"Phoenix" is a brand name. The connector is usually referred to as a Euroblock connector. Other manufactures make similar connecters (Wago, Molex, Hosa).

This site should help:

[Link: prosoundtraining.com]

If you find a connector which mates properly, it may have markings at each terminal that don't correspond with what you're plugging into. For example they might be 1-2-3-4 on the chassis connector but 4-3-2-1 on the plug. Or one may have Tx-Rx-V-G printed on it and the mating connector may have R+ R- L- L+.

Just don't get me started on 2-conductor round power connectors found on the ends of plug-in power supplies. No thought is given to the polarity, the voltage, the amperage, or whether it's AC or DC.