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Right, question 2 - I have a 4 channel amp so have 2 pairs of RCA connectors but the headunit only has a single pair. Can I just get one of these and join the front and rear's together?


Depends on the direction you're going. I think, assuming that what you're talking about is a 4-channel amp and a 2-channel head unit, yes that's possible.

But you're not joining in that case, you're splitting. So your word "join" is confusing there. What you'd be doing in that case is splitting the outputs of the head unit to go into the 4 inputs of the amp.

However. does your amp have pass-through connectors on it? If so, use those instead, do not use the Y-splitter adapter you pictured. Only use the Y-adapter as a last resort if your amp doesn't have pass-through connectors. Illustrations of various ways to hook things up are here.

If you're going the other direction, trying to take four output channels and combine them into two input channels, that really is joining, and you should not do it.
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Tony Fabris