why is there a slight echoing affect in background of apple hi res songs.

Hello Gregory Lamica,

Thank you for reaching out to Apple Support Communities.

If you are referring to Dolby Atmos these steps may help:

"Choose how to listen to Dolby Atmos on your Mac

1. Update your Mac to the latest version of macOS.
2. Open the Apple Music app.
3. In the menu bar, choose Music > Preferences or Music > Settings.
4. Click the Playback tab. 
5. Choose Automatic, Always On, or Off.

If you choose Automatic, here’s what you need

Supported songs automatically play in Dolby Atmos when you're listening with:

• AirPods Pro, AirPods Max, AirPods (3rd generation), or Beats Fit Pro with Spatial Audio turned on
• AirPods (1st or 2nd generation)
• BeatsX, Beats Solo3 Wireless, Beats Studio3, Powerbeats3 Wireless, Beats Flex, Powerbeats Pro, Beats Solo Pro, or Beats Studio Buds
• The built-in speakers on a MacBook Pro (2018 model or later), MacBook Air (2018 model or later), or iMac (2021 model)

If you choose Always On, here’s what you need

If you want to use other headphones that don’t support automatic playback, choose Always On."

More details can be found here: About Spatial Audio with Dolby Atmos in Apple Music

If this isn't the case, can you provide more details? Which app are you currently using? Does this happen with multiple songs or one specific song? Also, when did you first notice this?

Cheers!