JBL 2118H/2118J
¥ 40,000 (1 unit, around 1984)
Commentary
A 20 cm cone type mid-range / woofer developed for mid-low range.
It is installed in the 4612 and 4612B Cabaret series SR system speakers.
It uses low-distortion SFG magnetic circuit, long voice coil, newly designed suspension, die-cast frame, etc.
The 2118H has two variations : the 2118H has an 8-ohm design and the 2118J has a 16-ohm design.
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Model Rating
| Type | 20 cm Cone Mid-Woofer |
| Impedance | 2118H : 8 Ω 2118J : 16 Ω |
| Allowable input (continuous program) | 50W |
| Sound pressure level | 97dB/W/m |
| Frequency band | 70 Hz to 7 kHz |
| fo | 85Hz |
| Magnetic flux density | 10,500Gauss |
| Enclosure volume | 14 ~ 28 liters |
| External dimensions | Diameter 230x Depth 98 mm |
| Weight | 3.9kg |
| Thiele-Small Parameters | |
| fs(Hz) | 85 |
| Re(Ω) | 5.5(10.3) |
| Qts | 0.35 |
| Qms | 2.4 |
| Qes | 0.40 |
| Vas(L) | 14 |
| SD(m2) | 0.0218 |
| Xmax(mm) | 3.0 |
| VD(cm2) | 65 |
| Le(mH) | 0.6(0.85) |
| Η0(Half space)(%) | 2.1 |
| Pe(max) (W) (continuous sine wave input) | 100 |
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