all hail the V4-B and its' modern day decendant, the V4B-H...Ampeg's ONLY head with a secret sound-shaping button on the back panel named after a Led Zeppelin Album...( Presence ) My question: The V4B-H is rated at 100 watts maximum power output at 8 ohms. But it's also rated at 100 watts power output with a 4-ohm loan. Why doesn't the 4-ohm rating jump up like most other amps? Any guesstimate on the actual 4-ohm output with this 2/3's of a SVT head? I believe Ampeg is being conservative with its' ratings.