Yeah that E140 is 8 ohms, right? so the Rumble 150 is something like 80 watts at 8 ohms while the Rumble 350 is 220 watts at 8 ohms. IIRC what the schematics say.A few months ago I picked up a used Rumble 150 head on Craigslist for $60. Worked great with my Ampeg SVT15 (with JBL E140), however I felt the JBL could take more power so I looked into swapping out the IcePower 50ASX2/BTL for the IcePower module used in the Rumble 350 head (125ASX2/BTL). The lowest price I could find for the 125ASX2/BTL was $150 shipped from China. I eventually went with a used Rumble 350 head for just a few dollars more, and I can sell the Rumble 150 head and recoup some cash. Now I'm just waiting for the Rumble 350 head to arrive!








