Crossover design why resistor has jumper on both sides

[Galu]

P.S. Go and try this. Return to this thread when you can tell us the result.

 

[Scottmoose]

So what do you suggest to leave it as is or remove the jumper?

I don't suggest anything, other than answering what it probably is. If you want less output, try removing the short, & as was noted above, if doing that damps things too much, short it out again.