External cavity feedback spectral beam combining (SBC) of two fiber lasers is investigated experimentally. A transmission grating is employed as the beam combining element and the SBC of a 1060 nm laser and a 1080 nm laser is achieved. The beam quality of 1.328 in SBC direction is obtained, while the beam quality in the other direction is 1.257. The output power of the SBC system is 57.3 W with a combining efficiency of 91.7%. Based on the configuration in this experiment, the requirement on the bandwidth of a single laser participating in the SBC can be significantly relieved. The experiment results verify the feasibility of multi-channel SBC. The SBC output power can be improved by the increase of the channels of the SBC system.