I have speakers that have casters, b&w, and they can be retracted to drop some spikes but I never use those. I have wooden floors.
I’m not a big fan of spikes… I doubt you can really discern the difference so I use casters and I have some smaller speakers that I’ve placed on a wood platform with casters that is super convenient since they weigh 80 pounds apiece.
i use casters underneath my mono amplifiers. Sound anchor is what I use for the amplifier racks which were custom-made. They produce some amazing steel racks for a really reasonable price and its done in the USA in Florida. Great people to talk to.
There’s so many other things you can do in a sound system and putting spikes on speakers rather than casters I don’t see us being very high on the priority list. Cost benefit clearly in favor of casters.

