When sourcing a Car Audio DSP, you must prioritize the number of input and output channels (e.g., 6-in/8-out or 8-in/12-out) to ensure compatibility with the vehicle's speaker configuration. Look for a high Sampling Rate (at least 96kHz/24-bit) for high-resolution audio processing. Additionally, verify the Signal-to-Noise Ratio (SNR); professional-grade units should exceed 100dB to ensure minimal background hiss. Check for integrated High-Level inputs with auto-turn-on functions, which are essential for integrating with modern OEM factory head units.