Yes and no.
Basically all current day Processors & AV Receivers can decode AC3 as that is the technical name for Dolby Digital since the beginning. Thus, hook up any DVD player, Blu ray player, cable box, digital TV, game system, streaming box, etc. with an optical / coaxial digital output and you’ll get AC3 (as well as DTS) discrete 5.1 sound.
However, the version of AC3 for LaserDisc is called
AC3-RF. This Marantz does not have that type of input so you would need an AC3-RF Demodulator to make it work w/ this AV Receiver.
Here is a link to all the AV products that support AC3-RF.
https://www.lddb.com/hardware/part/ac3rf/Hope this helps.