Originally Posted by lilmike2069
I've read over your opinions and different plots of the sentinel a couple of times. Can you give your impressions of how good/bad the low end extension is for the deep bass that is often hidden in movies? Does it dig deep enough?
18Hz at -4dB seems pretty good, but I'm a little new to the sub 20Hz response and the effect you get from it.
i'm sure you are aware that our hearing drops off significantly below 20hz or so. so most of the stuff below that point is being felt, but not really heard. the Sentinel has tons of output down to 20hz, so it'll play pretty much as low as we'll hear.
first off i guess i have to admit that this is the best home theater subwoofer i have heard. it has deeper extension than any i've ever heard and can play louder than any i've ever heard. so i may not be the best to ask since i haven't experienced anything better.
i've watched plenty of movies as loud as i've felt comfortable playing them. i've played both Transformers movies, Cloverfield, Master and Commander, and many more as loud as -8 from reference. not at any point did i feel i was in danger of hurting the sub, it's honestly just as loud as i desired to play them. never has it disappointed me.
honestly it's a little hard to answer your question and almost a little subjective. i'd say i'm pretty good at guessing what a certain frequency is when i hear it, but when you get to the very bottom it's a little harder. it's tough, if not impossible to pinpoint say an 18hz tone from a 22hz tone. i can say that the Sentinel has always satisfied my taste for loud and low bass. it's always been capable of pressurizing and shaking my 2400 cu ft room.
there have been concert DVD's or songs on CD that i've re-listened to with the Sentinel and noticed certain things i never heard before. for example, the Rush, Live in Rio concert dvd when the drummer does his crazy drum solo there is some stuff that's around 20hz that i never knew was there. i was never really a huge movie buff before getting the Sentinel, so i can't really cite any specific examples in movies.
there are people who require their response to be flat to 10hz, some even seek 5hz extension. so it's tough to say that 18hz extension is all you need. the problem is that while one person is completely happy with 20hz extension, the next person will desire flat response down to 5hz. you can say it's pointless, but obviously to some people it's not. maybe some day i'll attempt it, but not at this point in my life. the general consensus seems to be that 98% of the content in movies is above 20hz and anything below that in movies isn't all that important.
i've said it numerous times in this thread already, but i'll say it again. my goal was to have a sub that sounded excellent for music and could handle music at any volume level i desired (which is sometimes very high), but also be able to survive an action packed, bass heavy movie at -10 or so from reference level. i achieved that goal 110%. my prior sub could handle the music part pretty well most of the time, but failed big time when i tried watching a movie.
hopefully that helped a little.