I don't know why you don't have the spikes, but I would contact Von Schweikert.
As to the "3 positive and 3 negative connectors". These speakers have the option for tri-amplification (a separate amplifier for high frequency, mid frequency and low frequency drivers). To tri-amp them you remove the jumper straps and the data link cable. If you wish to drive the speakers with a single set of cables, you will need the jumpers for the lower cabinet installed and the data link cable in place.