Need Help identifying late husbands Stereo components Infinity Beta speakers

Thank you all for your help, here is list of components.
beta speakers, I have the original boxes. Stored in heated insulated barn.
threshhold DAC 1/e digital processor
infinity IRS Servo  
BK M-200
ADCOM 5800
ADCOM 5802
Threshold T-2 preamp
Threshold DC power source e
threshold serial number 09411 this looks like the DC power source, but is bigger and heavier. 

Then there is is a plethora of remotes, I have a forte remote but I am not sure which component it belongs to. There are other components in the storage room too. 

I am weary of craigslist, as in my area it is mostly low end items.
we are in Michigan north of Detroit. 
I truly appreciate your  help. This is very hard to do. He only taught me how to use the home theater, I have no idea how to even turn on this system. As we only have one child still at home I am looking to downsize. 
Thank you all.

Dear HIfiman5, please do write down a detailed list and directions. My husband taught me how to turn on the home theater, but not where to plug in an iPod on the surround unit.  He was a computer engineer, and worked his magic to create sound for us to enjoy.  he died unexpectedly from an aortic aneurysm. He had a stressful day at work. He called me and asked me to turn on the preamp. Came home and went to decompress listening to Claus Schulze Dresden performance part 4. His suit coat is still on the chair in front of his Stereo. He died in his chair, listening to a favorite piece of music. While I appreciate the fact he passed without pain in his Audiophile space, I can not bear to enter the lower level, seeing the speakers along the wall. His sound panels designed to eliminate the echo. This is another reason why we have decided to sell. 
Thank you all for your help. It is truly appreciated.

I appreciate everyone’s help with the stereo equipment.
This has been a difficult year. Have rehomed the not in use items from the storage room. As for the Infinity Betas they are still here, set up, completely connected to all the components as he left them. I did have dealers come out to the house, they all wanted to disconnect the system and piecemeal the components. As the Speakers are large none of the dealers wanted to take them to their storefronts.   while I am not equipment savvy, it would seem to me that listening to the speakers before buying them would be mandatory, and to do that the components are necessary. So it is all here set up, unplugged from the wall.
The holidays were very difficult for my daughters and I. As spring is upon us, it is time to make changes.
I have the original boxes for the Betas, and most of the components in our heated pole barn.
We are ready to sell the system. Obviously the speakers must be sold first, either with or without the components. As to price, multiple dealers came out to the house and listened to them. I now know how to turn on the system. Have been told “ they image beautifully”, all 3 dealers quoted $12-15K as expected sale price for the speakers alone.
It is time they were with someone who can truly enjoy them. I am not all that comfortable with having strangers to my home without the presence of my Local Sheriff.
If anyone is truly interested in buying, I am ready to sell.

Again Thank you all for your expertise and knowledge.