I have a NAD C350 amp and was using an old pair of Mission speakers. The sound was good/ok with CDs and LPs. Unfortunately the Missions got damaged so I got some Castle Knight 3 speakers off EBay. They sound fantastic when playing CDs, the bass is amazing and a joy to listen too, however when playing LPs not so good, tinny and lacking depth. So strange as the sound playing CDs is so good. Does anyone know what is going wrong here. Should I upgrade the speaker cables or just change the speakers.