Audioguy - what are your room dimensions? Back when you didn't have the thumpiness, how many and which subwoofers did you have, and where were they placed? Now with your current thumpiness of music, you have how many F18s (8?) and is their room placement the same as before?
As previoulsy noted, other subs were Seaton SubMersives. Room dimensions are 19'3" wide, 22' long, 8' high. 2 SubMersives were located in left rear corner, 1 under each end of the screen. Current configuration is 3 Seaton F18's in left rear corner and 2 F18's in each of the two front corners.
If that were the case, then the SubMersives also would have had the thumpiness, and they most certainly did not.I wonder if this thumpiness is a particular low bass frequency being accentuated that is thumping something in your theater?
The easily heard "pros" of the SubMersives was that the mid-upper bass I found much more articulate and cleaner. And the "thumpiness" did not exist. There were no "cons". But we are not comparing Apples to Apples. I had 4 Seaton SubMersives and have 8 F18s (though only using 7 at the moment as I test the rear left corner position.) I would be more than perfectly satisfied with the F18's if I can find the cause of and eliminate this thumpiness. Again, as I previously noted, I can't say for sure that it is the sub but once I visit the room in Atlanta, I will be able to determine if it is my room or the subs.How would you describe the pros and cons of your current F18 subwoofers vs your prior subwoofers?
I am sure you will make the right decision. Again, I think you are probably safe with the F18 since I have not heard this complaint from anyone else. Part of my drive to determine if it is the sub or the room is if it is the sub, I will sell them and most likely purchase the new Funk 18' sub. If it is not the sub, then I will continue to experiment and see if I can eliminate it via Trinnov settings, PEQs and modified target curves.I attend lots of concerts with a fair amount of unamplified music as well - so I want to be sure I don't have thumpiness to my bass!