Much depends on the value of the system. A $20k system might be handled much differently than a $200k system. I've told my daughters, who sadly will have no interest in my gear, to contact my dealer and TMR. I wouldn't want them trying to sell on their own. They wouldn't know how and when that time comes getting things settled in an expeditious manner is important. Often more important than holding out for the last dime.
Consigning with a dealer might reduce the commission but most dealers don't have the marketing reach of TMR. Even more importantly, once TMR lists and sells your item, you get your money inside of a week and you are totally insulated from the buyer. I wouldn't want my girls to be tied up dealing with some disgruntled buyer (or scammer) because that can go on for months.
Turn it into cash with the least effort and move on.

