FedEx shipping damage

Unfortunately, the double insurance won't do you any good because they will only pay for the actual loss, and you will have to produce a receipt to file the claim.

I have a lot of experience with UPS, not very much with FedEx.

UPS can be hit and miss. The horror stories, had a damaged boxed returned with tire tracks on it (was run over by one of their trucks). They asked how I could prove it was their truck? Did not pay claim.

Had a shipment of multiple boxes they picked up. Driver forgot to pick one box up[. They produced a delivery receipt. That is magical since I still had the box in my possession. as trying to prove a point their system was not full proof. They denied the claim and were not amused when I exposed what happened and they NEVER admitted they were wrong.

Whatever you do, don't loose you cool because that will result in a brick wall being built and you will have no chance of collecting. 

It is true that once boxes go through the shipping process (being shipped from point "A" top point "B", the box can loose a lot of strength. When boxes are dropped on their corners, the strength of the box is compromised and weakened. 

Good luck.

I’ve shipped over a hundred jazz archtop guitars and a ton of audio gear with FedEx. Not one damage report . How were they packaged?

If you shipped those speakers back to the vendor you bought them from in just the original packaging without the overpack they shipped them in they probably wouldn't except them. If for some reason you threw overpack away, Fed Ex usually can provide an overpack of some sort if they have it on hand at additional cost which in addition to insurance ensures your shipment gets to it's destination in one piece.

I make this standard practice when I ship to vendors say when they give me credit to trade up to a better-quality component. It's your responsibility and part of the deal!

I just went to FedEx online. Good news, expected news and bad news.
Good news: According to their website a check is On the way. 

Expected news: the check amount is for the sell, not insured price. 
Bad news: the check covers half of the shipping, which they just billed Friday. 

Question: should I dispute claim with FedEx, dispute the shipping charge with CC (Citi), both, or just be happy I received a payment, for all but $250. Thanks 

If you read all of the fine print of the shipping companies, you can see where it is possible that when they are not the ones doing the packing in their boxes with their materials, they can deny everything...or only offer a partial settlement. 

For example, how can you prove that your "X" year old boxes were still of sufficient strength to protect the speakers properly?

The fact that they paid full value for the speakers is a surprise...no matter how good your documentation was....of course you can dispute the shipping but do you really want to be that person with a hidden "check mark" against your name that pops up the next time you have a problem?