Bookshelf & Sub v. Towers. Jul 10, 2011 21:08:03 GMT -5
Post by chuckienut on Jul 10, 2011 21:08:03 GMT -5
However, localization of bass for music playback is another matter and can be distracting. I have not been able to localize bass at 80Hz and less. But to further prevent against any possibility of localization, in my current system, I use the 24dB X/O slope on the sub. And to further reduce such possibility, using the EQ on the subwoofer channel, I reduced all bands above 89 Hz by the maximum -10dB.
Jamrock, you're confusing localization of subs with the spacial aspect of HT sound tracks. Localization refers to being able to locate the sound coming from the sub as opposed to the satellite or full range speaker that's crossed over to the sub.
Spacial cues (panning), on the other hand, place the source of the sound in a 3D space. For example, consider a helicopter with a deep rotor thwap coming toward you from the left horizon, it crosses the center of your screen, getting louder and louder as approaches you, and then passes out of view on the right side of the screen and continues to fly away "behind" you and over your right shoulder. You should be able to locate the sound of that helicopter in 3D space as it makes its journey, however, you should not be able to tell which speaker/sub is contributing to the sounds that you are hearing.
Not sure if I explained that correctly but hopefully you get what I'm trying to convey.
Sorry Mahir, but I have to disagree with you on this. Say for the sake of hypothetical argument that the only sound from the helicopter was a low 30Hz rotor whwap. If you turned off the soundtrack then of course you would know the helicopter was going from left to right from the video cues if it was shown in the movie. Now turn off the video and all you hear is the 30Hz rotor thwap. You would now not be able to tell where that sound was coming from. You would have no way to tell that the helicopter was moving from left to right. The only effect you would hear is that the rotor thwap got lower and lower in volume as the helicopter was going off screen to the right (which you could not see). This is because all the audio cues to the location of the sound are from frequencies above 80Hz or so.
The reason in the actual movie that you know the helicopter is moving from the left to the right (other than the visual cues) is that the fundamentals and harmonics of all of the sounds from the helicopter are reproduced as a sound pan above 80Hz from the L thru the C thru the R speaker and then the volume falls off as the sound approaches the far right. Any sounds you hear below 80Hz are still coming from the sub but the sub is not where you get the localization cues but rather from the main and surround speaker that are reproducing 80H and above sounds.
The same is true when you are listening to a stand up bass in a jazz recording soundstage right. If it is playing a note below 80 Hz, the only reason you still know it is at the right soundstage is because of the above 80Hz harmonics it is also reproducing mainly thru the right speaker.
Note: I use the 80Hz frequency here as an approximate general reference point for being able to locate the sound source.