Changing from NL4 to EP5 on some D&B C7 boxes, quite time consuming. This C7 system is designed very well with the EP5 system, solid connectors, easily extended as work as male and female. The D12 amps take advantage of the 5th pin to use sense drive. Would be nice to get some 2.5mm 5core cable to go with however was hard to find so went with 6 core ignoring the 6th. Takes a while to get used to soldering these guys but are solid when in correctly. You can just above persuade a EP5 into an NL8 panel, these are however tricky to cut panel for as they have a section behind clip which sticks out, would be nice to see some pre punched panels on here