Hi, Jimmy. I will try to only talk to you about the Simplex Lite. The sx24 is a smaller coil and won't go as deep as the sx28. But not by much in my testing. Mybe an inch at most. In parks I us the sx24 to help with the trash. To help going deeper I only notch out the ground. To do that I just turn the Iron on, I want to hear it. I never run the sensitivity over 25. The higher the sensitivity can stop you from finding smaller and deeper targets. In fresh water you don't have to run it in Beach mode. Beach mode is more for salt water. Try field mode first its deeper. You can't change the recovery speed with the Lite. What's nice about the Ultra is the recovery speed adjustment. The slower the recovery speed you have to sweep it slower but its deeper. I'm a coin and jewelry hunter so I prefer smaller coils. Both the Lite and Ultra will have the same depth with the same coil on them. Thats why we all buy more coils for each detector. I have more detectors than I need. I have one that I paid over $1400 for one that can have trouble with certain 10-inch coins. Yes, the Legend and the Simplex have the same headphone plug with the adapter that comes with it. I'm retired and I meet 2 times a month with some friends, and we only use the simplex detectors.