How is the Speakon connector wired for REL sub?


Recently purchased a used REL T2 sub that came without the Speakon cable. I just got the Speakon connector from Parts Express but am not sure where each wire is attached on the connector. Anybody familiar with the wiring configuration on these cables? Which pin gets left, right and ground? Thanks.
timrhu
@waterzlife I found the Neutrik NL4FX 4-Pole speakON Cable Connector to be superior to the Neutrik NL4FC 4-Pole speakON Cable Connector.
Although both will work the NL4FX has a more robust easier to use thumb mechanism. I have used both purchased on Amazon.
On Neutrik SpeakON:
Black 1-
Red   1+
Yellow 2+
Hi all,
I have a REL 328 with a Neutrik Speakon plug.
I'm connecting it to an Adcom A/B 535L 60w amp.
The amp has two R/L speaker terminals — "A" and "B"
Usually, I connect my main speakers to the "A" terminals.
I connect my REL to the "B" terminals.
I've watched the videos and have connected the REL Speakon plug (high-level input) to the REL and at the amplifier the Red wire to R+, the Yellow wire to L+, and the Black wire to L-

A couple questions.

1. HUM. I hear a bit of a hum from the REL when nothing is playing. A ground problem, no? Is there a way to connect it differently that will help with that?

2. TWO SETS OF MAINS + REL. If I wanted to connect two sets of main speakers simultaneously, would I just twist the REL wires in with the main speakers' wires at the terminal, still connecting as described above?

3. DANGER? Is (2) an inadvisable thing to do?

I see there's a lot of expertise here, and hope I've been clear. Thank you.
As I mentioned above your questions are answered here: https://rel.net/how-to-connect-my-rel/ find the session that talks about eliminating the hum.

2) Yes
3) No problem.
Try this to eliminate the hum, this should be in the video's I mentioned above, but maybe not.
Using the Neutrik Speakon plug connection as you stated that you are doing, now run a single RCA interconnect from the sub red line input to a red RCA input on your preamp. This should eliminate the hum.