Y-splitter for subs subject is getting tiresome

[HAMP]

This whole Y-splitter/Y-Adapter subject is getting tiresome. Why do I say this?
Well I have read that using a Y-splitter will yield about 3db higher(or is it 6db).

Some say just turn the gain a little higher and that will do the same thing. I believe a good setting for the gain is halfway to about ¾ turned up (I have mine set below halfway).

As I said I have set my volume below halfway on the sub and the receiver gain is about
-8db with the bass setting being flat 0. Yes I do have the receiver @ 80Hz with the sub @ 120Hz.

With those settings I love the smoothness of the bass and how hard it hits at the right time.

When I added the Y-Splitter, I noticed something more then just higher gain from the sub. The bass is stronger and it actually last longer. I know it’s more then just gain, because I have turned it down and that’s why it is below halfway now. Like I said the bass is stronger and last longer from being stronger.

Like I started this thread with it’s getting tiresome. There is a reason for the subs to have a left and a right on them and this reason could not be because the receiver has a left and right and should match, that is not the case.

I believe older subs only had one input, but now subs have two inputs. Receivers had and still only one pre-out for the sub, this does not match. All that is just odd!

The question is: Why is it like that? One output, two inputs.

There is a difference with using both. I also wonder why sub manufactures print the manuals as if it doesn’t make a difference if you use one or two inputs.