The PAC SNI-35 is a high-quality 2-channel adjustable line output converter (LOC) designed to convert speaker-level outputs to RCA-level preamp signals. Ideal for adding aftermarket amplifiers to factory or OEM car stereos. Features precision adjustment dials for fine-tuning output voltage and noise isolation. Features: • Converts speaker-level outputs to RCA preamp-level signals • 2-channel adjustable output • Built-in ground loop isolation • Compact and durable design • Works with most factory and aftermarket head units