Air_US_rev_111.qxd
THE SUBWOOFER & LFE CHANNEL - BACKGROUND INFO
Checking summing phase cancellation
In a basic
Controlling standing waves
It can be very difficult to get two monitors in the right position in order to prevent the excitation of the standing waves. But placing five monitors are even more difficult! Each monitor should play under the same conditions as the others but that is seldom the case.
Three front monitors can normally be placed away from disturbing boundaries to prohibit the excitation of the standing waves. But in small rooms the rear monitors very often are placed in a corner or on a wall. Having the full frequency range reproduced in a monitor like that, there may occur serious problems which results in a poor low frequency sound distribution in the room.
So this is another reason for using bass management. Simply: Only one monitor - the sub woofer - has to be placed in a safe position. The
The LFE Channel
LFE is short for Low Frequency Enhancement or Low Frequency Effects, the first being the original name but the second being the most correct with regard to its application.
It is also referred to as
When reproduced the signal is gained by 10 dB compared to the main channels. This provides a possibility of reproducing occasional
Leading signals to the LFE channel should be evaluated carefully in each case as not all transmission or reproduction systems may include this channel. In the music mix there is no special reason for using this channel unless you are recording the 1812 Overture with its canons and all that stuff.
L
C
R
Ls
Rs
Σ Sub
Low Pass | LFE Gain |
120 Hz
+10 dB
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