I would like to know the approx. value of my equip

Bluebook may be high or low. You really have to look at the data, assuming there is some detail, and be honest with yourself about what you are selling, instead of thinking that you will get the highest price posted for a sale.

Yes some times bluebook isn't the whole story but, it gives you a starting place.

Using the bluebook and learning the market for your specific products is your best bet. This idea of taking the bluebook price and deducting 25% is bad advice.

It is a tough economy for used audio values.... trust me, I just practically gave away some great gear that wasn't all that old. Unfortunately the bottom feeders on fleabay have pushed prices to an all time low. I try to think about the enjoyment some really high quality gear can provide rather than worry about the resale, if I buy it right in the first place and sell it fairly then I got my money's worth. I am trying to sell a great pair of speakers for 40% of what they cost and no bites... I am almost inclined to keep them rather than give them away. I'm also trying to sell an amp that was $3700 new, I can't give it away at $600. It's not like it was a few years ago when people had play money. my Rega P3 sold right away , go figure....