Need Help identifying late husbands Stereo components Infinity Beta speakers

In search of help, my husband passed away last November. His Stereo is here, and disconnected. Our daughters do not want, and I am not an Audiophile. I have pictures of the system. The Infinity Beta speakers are the old huge ones, and I have the original boxes, threshold preamp, and other parts. There is a plethora of remotes. Not sure where to start with identification and where the best site to sell is. Any help is appreciated. Thank you.