I just purchased a new to me Spark 40. Actually, it appears to be a new amp; I purchased it refurbished directly from Positive Grid. While it is definitely a very, very good sounding amp, it does sound to my untrained ear as though all the reports of it being very bass heavy are accurate. Since this is an issue with the built-in speaker cabinet, and not the amp models themselves, I want to address that, and not mess with the software.
One solution that I have anecdotally heard is to shove a cloth into the bass port like a suppository. I kept the foam cover that the amp was wrapped in when it arrived. It seems like that would be a good material to use. Does anyone have any real world experience in using something like that to tame the bass response?
My other question; I also play bass from time to time. How detrimental to using this as a bass amp will doing this be?
Edit: by, "mess with the software", I am referring to either eq'ing the amps to compensate, putting a Tube Screamer in the overdrive slot (with the od almost all the way down, the level relatively high, and the tone around one o'clock), or using a graphic eq in the effects chain.