You will not likely sell them to anyone outside the US.
Get a quote from ABF of cost from LA to NY.
That can be your baseline figure.
Never use PSPS or UPS. They roll boxes.
Fed Ex ground has been good for me for under 100 lbs.
Packing & Shipping Large/Heavy Speakers
I have a pair of Legacy Whisper XDS's I'm wanting to sell. They measure 63x17x13 and probably weigh about 200lbs (or more), so extremely large. Most of the advice I've read is simply to crate them on a pallet and then ship freight; but how to go about that? I know for freight shipping there are websites to get quotes, but it's really the packing aspect I'm concerned about having never tried to pack anything this large.