Official OPPO BDP-103 Owner's Thread - Page 829 - AVS Forum | Home Theater Discussions And Reviews
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post #24841 of 24843 Old 10-15-2017, 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?

Jeff
Feature.

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 24843 Old 10-15-2017, 02:13 PM
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Quote:
Originally Posted by Bob Pariseau View Post
Actually what happens during Crossover processing is:

LFE > -5 dB attenuation
Steered Bass > -15dB attenuation
Summed
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.

--Bob
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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post #24843 of 24843 Old Yesterday, 06:09 PM
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I'm experimenting with using the 103 as a preamp, connected directly to a multichannel power amp via analog outs. Yes, I know it's not designed to be used that way. The only "amp" I've tried so far is a vintage Marantz stereo receiver, with the Oppo's FL/FR analog outs connected to the "main in" of the Marantz. With the Oppo's volume control at 100%, the volume through the Marantz was just barely loud enough. The "main in" goes straight to the power amp section, so there's no volume control on the receiver in this configuration.

I'm contemplating using a pair of Adcom stereo power amps to power my 4.0 setup (actually 4.1 but my subs are powered and can be fed from the Oppo's sub output directly). The power amps have an input sensitivity of 0.97V. I don't have the amps available yet to test this out.

But several of you have claimed in this thread that "many" folks are successfully driving power amps directly. If you are, can you please identify which amplifiers can be successfully paired to the 103? I trust this thread would be an acceptable place to do this, since it'd directly related the 103. I might even suggest adding the info to post #1 for reference.

And a quick question, based on something I read earlier about 30 pages back....is the 105 more likely to work than the 103 in a setup like this?

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Oppo Bdp 103 3d Blu Ray Player , Oppo Bdp 105 Blu Ray Player , Oppo Bdp 93 Blu Ray Player , Oppo Digital Inc

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