Speaker Sound

It is awful. When I connect to the woofer it is a faint tinny sound. When I connect to the tweeter, the sound is fuller but flat and dead. 

Do I need jumpers with Biwire speaker cable? Will the cables be enough?

No. You need jumpers now. You’re only running part of your speakers.

Here’s a picture with jumpers. You can make jumpers with short pieces of wire, if needed.

Put jumpers in and be done with it. If you're thinking about bi-wiring for sound improvement, you're looking in the wrong place. Go with bi-Amping.

@fiesta75 +1

One could use a coat hanger as jumpers, just not a plastic one.