The line convertor you posted up previously is designed to convert up to a 50 watt amplified signal down to a line level input. If you are using this product then the factory line amp imputs WILL NOT WORK. Have you confirmed the location and number of amps in your car? Is it a shaker 500 system? do you know which amps are operating with the high pass signal and which is using the low pass signal. My understanding is that the factory line level inputs are not ideal for aftermarket amps. If in fact you can tap the line inputs and route them through RCA's to your eclipse amp, then this may work, however i don't know of anyone who has even tried to do it this way. Please keep us posted and track the wire colors and locations, so if this works, others can try it as well.
2012 GT CS Ingot Silver Vert, Edelbrock E-force supercharger with CAI and 3.5 Pulley, Tremec T-56 Mag, Accufab 84.5, Centerforce DF, Billet Yoke aluminum driveshaft, FRPP 3.73 Rear, MRT Performance H-pipe, Bassani axle backs, JL Audio sound, Edelbrock strut tower brace, JPC adjustable UCA, UMI adjustable panhard bar, KW V3 coilovers, Steeda heavy duty front mounts, Steeda rear LCA's, 20" Steeda Spyders with Michelin Pilot Super Sports, Steeda Big Brake Kit ....... it just keeps going.