Ok. So I have a 901 and two atty's for it. A couple of weeks ago one of them started to not hit so well so I tried the other. That one had great hits until a couple of days ago. I checked the resistance of them when I first got them and the low bridge one was about 4.5 ohms, the high bridge one was running about 3.5 ohm. The lower resistance one was the one giving the best hits. I just checked them both again and the low bridge is at 45 ohms (haven't used it in two weeks) and the high bridge (good atty) is at 5.5 ohms and doesn't hit good at all any more. Any ideas to make them better. I definitely need to order more atty's also want to get a 510. Thanks for any advice.