Official OPPO BDP-103 Owner's Thread - Page 829 - AVS Forum | Home Theater Discussions And Reviews
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post #24841 of 24842 Old Yesterday, 12:40 PM
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Originally Posted by pepar View Post
Hi Bob,

Is this a feature or a bug? If the former, how?


When Crossover is engaged additional "steered bass" from the main speaker channels is summed with the LFE content going out on the Subwoofer Analog output.

LFE content is recorded -10dB down so that there is headroom for recording *LOUD* bass without risk of clipping the preamp input that receives the signal. This means that +10dB of Sub Boost needs to be applied external to the player so that the Sub content (LFE in this case) is matched in level with the main speakers content. Typically AVRs do this, but if necessary it can also be done by raising the volume knob on the Sub itself to achieve the proper level.

But with Crossover engaged, additional headroom is needed so that the combo of LFE and steered bass still does not have the potential of clipping the preamp's input. So an additional -5dB of attenuation is applied. This means that when Crossover is engaged the required Sub Boost -- still external to the player -- is +15dB.

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post #24842 of 24842 Old Yesterday, 02:13 PM
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Originally Posted by Bob Pariseau View Post
Actually what happens during Crossover processing is:

LFE > -5 dB attenuation
Steered Bass > -15dB attenuation
Result is in balance and needs +15dB Sub Boost external to the player.

In the case of DSD, the LFE component, if present, is given -10dB attenuation in the player so that the same Sub Boost that works for everything else also works for LFE. This is true WHETHER OR NOT you are using DSD-Direct-to-Analog Conversion. However, when you are using DSD-Direct-to-Analog Conversion, Crossover processing is not possible, so the output is treated as if you had all speakers set to Large -- meaning +10 dB Sub Boost is needed external to the player and the main speaker channels retain their full frequency range.

Fantastic! I wonder if any of the other universal players on the market are this smart. Thanks for the follow up.

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