
| Rated input | 20W |
| Max Input | 40W |
| Output sound pressure level | 107dB/W · m |
| Diaphragm | Dome shaped aluminum alloy |
| Voice coil diameter | 66.6 φ mm |
| Equalizer | Zinc Die Cast (4 Slit) |
| Magnet | Ferrite, 1.1 kg |
| Magnetic flux density | 17,500gauss |
| Total flux | 110,000maxwell |
| Applicable Horn | H-1230 (requires AD-3500) H-2230 |
| Throat diameter | 35mm |
| External dimensions | Diameter 165 mm x Height 144.4 mm |
| Weight | 6.75kg |