Originally Posted by Matt34
That's appears to be a good size room and while I have no doubt that dual Sentinels would put a smile on your face if you like to listen at or close to reference levels I would opt for a dual Phoneix setup.
It is a good sized room, And I'm pretty confident that the Dual Sentinels will provide the high audible output levels that i'll require since the H100 I already have does a better job than I thought it would (room acoustics). The only concern I have as of now is low end extension. If I get in-room the advertised 16-17Hz useable, then I'll be completely happy no question. I wouldnt even consider another sub at that point because I'm only going to get maybe a few Hz lower... I'm just skeptical right now about how a 12" driver can achieve such flat response to 20Hz and only be down a few dB at 17Hz! We shall see... I've got REW and SPL meter awaiting their arrival!
Originally Posted by Tom Bley
I think you should just wait until you get what you ordered, you may be surprised. Every room is different as well as placement of the subwoofer within that room. So, I don't think it's going to do you any good to have someone post true in-room extension because it's not your room.
Thanks, I agree... I plan to wait to see how well they perform. I understand that in-room response is going to vary wildly from room to room, but I was just trying to get an idea of whether or not its even truly possible to get such low extension from these 12's in ANY room lol. Its an amazing feat if they are really capable of achieving this.
Originally Posted by irishluck73
Time for "educate the new guy"
Everything I've read thus far recommends crossing the sub at 80hz, why would you do that with 1 and then have the other at 120hz? Why not have both of them at 80hz? Also, would having one sub front in front and the other in back be optimal or would that be a poor set up? I've read about the sub crawl for 1 but how would you go about doing it for 2?
The main reason why people suggest crossing over around 80Hz is to prevent the sub from becoming 'localizable'. If I corner load one, it will be somewhat far off to the side and away from the screen (where the action is). I would cross this one around 80Hz to prevent it from being localizable. If I place the other sub between the center speaker and the right tower, then I dont care as much if it is localizable because it is front and center where the action is anyway. Even though it is crossed higher, it should still blend quite well with the mains. But only experimentation will tell the real story, which I will take plenty of pictures and document here! Should be getting them next week.
Also, setting up two subs can be very tricky. You really have to worry about waves canceling each other out. To get an idea of what problems this can cause, when you get your two subs (I noticed you ordered dual sentinels also) place them side by side.... turn one on. Then listen. Then turn the other one on only out of phase (180deg)... the output will actually diminish considerably and sound terrible. This is why most people end up co-locating or spending a LOT of time experimenting. You can get nulls that never existed (because of cancelations, out of phase) and HUGE peaks where the waves are fully in phase.