"No loss signal path by virtue of copper-to-copper connections.Speaker terminals are not made from pure copper, most are actually steel or brass. These metals are far less conductive than copper. The effect of any connection that is lower in conductivity than the cable is that of a resistor. New class D amps favor lower impedance loads, at 1 Ohm, the terminal can account for as much as 10% of the total load. This amounts to dead weight in an audio system.
A mechanical copper-to-copper connection keeps signal loss to a minimum it is virtually impossible to measure the losses. This is better than a soldered connection. Even the best lead-free, silver alloy solders are less than 20% conductive when compared to pure copper."