Sellers: When do you drop your price?

You should  to state what type off equipment , how well known 
and the condition  , most all equipment doesnot even get $50% 
used . cables the biggest drop in price ,if it’s a well known hot product , like Wilson Audio , Pass labs, McIntosh and a. Few others keep their value very well ,the majority after 2 years 50% 
if you are lucky ,you should get the original box if possible 
people want all original packing materials.

Go to Audiogon blue book to see the average,or look on line at others for sale , 1/3 off is most likely not going to happen ,but gives you a 20% margin to bargain with.

" You said this was your first sale on Audiogon.  I didn’t check but I assume you don’t have any feedback ratings."

The OP did not say it was his first sale on AG, he said it was his first sale. He does have AG feedback and the ad is on AudioMart.

I tried to sell a pair of speakers here a month ago. They were brand new, they didn’t work well with my amp but they were high end and decent speakers. Regardless what I listed it for, all the offers came in at around 55% of the original price. First I felt insulted. I didn’t understand why everyone’s offer was so low. Later I found out they wanted to flip it for a profit. Given that it was brand new, box, warranty and all, I still think it was disgraceful. I later figured that eventually someone will pay slightly more, someone who won’t flip it. It’s a matter of time. I would check how many of the same items are up for sale and if you want to sell, price it at the lowest or slightly lower than - and offer something extra

Just for your information so that you know all used  equipment is 50% off that's a given.