Now with my problem... I just bought a SWR 550x which sounds good. I always loved that twangy hifi sound, but once I gigged and pushed it hard the bottom end spooked away. Using a Son of bertha 8ohm. Think it's lack of power, now thinking of buying a SM-900 for $700. From the reviews I've seen the 900 ain't all that. Also thinking about ampeg's svt4 pro. All you Pros out there .........Enlighten me please!!!