Yes, you can use ARC (Audio Return Channel) instead of eARC (Enhanced Audio Return Channel) on your TV and audio system. However, there are a few key differences between the two that you should be aware of. ARC is an older technology, and its main purpose is to transmit audio from the TV back to the audio system. It is limited to a maximum bandwidth of about 340Mbps, which is enough for most basic audio formats like Dolby Digital, but not enough for more advanced formats like Dolby Atmos. On the other hand, eARC is an updated version of ARC, which supports higher bandwidth and more advanced audio formats like Dolby Atmos and DTS: X. It also allows for more control over audio settings and can transmit multiple audio channels in one stream. So, if you're using an older audio system that doesn't support advanced audio formats, then you can use ARC. But if you have a newer audio system that supports advanced audio formats and you want to get the best audio quality, then you should use eARC.