Need a little help

Let me try to recap (!), saying some things that so far have perhaps been taken too much for granted:

1. The NAD is a much better piece of equipment than the Pioneer. Unless you need/want the tuner section of the Pioneer as a source or as a part of your AV system, there is no point in keeping it in the system, especially not as a preamp.

2. You need three sets of line-level ("pre-out") outputs to feed your twin amps and sub. A 1 --> 3 way splitter will do that without major issues.

3. Cable the splitter into your single pre-out from the NAD, connect one splitter output to one of the Anthems, another to the other Anthem and the third to the subwoofer and you are done.

4. Sell/donate/store/burn the Pioneer, unless you need a radio.

@spoonman16510 Still confused 

Share more.  What part of the replies are you still confused about?

Several replies above trying to restate the same thing for you, so it's best to come straight out and share what does not yet make sense or creating confusion. What is about the "splitter" that is still not making sense or requires additional explanation in a different way perhaps.  If you share more, plenty of members here to help.  

                       ------sub

NAD----splitter

                      ------ amps

Thanks for all the advice everyone.  This splitter that I need; can I find one on Amazon? 

SOIX, that looks more for car audio?