I sent a pair of Linn Ninka's with these, original box's help too .I've never had issues with UPS or Parcelforce via Interparcel.com or ParcelmonkeyI'd recommend them or as above, see if you can sort a 'wam taxi'
You can use one of the parcel carriers but they all cock up at some point, people saying they have never had a problem with a parcel carrier is a bit like people saying they don't bother backing up data because they have never had a hard drive failure.They forget to add the word 'yet'.
If you want to use a proper end to end courier where your speakers won't get dropped off the back of a tail lift then try these guys.
It will be more expensive than a parcel carrier but you get the service you pay for.
Good advice. I've had a pair of AudioNotes trashed by a courier, although the box appeared undamaged. Both voice coils damaged.I work in the distribution industry.I would not ship floor standing speakers through any parcel carrier - pick your packed speaker up and drop it from waist height - this is what is going to happen during sorting at parcel hubs. Millions of parcels are being sorted on a nightly basis and do not imagine that your precious speakers are being handled with kid gloves.
A dedicated end to end courier or a pallet service are the way to go to ensure safe transit, then again if you want to save money use a parcel carrier and pray.