actually most marshalls ( with effects loops) will benefit from an eq in the loop it provides greater tonal control and ability to add a bit more torque. Even a JCM 800 benefits from the eq in the loop I know this cause I use one with my 2210/4212 combo. My 4100 dr gives up the goods even without an eq. I am quite shocked at the number of individuals who seem to never quit complaining, about most Marshalls, that it "doesn't sound good in their bedroom". I recommend taking one of teh reissues for a test drive before anyone denounces it.