Spikes for very heavy speakers

Just to clarify - my current question and concern is around feasibility of spikes "biting" into concrete.
My last speakers were 95lbs....and I had no problem resting them on spikes but now I am just not sure if 4 tiny points holding 215 lbs against concrete was the best approach.
I wouldn't hesitate if I had wooden floors (knowing they will just dig in as far as they can) but with concrete slab I thought I might not be able to provide proper stability via spikes 

I am guessing maybe I am just over-analyzing it ......

@ether, is your entire floor in the room you will be listening to music in all concrete or is part of it carpeted?

only where the equipment rests is bare floor..... rest is carpeted.....I know....I know... this would be some crazy echo chamber if it was all concrete

Audio Points may be an option here. There are a set that can handle upto 450lbs and you can add the coupling disks or APC-D4 invert to protect the spikes from bending. I should add they also make significant improvement to the sound.   Good luck

I think you also have to take into account 215/4= 53lb is aprox what each spike see's (speakers are not evenly weight distributed) not really too much when you look at it like that. 

If it were me I'd get some ISO acoustic footers for your speakers they do wonders I'm my system and they are not that expensive. Just get the ones for your speaker weight as they will need to support that 53lb each. 

If your really concerned and want to go very cheep go to a local machine shop and get them to turn off some metal discs (brass for example) with a dimple in them for under your spikes. that's the lest expensive way to get floor protection. 

I never understood why people here never think to use here local machinist for many of our simpler metal work.  most seem to want to buy some expensive thing with a fancy name, made in another country then use a local shop to make the same thing or better for 1/4 the cost.