This high quality, gold plated adapter enables the signals from 2 RCA-terminated cables to merge into a single RCA cable. The most common application for this adapter is with a subwoofer that has 2 RCA inputs and only a single interconnect will be used. A short RCA terminated cable from one of the female RCA connections on the adapter to the second RCA input on the subwoofer results in better subwoofer performance.