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while the optional F2O card adds a second optical input and a coaxial S/PDIF input
This makes it a practical choice for listeners replacing basic full-range speakers with a more focused component layout
controlled power to an upgraded vehicle audio system
This amplifier fits well in a multi-speaker upgrade
Rockford Fosgate RFK4 4 AWG Power Installation Kit Shallow Mount Subwoofers while the optional F2O cardThe Rockford Fosgate RFK4 is a 4 AWG power installation kit for adding an aftermarket car audio amplifier. It provides the primary power, ground, remote turn on, fuse protection, and termination hardware needed to establish an amplifier power connection. This power only kit is intended for installers building a system with separately selected signal and speaker wiring. Designed for vehicle audio upgrades that call for 4 AWG connections, the RFK4 helps
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