Technically the 60 Hz setting is the correct one to use as per the recommendation of the receiver manufacturer. However this does not take into consideration your particular room acoustics and for that reason I would at least give the 80 Hz a try and see what you think. The key with either the spikes or the rubber feet is to keep the front baffle of the sub woofer off the floor and avoid a coupling effect that is not desirable. The spikes are mainly used for carpeted surfaces as they will penetrate to the sub floor underneath and add stability. There is also the argument that the spikes, due to their small surface area will isolate the sub from the floor better than the feet. From a strictly physics point of view this is correct though the difference may be hard to hear and probably not worth ruining your floor over.
Ian Colquhoun
President & Chief Engineer
