The ZNXH2L is the highest-quality (8V RCA outputs), smartest (it generates a Remote OUT to switch on the rest of the system), simplest (it doesn't need any +12V power supply), smallest and most complete speaker-to-RCA adaptor on the market for connecting an amp or an powered enclosure to your factory head-unit. It switches on and off automatically, provides a Remote OUT for switching on & off the other devices in your installation, and is calibrated so that the factory head-unit won't detect it. And best of all... with 8V RCA outputs, its sound quality is astounding, without the need for a +12V power supply. Truly an incredible product. Add an amplifier or a powered enclosure to any OEM or after market headunit with ease. High-level (speaker cables) to Low-level (RCA) adaptor to turn speaker cables into RCA outputs for amplifiers and powered enclosures. Provides a fully automatic Remote OUT to turn on/off amps and powered enclosures. Breathtaking sound quality, because there is no loss in the transformers like other adaptors. No need to power the adaptor with a +12V, making installation simple and its use magical. Mini size, so you can install it anywhere...