Hi there! I have the SVT-4PRO, and the sound is "big", lots of powerful bottom end (nice for my B-string), but I can't get that nice "tube-growl-sound" of this amp. Right now, I have a possibility to trade it for an Ashdown ABM500 EVO II. Has the ABM500 EVOII more warmth and rounded tone (tubey-like) than the SVT-4? Has the ABM500 EVOII the same powerful Lows as the SVT-4?