I would like to say thanks to all whom gave me advise. A big thanks to Ampeg support J.Hayess. My ProIV is OK. The mono Bridge is to much for my 4 ohms 2X10XLT Eden. But in stereo it will be safe for both. In larger gigs I'll use my Carvin 8 ohms 1X15 as well. I would like to get the 600 watt 4 ohms Carvin soon. ( sweet talk the wife! ) My dream would be to get the Ampeg 4X10 with a peak of 1200 watts. I use a low " A " which is 27.5 hz, this cab has a low harmonic of 27 hz.Iit should sound sweet. Thanks again to all!