| Specification | Details |
| Brand | JCALLY |
| Model | JM7 MAX |
| Product Type | Portable USB DAC & Headphone Amplifier |
| DAC Chipset | Conexant CX31993 |
| Op-Amp Chipset | SGM8262 |
| PCM Decoding | Up to 32-bit / 384kHz |
| Input Interface | USB Type-C Male |
| Output Interface | 3.5mm Single-ended Female Audio Jack |
| Output Power | ~228mW @ 16Ω / ~118mW @ 32Ω |
| Output Impedance | ~0.50Ω (@ 32Ω) |
| Signal-to-Noise Ratio (SNR) | ~115 dB (32Ω, A-weighted) |
| Total Harmonic Distortion + Noise (THD+N) | ≈ 0.0025% (32Ω / 300Ω) |
| Cable Structure | Fixed 8-strand, 448-core silver-plated copper wire |
| Chassis Material | 5-Axis CNC-machined aluminum alloy with transparent visual window |
| Overall Length | ~115 mm (±10 mm) |
| Weight | ~47 g (±5 g) |
| System Compatibility | Android, iPadOS/iOS, Windows 10+, macOS (UAC2.0 plug-and-play) |
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