| Model ID | SX-680/S/G |
| Form Factor | Standard Width |
| Signal Path | Analog Hardware |
| Dimensions | 43.7 × 14.2 × 31.5 cm (W × H × D) |
| Weight | 19.6lbs |
| Power | 110V/120V/220V/240VAC (Switchable), 50/60Hz 280W (Max) |
| Frequency Response | 5Hz-100kHz ±3dB |
| Power Output (20Hz-20kHz, 8/4Ω) | 30W/37W |
| THD (Rated Output, 8Ω) | ≤0.1% |
| THD (15W, 8Ω) | ≤0.08% |
| THD (1W, 8Ω) | ≤0.05% |
| IMD (Rated Output, 8Ω, 50Hz:7kHz) | ≤0.1% |
| IMD (15W, 8Ω, 50Hz:7kHz) | ≤0.08% |
| IMD (1W, 8Ω, 50Hz:7kHz) | ≤0.05% |
| Damping Factor (20Hz-20kHz, 8Ω) | 25 |
| Input Sensitivity (Phono) | 2.5mV |
| Input Impedance (Phono) | 50kΩ |
| Phono Overload Level (1kHz, THD 0.1%) | 200mV |
| Input Sensitivity (Aux) | 150mV |
| Input Impedance (Aux) | 50kΩ |
| Input Sensitivity (Tape Play 1,2) | 150mV |
| Input Impedance (Tape Play 1,2) | 50kΩ |
| Output Level (Tape 1,2) | 150mV |
| Frequency Response (RIAA EQ) | 30Hz-15kHz ±0.5dB |
| SNR (Phono, IHF, Short-Circuited, A network) | 75dB |
| SNR (Aux, Tape, IHF, Short-Circuited, A network) | 90dB |
| FM Sensitivity (Mono) | 10.8dBf (1.9μV) |
| FM Sensitivity (Mono, 50dB Quieting) | 16.7dBf (3.8μV) |
| FM Sensitivity (Stereo, 50dB Quieting) | 36.7dBf (38μV) |
| FM SNR (65dBf, Mono) | 80dB |
| FM SNR (65dBf, Stereo) | 70dB |
| FM Distortion (65dBf, 100Hz, Mono) | 0.07% |
| FM Distortion (65dBf, 100Hz, Stereo) | 0.15% |
| FM Distortion (65dBf, 1kHz, Mono) | 0.07% |
| FM Distortion (65dBf, 1kHz, Stereo) | 0.15% |
| FM Distortion (65dBf, 6kHz, Mono) | 0.2% |
| FM Distortion (65dBf, 6kHz, Stereo) | 0.25% |
| FM Capture Ratio | 1.0dB |
| FM Alternate Channel Selectivity | 60dB |
| FM Spurious Response Ratio | 65dB |
| FM Image Response Ratio | 65dB |
| FM IF Response Ratio | 90dB |
| FM AM Suppression Ratio | 50dB |
| FM Muting Threshold | 19.2dBf (5μV) |
| FM Stereo Separation (1kHz) | 45dB |
| FM Stereo Separation (30Hz-15kHz) | 30dB |
| FM Subcarrier Production Ratio | 50dB |
| FM SCA Rejection Ratio | 65dB |
| Frequency Response (FM) | 30Hz-15kHz +0.2dB, -1.0dB |
| Input Impedance (Antenna, Balanced) | 300Ω |
| Input Impedance (Antenna, Unbalanced) | 75Ω |
| AM Sensitivity (IHF, Ferrite Antenna) | 300μV/m |
| AM Sensitivity (IHF, External Antenna) | 15μV |
| AM Selectivity | 26dB |
| AM SNR | 50dB |
| AM Image Response Ratio | 40dB |
| AM IF Response Ratio | 40dB |
| Notes | U.S. Military model. |
