Where/what is the best place to sell used components

Lots of people are moving things on Facebook Marketplace, on a group called Audiophile Swap and Shop.it’s a private group with almost 57K members. People selling lower end to higher end. I have had good luck and know others that have as well.

Unless you sell everything face to face, I’m not sure the hassles of shipping, etc are worth it. Personally, I would donate them and write off the donation. It will be worth more overall.

Similar to what has been suggested - do you perhaps have nephews or nieces who may appreciate a special gift?   It could be life changing, so you will have to think very carefully....

Selling low-dollar stuff is a pain.  Good packing materials and shipping are very expensive, not to mention the commissions on the auction sites. Then, people get it and they have buyers' remorse and want to return it, as if they bought from a store. It's not worth it, IMO.  I remember selling my father's old ESL tonearm that I described as a "rusty piece of junk" in my ad, but I was selling because it was rare and someone might want it to restore.  Don't think the buyer didn't complain because the plastic base was cracked or whatever.  Nowdays, I pretty much sell in person or keep it. 

Reading between the lines, it seems that you are still interested in audio (“my B&W’s”). So, if that is the case and since you are brand new to this site, the answer to your question is HERE, of course. What I would do is go to eBay and look at recent sales of the same items you want to sell. Since you are willing to consider the possibility that they may be “worthless”, which they are not, lower those eBay sold prices by, say, 25% or more and list them here accordingly. This way you can build positive feedback for yourself which will make future purchases and sales much easier. Even diehard Agon audiophiles are sometimes interested in buying inexpensive pieces for second or third systems, or as gifts; and most realize that everyone starts out with zero feedback. It’s up to you how you present yourself and the items in your ads here. Maybe even explain in the ad that one of your goals is to build positive feedback. If I were looking for inexpensive gear for my son, as I was a couple of years ago, I would have taken a chance on you 😊. Good luck.