For many years, as a machinist and field tech with the Westinghouse Corp. I spent a great deal of time analyzing and solving problems related to resonance and vibration. Wither to couple or to isolate, you are looking at two very different solutions to address a common problem. While it does make moving a heavy speaker a bit more difficult, using a good, well secured set of spikes can be very effective, as long as the floor itself is good and solid. Spikes help to solve three problems. They eliminate looseness and vibration between the speaker and floor; they couple the relative small mass of the speaker to the much greater mass of the floor and structure of the home which helps to reduce the chance resonance and they prevent your speakers from walking. Spikes is, by far, the cheapest and easiest way to solve most problems and get better sound from your speakers but if your floors are not solid or you live in an area of heavy traffic and are getting outside vibrations through your floors then isolation (usually much more expensive and difficult to achieve) is your best option. There are some very expensive products out there that may or may not work. Not only do you want to reduce or eliminate vibrations from outside sources, you do not want to cause instability and movement of the speaker itself. Try first, before spending a lot of money, a small, thin, sand bag or firm gel pack under each corner of the speaker. Sometimes the simplest and cheapest solution is the best.
Regards,
Jim
Regards,
Jim