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--- en:wiki:anhang:anleitungen:the_repeated_stereo_pairs_method [28/09/2016 19:19] – [Initialise the Remaining Workspaces] matt
+++ en:wiki:anhang:anleitungen:the_repeated_stereo_pairs_method [28/09/2016 19:39] (current) – [Step 2: Gain Management and the LFE Channel] matt
@@ Line 190: / Line 190: @@
 ==== Step 2: Gain Management and the LFE Channel ====
-COMING SOON!
+This configuration is summing multiple input channels into one subwoofer output channel as well as applying a +10dB gain increase to the LFE input channel. If you simply use the convolver cfg above to do this, you will digitally clip the subwoofer channel during this process. This diagram illustrates the signal chain
+{{http://cdn.soundandvision.com/images/archivesart/805bass.4.jpg}}
+This means there needs to be some gain adjustments performed on each channel both before and after summation to avoid clipping. In particular note that the optimal implementation is likely to require an awareness of gain structure across your signal chain as it may leverage the input sensitivity and downstream amplifiers.
+One jriver centric implementation when using a 5.1 output format is;
+Making Room for Summation and Adjusting the LFE channel
+  * move a PEQ block above the convolver
+  * add an "adjust the volume" option, set gain to -15 and channels to "Left, Right, Centre, SL, SR"
+  * add an "adjust the volume" option, set gain to -5 and channels to "sub"
+Recovering Gain after Summation
+  * move a PEQ block below the convolver
+  * add an "adjust the volume" option, set gain to +15 and channels to "Left, Right, Centre, SL, SR"
+  * adjust downstream output gain/input sensitivity on the subwoofer signal chain to recover 15dB relative to the main channels
+Note that this implementation allows headroom of 5dB (in the LFE + low passes) before digital clipping will occur. A theoretical worst case signal will require about 3dB of additional attenuation (and subsequent recovery) to pass through cleanly. This sort of signal is exceedingly rare (non existent?) so it is a decision for the user as to how much headroom to leave.