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Actually, a speaker can be compromised in different ways, outside of running to much power into it. For example, if you live in a high humidity area and you have no type of air conditioning system (which BTW removes some humidity), then high humidity over time can have an effect on the paper...

The Phase Inverted tube was a good answer. However, I forgot to mention earlier that I had swapped it out with no effect either. The problem ended up being the two .047uf Orange Drop coupling capacitors between the Phase Inverter plates, and each EL84 grid. I suspect they had simply changed...

Well, I found the problem... First, I ran the recording port to a separate amp to see if the pre-amp section sounded Ok, and it did. Not dark at all, with plenty of high frequency response. So looking at the schematic, it could be anything beyond the pre-amp stage. Next, I ran the slave port...

High every one! Picked up my very first Mesa not long ago. It's a Studio Caliber DC-2B built in 93'. It seems to be very dark sounding from both channels. The lead channel in particular. Even with the presence and treble maxed out. If I run a Boss GE7 in the loop and bring the 3khz band up...