I believe set-up is likely the cause. Excellent sound should the the norm with most of the gear you mentioned.
What do you mean when you say bass has been a big disappointment? Quantity? Quality? Too much? Too little?
I'd try moving the speakers away from the wall so the driver plane is 2' from the front wall, and I'd try spreading them farther apart, if possible.
Make sure the tubes in your Modwright and DK are not failing. Failing tubes is a common cause of bad sound that some people attribute to other causes. See member Khrys' recent thread in which he thought his sound problems were due to cabling or speakers...it was faulty tubes.
Also, wiring the speakers out of phase can be a cause of poor sound. It might seem ridiculous, but check to make sure you have the speakers wired properly.
I absolutely don't believe your problem has anything to do with AC. Clean AC will take an already good sounding system and make it sound more three dimensional due to the elimination of grunge in the system, but it won't create more bass, tighter bass, etc.
What do you mean when you say bass has been a big disappointment? Quantity? Quality? Too much? Too little?
I'd try moving the speakers away from the wall so the driver plane is 2' from the front wall, and I'd try spreading them farther apart, if possible.
Make sure the tubes in your Modwright and DK are not failing. Failing tubes is a common cause of bad sound that some people attribute to other causes. See member Khrys' recent thread in which he thought his sound problems were due to cabling or speakers...it was faulty tubes.
Also, wiring the speakers out of phase can be a cause of poor sound. It might seem ridiculous, but check to make sure you have the speakers wired properly.
I absolutely don't believe your problem has anything to do with AC. Clean AC will take an already good sounding system and make it sound more three dimensional due to the elimination of grunge in the system, but it won't create more bass, tighter bass, etc.