content: Well... audio networking solutions like CobraNet, Dante, QSys, AVB (now being called TSN), BluLink, a variety of others.  But you're not gaining anything over a properly terminated cable of the appropriate type for the device being used (typically Cat 6 or better, there are some situations that call for 6A).  There are also solutions that carry audio with video, like HDBaseT or a variety of extenders. So they do, but... you're better off spending that cash learning how to terminate a cable correctly.  And to use a freaking boot.  Why does no one use a boot??