Bryan Acevedo
Second Unit
- Joined
- Aug 7, 2001
- Messages
- 290
After reading for months on this forum - there always seems to be a question of how to calibrate the sub level. It seems this is the biggest problem with home theater setup. I was thinking about it the other day and came up with some hypothesis as to why it may be so hard to actually calibrate a sub correctly. I thought I would post them here, to see what others thought about them, and see if it makes sense.
1) Setting the Sub to match the output of the main speakers is sub dependent AND room dependent. It seems that whenever I set my sub to match the mains in output, the bass is very, very weak on everything. I think this is because in MY room, with MY sub, there are some peaks in the Frequency response of the sub. So when I am calibrating to 85 db, I am calibrating one frequency (the peak) to that level. Then when I play back a movie or music, the bass is like 6 - 8 db lower than it should be, because the bass is at a different frequency than what I calibrated at. The reason I think this, is because when I play the test tones for the main speakers, the needle on my RS SPL meter stays at one level. However, when I try to calibrate my sub, it jumps all over the place. I can never get it to stay at one level. I think this is where the problem for most of us lies. Where do we calibrate it at? Does anyone else have this problem? I would be interested to know why my needle jumps around on the sub level only.
This would also make me believe those with a parametric EQ that can get rid of these humps would have an easier time with calibration. True?
2) Maybe setting the sub that low just sounds weak, because we are all used to a nice mid-bass hump from the entry level stuff we all started out with. I heard a little computer speaker system this weekend at Comp USA - this little tiny sub had some nice bass punch. In no way can it match the output of my Velodyne SPL1200 - but it did produce a nice punchy bass sound. Maybe we are all just used to this, and setting up the sub correctly (read flat) sounds incorrect. I don't know - but this is a thought.
3) Maybe music and movies really do need different settings for subs. Movies have that LFE channel at +10db, but music doesn't. Even when you set your sub up at a low level, that extra 10db can really make it crank for a movie, but for music it can sound very weak. Just a thought.
It could be combinations of all these things - but it amazes me how many questions there are on this one topic alone, and it seems that everyone has a different way of doing it.
What I have done is calibrated my mains with the SPL meter, and just calibrated my sub by ear with some music I am very familiar with, and know how I want my sub to sound on it. It may not be totally accurate, but it is the way I have found to actually enjoy my system more. I am interested to hear what others have done with their sub setup.
Bryan
[Edited last by Bryan Acevedo on November 05, 2001 at 02:07 PM]
1) Setting the Sub to match the output of the main speakers is sub dependent AND room dependent. It seems that whenever I set my sub to match the mains in output, the bass is very, very weak on everything. I think this is because in MY room, with MY sub, there are some peaks in the Frequency response of the sub. So when I am calibrating to 85 db, I am calibrating one frequency (the peak) to that level. Then when I play back a movie or music, the bass is like 6 - 8 db lower than it should be, because the bass is at a different frequency than what I calibrated at. The reason I think this, is because when I play the test tones for the main speakers, the needle on my RS SPL meter stays at one level. However, when I try to calibrate my sub, it jumps all over the place. I can never get it to stay at one level. I think this is where the problem for most of us lies. Where do we calibrate it at? Does anyone else have this problem? I would be interested to know why my needle jumps around on the sub level only.
This would also make me believe those with a parametric EQ that can get rid of these humps would have an easier time with calibration. True?
2) Maybe setting the sub that low just sounds weak, because we are all used to a nice mid-bass hump from the entry level stuff we all started out with. I heard a little computer speaker system this weekend at Comp USA - this little tiny sub had some nice bass punch. In no way can it match the output of my Velodyne SPL1200 - but it did produce a nice punchy bass sound. Maybe we are all just used to this, and setting up the sub correctly (read flat) sounds incorrect. I don't know - but this is a thought.
3) Maybe music and movies really do need different settings for subs. Movies have that LFE channel at +10db, but music doesn't. Even when you set your sub up at a low level, that extra 10db can really make it crank for a movie, but for music it can sound very weak. Just a thought.
It could be combinations of all these things - but it amazes me how many questions there are on this one topic alone, and it seems that everyone has a different way of doing it.
What I have done is calibrated my mains with the SPL meter, and just calibrated my sub by ear with some music I am very familiar with, and know how I want my sub to sound on it. It may not be totally accurate, but it is the way I have found to actually enjoy my system more. I am interested to hear what others have done with their sub setup.
Bryan
[Edited last by Bryan Acevedo on November 05, 2001 at 02:07 PM]