Selling Large Speakers - How to reduce shipping?

Try Bax Global. Put them on a pallet. Borrow a banding machine or just get some plastice banding and a few of the clips. You can do it yourself using a pliers instead of the banding tool. Uhaul sells that stretch plastic, about $6. per large roll and definitely go around each speaker to keep out the rain.

Very important. If one gets damaged could you replace it with an exact match? I would insure for twice the amount of the speakers that way if one goes you are covered.
Also extremely important. The buyer must view the speakers before signing off on them. In other words he must remove the plastic wrap and have a clear view of the boxes to check for damage. Once he signs off on them it could be over.

Next time purchase smaller speakers...

I tried calling Bax Global now called DB Schenker. It seems they don't deal with private customers. I asked them if I could drop off my speakers at one of their locations. Their reply was that I am an unknown shipper and they will only deal with businesses.

Thanks for all the replies. I'm checking into some of your suggestions.

You may want to look into moving companies in your area.

My Infinity RSIIb's (pretty big speakers) were shipped from Florida to NJ (to me) via a moving company that goes up and down I-95 every 10 days or so. In addition to their normal loads they will bring along other items if there is room. Instead of the UPS Freight charge of >$1000, I paid them ~$475, and the speakers arrived in perfect condition.

Pilot Air is the best - $230 for speakers 6 feet tall and 175 pounds each. $116 for 50 inch - 105 pound speakers. That is fully insured. No reason to pay upwards of $500 with others. Check out Pilot Air.

I used them at least 6 times with heavy speakers and each time the cost was $115 - $230. Yes, you must ship and pick up from one of their locations.

Forward Air offers very reasonable terminal-to-terminal air freight shipping. The speakers would have to be strapped to a pallet, but I believe the offer that service. You'd just have to make sure there's nearby terminals where you are shipping to and from. I've had good experience with them in the past, but it's been many years since I've had to ship anything like that.