Boxes for CORNWALL IV for local move

Bubble wrap you can get on rolls in various sizes, large bubbles or small bubbles. Go around several times and anchor with packing tape.

You can buy good, soft moving blankets from U-Haul.  I use them to wrap my speakers and other vintage furniture.  Moving tape sticks quite well to them so you can wrap them neatly and tape them up.  

For moving our old Bozaks, which are large speakers like your Cornwalls, I put a sheet of double-walled cardboard that I cut to fit over the face (grilles) of each speaker to prevent any damage to them.  Then wrap the blankets around the speakers with proper folds, etc. like wrapping a gift, and tape it well.

Be careful to not tape directly to the speaker with either packing or painters tape.  I have seen where that stuff can take the finish off and leave lighter areas where the tape was contacting the wood.

When you move them, I'd suggest moving them yourself in your own vehicle like any other fragile/ valuable/ sensitive items you wouldn't want the movers to touch.

Even if tape comes off, it leaves a residue, and then dust and .... gets attached to the residue. After a while you will see where the tape was.

Maybe wrap with cellophane before wrapping with movers blankets?

Here is a budget option...not too expensive...pretty protective...just add rope...

1.5" foam mattress pad....$40 per queen size pad from amazon