I have had the same issue along with a few others and began to research methods to fix them.

I have heard/read a few solutions;

1. Using an old bike tire [or similar] attached to the drainage pipe to create a slower water drop.

2. Raise the sump pump so the standing water sits closer to the drainage pump [less distance to drip].

3. Install a better [air tight or thicker] lid for the pit.

I would like to note, I am NOT a plumber nor do I have any plumbing experience. This is purely based on my own research for the same problem. I have yet to implement any of these mentioned [proposed] solutions. However, I thought I would share them to give some ideas for your own search adventures.

I wish the best. Good luck.

I just saw this and thought I'd put in my two cents. I had the same issue with Chinese water torture in my basement. I found some scrap PVC and angled it in the pit so the dripping water would hit it and slide down. Problem solved!

Cost: maybe $0.50?

I like the angled PVC pipe idea, I was thinking along those same lines as I read your post. Also do not forget in finishing the basement you will undoubtedly box in the pump, maybe in a small closet? You can insulate the room to cut down on noise and even attach 1" foam to the inside of the door to quiet transfer of sound through the door.
Contractor John
http://contractorjohn.com

Best to get to the root of the problem. Where is the water coming from instead of trying to mask it.

I used a plastic clamp and clamped an old rag hanging from the pipe just into the water so the water coming from the tile field under the basement would not drip into the pit you do not want water standing in the pipe you want your pump to kick on just before the water gets to the pipe but of course this causes the water to drip after the sump is pumped out while it is refilling.... This stopped my water dripping sound!

what size PVC did you use and can you post some photos. Thanks