How do you move HEAVY speakers with sharp spikes without lifting?

I tried the sliders but didn't work for me. I used 4 inch round plastic sliders and cut a 1x2x1/8 inch strip of heavy steel to provide support and placed steel between slider and spike. Sliders bent too much under the weight due to carpet pad being too thick causing the speaker to be unstable.  I think would have worked with lighter speakers or thinner carpet. I also can't lay speakers on their side due to their shape.

Book insert/shimmy to add/remove spikes is a good idea - will try that but installing/uninstalling my spikes is a pain.

What kind of worked was my original method but it's still not ideal. I cut a piece of 3/4 inch thick plywood to cover just over half the area under the base (i.e. to support 2 of the 4 spikes) and have wood extend a few inches out beyond the bottom of speaker. Cut a second piece to cover the other half of base. Tilt speakers about 25 degrees onto 2 of the 4 spikes and have a second person slide one of the wood pieces under the 2 spikes which are in the air. Lower the speaker onto the wood and tilt the other direction, slide the second piece of wood under the other 2 spikes. Now two pieces of wood under the speaker with 2 spikes per piece of wood. Can now slide entire speaker on spikes a few inches with some effort. 

A couple inches makes a huge difference with my omni speakers. Thanks for the help.

Hire 2 really big guys. 

But not from UPS. 😛

I first disagreed with the response of cd318 because I have always heard improvements using spikes or Tiptoes under floorstanders, especially on carpet. Then I remembered the OPs post stating they were 175 lbs each. With that much weight, they probably are completely stable without spikes, even on carpet. 

hopefully there's some construction being done nearby. around 5pm, when their shift ends, approach the two biggest dudes, and offer them $20 each to do some light lifting. I've done this countless times, works like a charm!