How to calculate freight class for speaker shippin


Hello
I'm thinking of selling some speakers and I'm trying to determine how to determine the freight class. I found some online calculators that give me a freight class of around 75.

Here are the calculations:
Two Vienna Acoustic Beethoven cartons side by side on a pallet.
48 x 30 x 14 (with pallet thickness)
I estimate a weight of 135 plus 40 for the pallet = 175 lb
The online calculators all say about 70 to 80 freight class.

But I'm still confused about the freight class. Does the estimated value of the freight increase the weight factor? If I insure it at $2000.00 does that increase the weight class beyond 70?
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Try the eBay uShip service, and make the buyer do a pick up via his using that service. The insurance issue still exists. I was recently quoted blanket service for two speakers weighting about a total of 100 pounds for a 850 mile trip for $225, including the uShip fee.
Freight class 150. I still have the bill of lading from FreightCenter. Shipped Gershman Acoustic Sonograms a few months back.
My speakers were 48 x 40 x 30 and weighed 215 lbs. They use cubic space to figure things. The cost was figured using the size of a standard pallet. When they came to pick them up, the truck wouldn't fit down my road, too many low branches, so I had to put the boxes in my Nissan and drive them about a quarter mile to the corner and slide them onto the truck.
As far as insuring them, I got info from FreightCenter for an insurer as I set things up. I used Inland insurance, and it wasn't very expensive to insure for 2 grand. The shipper was R&L Carriers, who took them to one of their facilities where the buyer wanted to pick them up. Check out FreightCenter. You can find everything you need. Can even fill out the forms to see if you're satisfied before you commit. I was pleased with them.
Sorry for all of the separate posts, but this comes to me after I think back...
When I got things rolling with FreightCenter, they contacted me to make sure things were right. Once you're happy with how things look, then you can commit. They called multiple times, sent emails to let me know how things were progressing. They are right on top of things and very thorough.