Subwoofer

Í would never advice a subwoofer which is not sealed. Each single part to improve the timing is an advantage in accuracy and integration. When you use subwoofers with a 15 inch driver, you get a more natural sound. Also with more authority.

@ricred1 : I will send you a personal message this weekend. I had to find out how I can send a personal message.

My closed box Miller&Kreisel subs are paper. They can sound shockingly natural with percussion. I strongly felt I got on the right path with CB and paper after having a bunch of good quality OB subs with a range of different cone materials. Rythmik's are my next subs of choice, again with CB and paper. They left me as if not more impressed than the MK's. It wasn't my listening environment and I'm anxiously awaiting to hear what they do in my own space.        

There are many subs with 15" drivers, all sounding a little different from each other. Which gives "a more natural sound"? The one you own, of course ;-) ! The 12" and 15" Rythmik subs, both with aluminum coned woofers, sound exactly the same---not just very similar, but identical. The 15" just producers more output, due to it's larger cone area, longer cone travel, stronger motor, higher-watt amplifier, and larger sealed enclosure. But the sound characteristic? Indistinguishable from the 12". Rythmik designer/owner Brian Ding says so, as do Rythmik owners having both 12" and 15" models. But hey, feel free to "believe" whatever you want.

For me ( born perfectionist) audio is comparing and testing.....over and over again. This part never stops. In almost 18 years of time I have done thousands of tests in sound&vision. Only to find those products who give the best results. Because inferior products don't add anything to the world of audio.

For me audio is not about good, but only about the best. Because this way you will get only clients with a big smile on their face. 

In almost 18 years of time I learned that over 95% of all products in audio are not worth it's money. 

Bass is not supposed to be fast. If it were it would be treble. Bass has a much longer wavelength than treble or midrange and takes longer to develop. If your sub seems muddy it's probably because it's crossed over to high or turned up too high.

In addition a good sub will increase the size of the soundstage. A sub that can go down to 20hz or below can better produce 27 or 40hz much easier than speakers that go down to 27hz.