Simplified REW Setup and Use (USB Mic & HDMI Connection) Including Measurement Techniques and How To Interpret Graphs - Page 519 - AVS Forum | Home Theater Discussions And Reviews
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post #15541 of 15544 Old Today, 04:56 PM
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Originally Posted by AustinJerry View Post
The LFE track is encoded at 10dB lower than the other tracks. The AVR automatically adds the 10dB back, so there is no action required on your part, nor should you be concerned.
So the reason why REW ends up +10db for the sub LFE channel is because they aren't factoring in -10db to compensate for your AVRs +10db, which is assuming an input of -10db. Wow.

What started all this mess in the first place, I wonder?
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post #15542 of 15544 Old Today, 05:18 PM
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So the reason why REW ends up +10db for the sub LFE channel is because they aren't factoring in -10db to compensate for your AVRs +10db, which is assuming an input of -10db. Wow.
No, the reason it ends up +10dB is because you don't understand how the LFE channel works and therefore don't adjust your system to get the same SPL as the others when measuring.

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What started all this mess in the first place, I wonder?
Someone decided the LFE channel should be capable of 115dB whereas other channels were capable of 105dB. That means the same digital signal will yield different playback levels depending on the channel.
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post #15543 of 15544 Unread Today, 06:29 PM
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No, the reason it ends up +10dB is because you don't understand how the LFE channel works and therefore don't adjust your system to get the same SPL as the others when measuring.
I don't think you understood the question. In REW, it is commonly reported in this thread that HDMI 4 gives +10db over the other channels. Jerry told us this is because the AVR makers add +10db to the LFE channel.

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Originally Posted by Stereodude View Post
Someone decided the LFE channel should be capable of 115dB whereas other channels were capable of 105dB. That means the same digital signal will yield different playback levels depending on the channel.
But if the AVR is adding 10db to LFE, and the LFE track really is, as Jerry tells us, encoded 10db lower by the movie studios, they'd cancel out. Hence the confusion.
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post #15544 of 15544 Unread Today, 08:35 PM
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Originally Posted by Soulburner View Post
In REW, it is commonly reported in this thread that HDMI 4 gives +10db over the other channels. Jerry told us this is because the AVR makers add +10db to the LFE channel.
Yes, that's correct.


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But if the AVR is adding 10db to LFE, and the LFE track really is, as Jerry tells us, encoded 10db lower by the movie studios, they'd cancel out. Hence the confusion.
If the studio wants something in the LFE channel to play at the same SPL as the other channels them they would reduce the signal by 10dB compared to the other channels. However, they're certainly not going to do that for all LFE content. Ultimately, they mix for what they want during playback and encode the signal accordingly. It seems like you're over thinking this 10dB offset that gives the LFE channel an additional 10dB of output capability.
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