Hey guys, I'm looking to get another 12 string Ovation. I've had three over the years and I have a Celebrity Deluxe 6 string now with the OP-24+ preamp and it sounds great amped, my best one was a Custom Legend stereo and I was a fool to sell her but that's water under the bridge. So the question is, I'm looking at the CC245 Celebrity and they have an OP4BT preamp, it's got a built in tuner with digital display plus gain and EQ sliders. And I've seen another CC045 12 String that looks almost the same but it has an OP-20 Preamp. Does anyone have any first hand experience with BOTH preamps and is so which is better sounding? My first thought is the OP-20 is the better unit but it's just a hunch. I had an Ovation with an OP30 and it sounded great. I played a CC245 @ GC the other day and the OP4BT doesn't sound bad but I haven't been able to test drive a 12 string with the OP-20 preamp. Anyone? I'm pretty sure the CC045 is recently discontinued and the CC245 has replaced it but don't know whether the preamp is better.