Originally Posted by Uprize
I posted the following questions below in the OPPO BDP105 Sound Quality Check thread, but wasn’t sure it was the correct thread so I’m reposting here. Actually, I have since found some answers for question 1 from some of the experts in this forum. Therefore, that leaves Q2 and Q3.
1. What are the preferred analog configurations for 2.1 stereo music and playing movies in a 7.1 set up in the OPPO 105D?
2. What base volume level should be set in the AVR to perform the calibration in the OPPO? Should it be at 0 db, or in the case of the Marantz SR7010 at 80? Somewhere in this forum, I read that I should adjust the main volume in the OPPO to the point where my speakers are level matched at 75db, but there was no mention (or none that I could find) of what offsetting volume level should be set in the AVR to begin the calibration.
3. My subs (I have 2) are already level matched for audyssey processing. How do I handle adjusting the gain on the subs without upsetting the audyssey levels should the OPPO calibration call for it? Do I only adjust the sub trim level in the OPPO in that case?
As a side note, it appears the tweeter of my left front Klipsch RP280F is blown (I am only getting sound from the woofers). All connections are intact. Not sure how it happened but I’ll be contacting Klipsch and my dealer shortly.
If you have a 7.1 speaker setup and want to use Analog out of the OPPO, cable 7.1 Analog to your Marantz. Set the OPPO to a 7.1 down-mix so all channels are available to the Marantz.
For the rest of your questions, you first have to decide whether you want to use the Audyssey room correction processing in your Marantz or bypass it. For the Marantz to do room correction and crossover processing on the Analog input from the OPPO it must first re-digitize that input because such processing is done digitally. Then, after the processing, the results are converted BACK to Analog to send on to your speakers -- using the DACs in the Marantz.
The quality of the re-digitizing, digital processing, and re-conversion back to Analog in the Marantz may conceal what you are trying to hear as the Analog result from the use of the DACs in the OPPO.
The alternative is to configure the Marantz to "pass through" the Analog input from the OPPO doing *NOTHING* but Volume control. I.e., you would be bypassing room correction, crossover processing, down-mixing, surround sound processing, speaker distance adjustment, audio "enhancements" of any sort, etc., etc. All such stuff is done digitally, and if you don't want the Marantz to re-digitize -- and then use its DACs to convert BACK to Analog afterwards -- you need to forego ALL of those features in the Marantz. You need to check the Manual for the Marantz -- and the owner's thread here for your model -- to determine how to do that in your Marantz. Be aware that some AVRs have two levels of Analog Bypass settings. One bypasses all the processing but still does the re-digitizing. You want the other that doesn't even do the re-digitizing. Again check you Marantz info sources.
Now, if you LIKE what the Marantz does for audio processing, believe it is good enough quality to let you hear everything you want to hear from the OPPO, and want to continue using it, then your job for configuring things is SUBSTANTIALLY easier.
First of all, you may want to simply use HDMI Audio to the Marantz instead. That eliminates the conversion to Analog output in the OPPO (using the DACs in the OPPO) and the re-digitizing in the Marantz, since the audio input is already Digital.
But if you want to use Analog from the OPPO -- perhaps for comparison -- you just have to keep in mind that you have the Marantz configured to do ALL THE WORK. So you want to set the Analog output of the OPPO to do *NOTHING*.
So in the OPPO, set all speakers to Large (which turns off Crossover processing) and with 0dB Volume trim. Set all speakers equidistant -- any distance will do so long as they are all the same -- you can just use the factory default 12 foot values. Set DTS Neo:6 Mode to OFF. And as mentioned above set Speaker Configuration > Down-Mix to 7.1.
Again, you can DO all those simple settings because the Audyssey solution in your Marantz will actually handle all this speaker configuration stuff for you including speaker level trims and crossover processing.
If you check your speaker levels afterwards with a calibration disc, it should just work. Because the OPPO is sending equal values for all speakers and the solution in the Marantz is already applying any necessary Volume Trims.
That just leaves Main Volume to set in the OPPO. Normally when feeding Analog into a pre-amp like this you would set Main Volume to 100 (or FIXED, which does the same thing). This sends a full scale signal to the Marantz. You then do Volume adjustment in the Marantz to achiever a comfortable listening level.
The only reason to set a Volume lower than 100 in the OPPO is if you discover the Analog outputs are clipping the inputs of the Marantz for louder audio passages. This will sound like a "harshness" in the loudest passages that goes away if you lower Volume in the OPPO. Typically if present at all it will only take a few steps reduction in Volume in the OPPO to prevent this. Test with your loudest audio passages. This is a set once and forget setting. So if you find Volume 96 in the OPPO insures no clipping when playing your loudest audio passages, then you just leave it at 96 for everything you play.
Things are more complicated if you want to BYPASS all the processing in the Marantz. First you have to figure out how to set the Marantz to do that. Be sure you don't disable the Audyssey solution altogether, as you probably still want to use it for other sources.
