I had some polyfil left over from a sub build and decided to try adding some to my DIYSG Fusion 8 Alchemy Towers. They were already lined with egg crate foam. I took a big handful of polyfil and stuffed the entire area around the compression driver. Sort of blocked off that whole top section. None behind the woofers or anywhere else in the cab. I then took some sweeps of one of the towers with the stuffing added vs the other without. Tested with UMIK-1 and REW. Mic stayed stationery 3 feet from speaker pointed at the mid point between the top woofer and the CD. Based on what I see in the measurements the stuffing either did nothing or hurt overall. I hear the distortion results in REW might not be trustworthy but the stuffed speaker had more THD and what looks like a more jagged distortion graph. Then just for the heck of it I decided to test my Pioneer andrew jones tower in this same test setup. The pioneers needed 7db more volume to get an overlapping graph. Surprisingly the pioneers look to measure considerably flatter up until a rising top end. The distortion graph from the pioneer also looks better. I'm sure if I ran this test at reference the distortion on the pioneers would be alot worse. But this backs up my earlier impression that the pioneers sound better to me at low volume. These sweeps were done at -25db. It won't let me upload the mdat.
Here is the stuffed vs unstuffed: (unstuffed in red)
Here is the averaged response of the two alchemys vs the single pioneer: (pioneer in red)
Here is the stuffed vs unstuffed: (unstuffed in red)
Here is the averaged response of the two alchemys vs the single pioneer: (pioneer in red)
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