Etymotic Research Tuberphone ER-2 specifications
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| Specification | Value |
|---|---|
| Bandwidth | 16 kHz |
| Isolation between ears | 70+ dB |
| External noise exclusion | 30+ dB |
| Ear coupling | Convenient with multiple eartip options |
| Diameter of sound-delivery tubes | Small, constant (1.35 mm ID x 2.16 mm OD) |
| 1 kHz Sensitivity | 100 dB SPL for 1.0 Volt (100 mW AC Drive; limits ±3 dB) |
| Impedance | 10 ohms, nominal (12 ohms at 100 Hz; 8 ohms at 20 kHz) |
| Safe Operating Limits | Maximum continuous sine wave drive: 2.5 V RMS |
| Maximum Peak Voltage | For 1% duty cycle: 20 Volts |
| Acoustic Polarity | + Electric (small pin) → + Acoustic |