Jumping Power Cables

That sounds like a ghetto install if I've ever heard one.  Making the RCA cables longer by splicing in some speaker wire??  Running signal wires alongside power wires?  Eww, shoot them.  But "jumping" a power wire from one amp to the next would be, well, okay except for the fact that the amp input accepts only a certain gauge wire and it's usually a tight fit...you would have to have the room to accept two wires to jump one out.  And a fuse is necessary on the second wire out, as well. 

Anything like what is described above that deviates from accepted install practices is "a bad thing".  I vote "unacceptable" in all cases.

...and let me guess:  the remote wires are probably jumped from the power wires as well, right?  ;)

don't use shhhy rca's!!!  when the  ''HACK SHOP'' did this i got alt wine and humming sound  now the set up that i redone each amp have's it's own power wire and ground new rca wire's '' monster cable '' now it sounds great thanks from the help of this site

p.s you get what you pay 4 do the job right the first time you will be happy that you did !!!!!!!!!                            

                            harmlessv8

Yes, this actually can harm the first amp.  This is not because of a voltage feedback, or something like that, but because of the inability to fuse it seperately from the second amp.

The downside to jumpering is also the upside to using a fused distrobution block.  You can fuse the main power wire appropriately to protect the wire, then where it splits off, you can fuse each amp seperately (important on some amps without their own fuse) to protect the amps themselves.  If you were to simply jumper them, you could fuse the second amp inline, but since the main power wire would feed directly into the first amp, it would need to carry the current for both amps, so you'd have to fuse accordingly.  If the first amp didn't have it's own built in fuse, you could easily damage this amp by driving it beyond it's intended limits.