I have a customer who has a hot tub in her back yard. She says she can't hear the front door bell ring when she's in the hot tub. I figured I'd just put a second set of chimes in the vented soffit and run a line from the chimes near the front door. Distance from xfmr to front door chimes about 25', and another 25' back to the second chimes. (I hate low voltage...) Both connected; the front rings (barely). Individually they both ring. Any suggestions? She doesn't want/like wireless chimes and wants them on a single button. These chime kits have 2 coils each (1 each for front and back)and only one set each (front) is connected. Thanks for any help.