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


I have large (175 pounds each) speakers with sharp spikes placed on carpet. I would like to be able to move them a few feet by myself to tweak their positions but lifting them is obviously not an option (I can't even lift half their weight).

I currently use a convoluted method involving tilting them over about 30 degrees, slide a board under spikes on one side, and then repeat on the other side. The speakers almost toppled over the other day which would damage them.

I'm aware there are non-spike alternatives but do not have the money to spend on these options. Any clever moving methods out there? 

Thanks!
wahoospiff
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. 
Post removed 
Wilson has aluminum sliders that have a spike hole in the top and have silicone on the bottom. I've not used them but understand they work.
I've bought ordinary tiles and glued felt on the bottom. Then I've eased the speakers onto the tiles and slid the speakers.  My speakers are about 100 lb. each. I'm able to adjust toe in and positioning by moving the speakers carefully so they don't slip off the tiles.