Meridian Unplugged - Powered by MrTechGuy.co.uk Forums Discussion Meridian - Systems [G68ADV+BDP83SE]How to setup a 5.1 analog link ?

That was how I thought it worked as well and the difference is only the Default LFE attenuation set in the preset. I always thought Cinema and Discrete were the same one for Music and for Movie Layouts. But they could both be adding 10dB behind the scenes but one preset defaults to taking that 10dB back off.

I'm curious how your testing as well.

If you're using like Video Essentials BD disc it *IS* 10dB low (if I recall correctly). Make sure know 100% what your supposed to measure with your test source.

Except that with a movie track the LFE level is always (analog and digital domain) set to -10db relative to the other channels. And all pre-amplifiers will add automaticaly 10db to the LFE level in the digital domain.


I have put my DEQ2496 with a ECM8000 mic behind the seats at ears level.
I have made a loop on the DVD of Avatar, when the tree is falling.

On my two BSS 366, i have muted all the channels except the sub channel.
And i have measured the peak level with each preset.

So this test can be done with any disk. And even with a disk with a wrong lfe level, it will show the analog LFE level difference compared to the digital domain

Serge.

I have added [music] in the above for clarity.

Which is why one should use the Cinema preset for movies (as it adds 10db to the LFE to bring the recorded level up to 0db relative) and not Discrete as it is for multi-channel music (DVD-A) where the LFE channel is recorded at 0db relative.

What you are measuring is a 10db difference on LFE between the Cinema and Discrete presets; this is correct.

What you need to do is get a calibrated test disc (using Avatar or any movie sound track cannot give quantifiable results) and measure the LFE against the other channels.


Regards,
Carl

Agreed.

** Cinema is designed for Movies

** Discrete is for Multic-Channel Music (DVD-A) ONLY

No point in measuring the Discrete Preset on Movies

Ok



Yes it's a correct behavior between the 2 presets. But the problem is not there.

The problem is the comparison with the same soundtrack sent to the optical G68 input, where the G68 is automatically adding the +10db boost on the LFE channel. (purely digital domain link).
Carl, you agree that there is no possible LFE level problem with such link ?


With the analog 5.1 output of the BDP83, i have to add this 10db boost in the player to reach the same level on the LFE channel when using the Cinema preset (the 1-2 db difference is a difference produce by the G68 input sensibility).



With such a disk you will measure a correct LFE level only when using the cinema preset (that will do nothing to the channel level) AND the 10db boost in the player LFE channel.

Serge.

I agree with Carl, get a known Calibration Disc. It's certainly easier and cheap to have. Your tests may be valid, but I'm not sure how you know what your reference is in digital domain to compare it with analog. Seems very problematic way of doing it, that you'll get your self in a pickle. It's tricky enough getting everything correct and well understood even with the calibration disc never mind without one.

You should get the Oppo hooked up digitally anyway