When you have figured out how to bypass all that stuff -- how to get true Analog "pass through" in the Marantz, leaving nothing but Volume control -- then you need to start setting things up in the OPPO to handle the processing the Marantz is no longer doing.
So for example, if you want bass steering from the main speaker channels to your Subwoofer you have to set speakers SMALL in the OPPO and pick a suitable Crossover frequency. You also have to enter real speaker distances in the OPPO. You have 7.1 speakers in your setup so you don't need to change the Speaker Configuration > Down-mix. Leave it at 7.1 -- even when you are playing Stereo content and want 2.1 output.
I'm assuming you will continue to use the Marantz for Volume control, even in this Bypass configuration. If so, the same answer applies as above. I.e., you will NORMALLY want to use Volume 100 from the OPPO (or FIXED) to send a full scale signals to the Marantz. Then use Volume control in the Marantz to set a comfortable listening level. As above, you may discover later that you need to reduce Volume a few steps below 100 in the OPPO to eliminate any possibility of clipping.
And that leaves speaker Volume trims. To do those, play a calibration track, such as the LPCM 7.1 Channel ID track from AIX Audio Calibration, Blu-ray. Leaving Volume at 100 in the OPPO, adjust Volume on the Marantz to get 75dB SPL measured from the Left Front speaker.
Leaving Volume in the OPPO and Marantz set that way, go around to all the speakers and adjust the individual Volume Trims so that all speakers produce 75dB SPL. Now look at the results. The Trim for Left Front will of course be 0dB because of how you picked the Volume in the Marantz. If any of your Trims are positive values, reduce *ALL* the Trims the same amount so that the LARGEST Trim is 0dB and every other Trim is in NEGATIVE values. So lets say you had Trims that were all between 0 and -3dB except for one that was +4dB. You would lower ALL of them by 4dB so that the large one was now 0dB and the rest were -4 to -7dB. You can make a mental note that the Volume level you have set in the Marantz would need to be raised 4dB to compensate if you wanted to reproduce your 75dB calibrated levels.
The Subwoofer channel needs special care here. The Analog Sub output signal is reduced in voltage compared to the other speaker channels to allow for *LOUD* bass without clipping. That means the Sub signal needs to be increased to match the level of the other speakers.
This Sub Boost should be applied *EXTERNAL* to the player -- for example by raising the volume knob on the Sub itself.
The amount of required Sub Boost is:
1) +10dB if no Crossover processing is happening in the OPPO, or
2) +15dB if Crossover processing *IS* happening in the OPPO.
Typically an AVR like the Marantz will automatically apply +10dB of Sub Boost when you pass the Analog Sub signal through the Marantz. So what if you need +15dB? Well the Marantz may have a setting for that (which with any luck will only apply to this Analog input), or you could adjust the Volume knob on the Sub.
But if you adjust the volume on the Sub that will screw up your Audyssey solution for other sources!
The answer to that usually comes from the fact that when you set up Analog "pass through" in an AVR, its speaker specific trims are also bypassed. So what you can do is raise the volume knob +5dB on the Sub -- to get your pure Analog from the OPPO to have the right Sub level -- and then set a -5dB Sub volume attenuation in the Marantz for all your Digital sources going through Audyssey.
The bottom line is that if the SPL tests you do with the calibration track show the Sub matched in SPL level to the other speakers then you have achieved the correct level of Sub Boost. But you do NOT want to do that by raising the Sub output volume trim in the OPPO. Arrange for the Sub Boost to happen external to the player.
The fact that you have two Subs complicates things quite a bit. Again the trick is how to make sure things are set up correctly without screwing up your Audyssey solution.
The Subs need to be matched in volume so they share equally in the bass output. And they also have to be matched in Phase. Any corrections Audyssey might be making for those WILL NOT APPLY when you are using Analog "pass through". So you need to make manual adjustments that work for Analog "pass through" -- using the controls on the Subs themselves. Making adjustments on the Subs will of course screw up your current Audyssey measurements.
By the way, if the Subs are not equidistant, the distance setting you should use for them in the OPPO is the average of their distances. Note that you have to set speaker distances FIRST before you try to adjust Phase to match for the two Subs. Then when adjusting Phase, the usual trick is to power one Sub at a time and adjust its Phase control to best match with your Left Front speaker. When each Sub individually is in Phase with Left Front, then they are also in Phase with each other.
The solution to THIS dilemma is to set up things to work correctly for Analog audio from the OPPO "passed through" the Marantz. And then, leaving the resulting settings on the Subs unchanged, re-do your Audyssey measurement and calculation pass to come up with a new Audyssey solution for your Digital sources based on the newly revised output of your Subs.
There are many possible mistakes you can make in setting up a dual use configuration like this -- i.e., pure Analog from the OPPO while retaining Audyssey for your digital sources -- so it would be wise to confirm the results afterwards by playing your audio calibration test tracks both ways: Analog from the OPPO with "pass through" in the Marantz, and HDMI Digital audio from the OPPO with Audyssey engaged in the Marantz.