David informed me that he was just using the threaded point without the jam nut and the rest of the cone assembly. The lack of bass is understandable when you consider that the increased sheering potential virtually destroyed the dynamic coupling of the speaker to the floor. A properly designed speaker foot is rigid to pass built up energy from the speaker cabinet into the earth. With the point just screwed into the fastener on the bottom of the speaker, the energy could not pass through the spike as a drain. The build up of energy within the cabinet heightened the cabinet resonance and cancelled some of the bass energy. Just using the point with a jam nut is not enough because the resonant frequency of this combination is very high and you will hear this in the speaker's reproduction. The entire cone assembly must be used to damp the foot. This results in a single digit resonant frequency which is too low to hear. The result is a much fuller and relaxed presentation which David noted. Using the battery ops in the BAM will also provide the listener with a more relaxed and full presentation than the AC mode. This speaker's degree of resolution will show up seemingly insignificant issues and make them extremely audible. So, some of the procedures taken for granted with other speakers need to be paid attention to here. The more you do this, the better the end result.
One last thing, Tubegroover mentioned a sixth toe mod. This was done to David's speakers but for those of you that have not done it, the difference in bass quantity and impact is remarkable.
Bobby@merlin
