1 What does Nickel or Black mean? - This refers to the color of the connector shell.

2 Type of Module Plate? - Solder Point module plates will have Speakon on the front and male spade connectors on the rear. Solderless module plates will have Speakon on the front and screw terminals on the rear.

3 What does D Series or G Series mean? - This simply refers to the connector mounting holes used in the plate. The D Series type is a 3 hole design and connectors mount to the plate with machine screws. The G Series type is a 5 hole design and connectors mount to the plate with machine screws.