Hypothetical question.

Are they inheriting your room as well?  And would they enjoy the system as you did having not undergone the discovery process of assembling it?

  A novice imo should have their own discovery process, not buy the end result ready made.

   Your heirs should be allowed to get as much money as they can for each component to compensate them for the work involved in disposing of your stuff 

It isn’t a fine tuned instrument once it’s out of your room. Also, it’s much easier and quicker to sell individual components. Go on hifishark and look at historical prices for your electronics and speakers. 
The record collection is going to be the most difficult to move. 

I have a document I prepared in case I eat it, for my wife with all sorts of information in it.  About once a year, I audit my gear's approximate market value for each piece and update it.  That can give her some good information on what she has and what it's worth.  From there she can decide if she wants to sell it as a whole or part it out.  

Knowing her, she'll probably sell it as a whole for less $$ and move on since she'll have much bigger issues to deal with than this stuff.  

It's going with me. One big ass hole in the middle of my property. Nobody else wants the hassle.

An estate sales bottom feeder will pick it up for pennies on the dollar, list it on Craigslist or Marketplace, ask near full retail having only researched original pricing. They won’t be able to answer one question for prospective buyers other than, no, it doesn’t have a remote, the original boxes, or owners manual. NO LOW BALLERS!