Originally Posted by Thxtheater
Bob and All,
Now you piqued my curiosity and question: I do, indeed have true full-range speakers that go -3dB at 23Hz and -6dB at 20Hz and -10dB at 17Hz. They go up to 45kHz. I also have a sub that goes to 18Hz at -3db.
Movies are fine and optimized. No complaints with movies.
However, for music only
, I want to get the optimal configuration with my full range speakers. Right now, I'm indeed cutting off at 30Hz. However I'd like to test and try overlap of both the sub and my full-range speakers between 30Hz and below. The reason for this is that the room is very, very large (that's why I have full range speakers and a 15" sub). I feel as though I need just a bit more weight at the bottom end---not for explosions, etc, but for appropriate weight and impact of instruments at lower frequencies.
So, if I want to test an overlap both the sub and the full-range speakers at the lowest frequencies:
- What is the best way/practice to overlap full range and a sub? I recall seeing it once in the manual and can't find it again. I don't know if this was with my 20v or with my 50v.
- Does Anthem recommend this approach in my specific situation (I recall that they don't recommend overlap)
- Are there other configuration options/suggestions? There's no specific LFE channel in music, so it's not like I can just turn up the DB in the speaker config.
Am I just barking up the wrong tree? Any thoughts are much appreciated.
Attempting to circumvent ARC and force overlap is a bad idea. The concept (known as SuperSub in the Setup menu) is a hack that predates ARC which was evidently put in for marketing reasons to compete against other systems that were touting the extra boomy bass you could use to rock your neighborhood if you didn't care a damn about actual calibrated audio.
It is a GOOD idea to allow ARC to use BOTH the Sub and Mains when setting up your Music solution -- presuming you have a decent Sub in the first place -- as that gives ARC more degrees of freedom to construct a well calibrated solution. But let ARC do its thing. Always set "1 Sub" in Setup when using ARC (even if you have more than 1 Sub). Never use SuperSub.
In general, there is a tradeoff in Sub design between how much volume they can produce and how accurate they are. My Velodyne DD series Sub even has a "servo" adjustment setting where one end provides maximum output and the other end (which I use) provides maximum accuracy.
My recommendation is that you buy a Sub which tests as being highly accurate, as well as being able to go quite deep into low frequencies, and then use that to support the low end of your speakers EVEN IF those speakers are sold as "full range". If such a Sub doesn't produce enough volume, buy two.
You must understand that there's quite a lot of guff out there in bass specs for main speakers. Even well engineered full range speakers may only be able to meet their low frequency specs when played at lower volumes. If your speaker does not have powered woofers, odds are a separate sub (of decent design) will do a better job despite the specs for the speaker.
This is why I recommend pairing even "full range" speakers with a decent Sub setup -- albeit perhaps at a low crossover like 30Hz so that the Sub is only handling the lowest portion of steered bass. The sub will ALSO be handling the ENTIRETY of LFE channel content, so it needs to be a good quality -- full bass range sub -- not just a thumper suitable only for those lowest of the low frequencies. LFE content is, by design, where LOUD bass resides. And so it makes sense to have the Sub handle that as the bass capacity of full range speakers will be weakest when asked to reproduce LOUD bass.
--BobEdited by Bob Pariseau - 9/5/12 at 3:39pm