Both the GR Research and the Bully subs were in my systems at different times each for month or two. I made them as gifts for my two sons. I liked both of them better for music than the sealed Tumult sub that I have. I never sat down to compare in detail the difference between the Tumult and the others other than the general observation that they each seemed a little "tighter" sounding. Of course they couldn't compete with the big Tumult in sheer output. The Bully was in 3+ cubic foot sealed box. I used identical plate amps with an equalizer from Partsexpress for both subs. Each sub alone struck me as having adequate output for music with the Bully having plenty of output for home theater. I hesitate to compare them in sound quality since I didn't have them at the same time. If you were going to build one sub and sound quality and output were the goals the Bully would be the choice. At 15" with 18mm of xmas it can be easily take a boost from a equalizer to bring up the very lowest frequencies. On the other hand if you are thinking of multiple subs the GR Research is half the price. If two Rythmik subs lacked the output for you, you might be happier with the Bully. My son uses his in room about 12'x 18' and has to turn it down quite a bit because it can vibrate things on the walls when watching dvds. When it was used in my house it was in a much larger room and was more than adequate for music(as was the GR Research)
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