Audio Issues with MacBook Air

Make an appointment at the Apple Genius Bar for service after the stores re-open. If you need to find an Apple Store - Find a Store - Apple. Also, see How to find your nearest Apple Authorized Service Provider (AASP) or Distributor (AAD). You may also get Apple authorized service at a local Best Buy.

"Your Apple-branded or Beats-branded hardware product (“Product”) is warranted against defects in materials and workmanship for a period of ONE (1) YEAR from the date of original retail purchase (“Warranty Period”) when used in accordance with Apple`s user manuals (refer to www.apple.com/support/country). Under this warranty, you will be able to direct your claims to Apple even in situations where you purchased the Apple Product from a third party.” [Apple One (1) Year Limited Warranty – Accessory - For Apple and Beats Branded Products Only.]

If you have a distorted sound output from the mic on your headset, then it may be due to having the Input volume set too high. It may also be due to a poor impedance match between the headset mic and the audio input on the computer. Not all headsets have the input and output impedances that closely match those of the computer. Some headsets work well, and others do not. That's been my experience with at least a dozen headsets I've tried.

They aren't. The part of my reply that preceded those applies to the speakers. Get that fixed under your warranty.