The various microphone-carrying cameras should also record the 2020 rover's heat shield dropping away and the operations of the sky crane, Wallace added.
"These are all going to be hugely beneficial to understand the sky crane better," Wallace said.
A number of future Mars landing architectures make use of the sky crane system, which has significant growth potential, he said.
Big wheels turning
The microphones will keep rolling after touchdown, too, capturing a variety of sounds.
"We'll hear wheels turning, the drill drilling, probably hear the rover's mast moving," Wallace said. "Wind interactions, at least fairly high-speed winds - I would think we'd hear those too."
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The team also recently decided to add a microphone to the rover's laser-firing SuperCam.
Mounted on the "head" of the rover's long-necked mast, SuperCam can provide imaging, chemical-composition analysis and mineralogy data. The instrument will also be able to detect the presence of organic compounds in rocks and Mars dirt (or regolith) from a distance.
"So when they actually fire the laser and collect spectral data, they'll also be able to collect sound data at the same time," Wallace said.
The microphones are primarily a public-outreach tool, Wallace said. But sound can also be an important engineering diagnostic, sometimes providing a first indication that a pump or other hardware isn't quite up to snuff, he added.
"You can hear very well things that originate within 10 to 20 feet [3 to 6 meters] of the microphone," Wallace said. "We're going to hear a lot of great stuff."
Leonard David is author of "Mars: Our Future on the Red Planet," to be published by National Geographic this October. The book is a companion to the National Geographic Channel six-part series coming in November. A longtime writer for Space.com, David has been reporting on the space industry for more than five decades. Originally published on Space.com.
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