When evaluating a Dipa, you must prioritize Total Harmonic Distortion (THD), which should ideally be <0.05% for high-fidelity sound. The Signal-to-Noise Ratio (SNR) should be above 100dB to ensure clear audio output. Additionally, verify the Power Efficiency, as Class D digital amplifiers should achieve over 90% efficiency, significantly reducing heat dissipation compared to traditional Class AB models. Ensure the unit supports multiple impedance loads (2Ω, 4Ω, 8Ω) to provide versatility for different speaker configurations.