I have a 10" Polk sub, the same as everyone else, and a DP Pro coming in very soon.

When I hooked the sub up to my old Spiderman, I used basic male/female wire connectors spliced a few inches back from the cab speaker terminal. This way I could simply disconnect the sub and reconnect the original speaker when I had to move or sell.

Two questions...

1 - With the sub clipped or soldered to the original cab speaker... is there enough power to properly power the cab speaker? Wouldn't adding the sub in addition stress the amp?
2 - What the benefit of using the Pinsub system? The ability to adjust the volume for the machine AND the sub at the same time? - I can't remember, but I thought the sub volume changed whenever I adjusted the machines volume from the coin door... I could be wrong though.