I just bought an Ashdown MAG 300 12"x2 combo. I use a 5 string Carvin neck through. I'm not too familiar with amplification, as I've recently started playing. When I plug into my amp the B sound pretty distorted, is this normal or you think something is up with the amp? I've heard and read lots of great reviews about the MAG 300 so I'm suprised that is seems to "fail" to deliver that low B sound clearly. Any concerns?