Wavtech LINK4

4-Channel LOC wSumming and Remote When it comes to adding an amplifier or amplifiers to your factory audio system, the link4 does what models from competing brands just cant. Simply put, it is the most flexible 4-channel LOC available today. The link4 can directly accept 4-channels of input and give you 4-channels of output. It can accept 2-channels of input and give you 4-channels of output. If you input 4-channels, you can sum them down to 2-channels of output and pass through another 2-cha...