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Basically is anyone still using the analogue outputs on a 93/95/103/105 and if so what level do you set the sub output to? I find that matching to the same as the speakers at 75dB is too low, but I'd rather be more scientific than just turning it up/adjusting by ear if there is a specific setting requirement.
Please don't suggest that I go on the owners thread...
(Or at least if you do, show me a suitable search term that can find the answer since it isn't in any FAQ that I can see and the search is useless if I use 'level' or 'subwoofer').
Audiosceptics accept audio trials using 25 people. A recent Oxford study with over 353,000 patient records from 639 separate clinical trials shows for every 1,000 people taking diclofenac or ibuprofen there would be 3 additional heart attacks, 4 more cases of heart failure and 1 death every year.
I'm being told that it's easy to find, yet I couldn't find it despite doing various searches, a simple link might have been helpful...I often post on the projectors, calibration or video processor's sections and find that I repeat the answers/post links to common questions (and via PM too), but if I know the answer then no harm done, plus hopefully Karma will return the favour to me.
What I'm trying to confirm is that when using an SPL meter with the test tones should the sub test tone read 90dB if the speakers read 75dB? Since the test tones are usually 30dB down from reference, this would imply that the sub would reach 120dB at reference at my seat. (Not that it would as it would be clipping long before then). Since I understood that the sub can peak at 115dB when at reference that's where I got the 10dB more figure from (115dB minus 30dB equals 85dB for the test tone), but I've not been able to confirm this, only the 15dB figure posted on this thread.
Ah well, it's mostly academic at the moment since my sub isn't working properly having bottomed out a few times lately, so I've had to set it lower until I sort out a more heavy duty replacement.
It seems that setting the sub SPL level 15dB higher than the other speakers is NOT what is required and I think this is where the confusion has been at least for me. I'd got the impression that the sub should be set to READ 15dB higher than the other speakers when playing the test tones.
Oddly enough because I've reduced my sub level it now measures about 5dB above the other speakers instead of 10dB, so by fluke I'm now around the level it is supposed to be. Of course it sounds a bit 'light' to me, but I think part of this is a dip in my sub's response: My next sub will have a DSP that allows much better EQing, so I think I'm just going to get familar with REW.
I'll post this quote to help the OP, but bare in mind this is from the Oppo BDP93 thread and as mentioned previously the 103/105 may be different. (My bold).
Thanks again to JazzGuyy for pointing me in the right direction.
The crossover setting only affects the frequencies steered from "Small" speaker channels to the Subwoofer output. The full range of LFE is always present on the Subwoofer output (assuming the Subwoofer is set to ON). I also recommend you turn Dynamic Range Compression OFF.
There was a bug early on in the level of the built-in test tones, and frankly I haven't checked to see if that was fixed.
I recommend you use the LPCM calibration tracks from "AIX Audio Calibration", Blu-ray, to set your levels. It is best to do this with an SPL meter (set to "C" weighting and "Slow" response, and pointed straight up, held at arms length, at seated ear height, near you primary seating position -- keep the tip of the meter away from seat backs or other blocking/reflecting surfaces such as walls).
To check things are also correct for SACD playback, I recommend using tracks 43-48 of the 5.1 layer from "Stay in Tune with Pentatone", SACD. Do NOT use the similar sounding Channel ID tracks earlier on that SACD as the LFE level for those is deliberately set high to make it easier to hear when doing a basic wiring check.
When setting up the necessary +15dB boost for the subwoofer output, it is best to do that external to the player. I.e., leave the Subwoofer volume trim in the Oppo at 0dB (to prevent clipping of the pre-amp input at the other end of that cable). Note that if you are running through an AVR, the AVR may very well provide +10dB of that by default, and may even have an option to provide the full +15dB. Otherwise you can raise the volume knob on the sub to get the Analog levels correct and then also LOWER the Sub volume trim in your AVR for your digital audio sources to compensate. Check both this Analog and your Digital Sources to make sure everything is set up correctly.
NOTE 1: If *ALL* speakers in the Oppo are set to either OFF or LARGE then you *CAN* safely use up to +5dB Subwoofer output volume trim in the Oppo without worrying about potentially clipping the input at the other end of that cable.
NOTE 2: Unless your room is quite large or has substantial acoustic treatments installed, "Room Gain" in your listening room may be adding a small bass boost below the crossover frequency range. Values of 2-4dB are typical. This is a normal room response characteristic that is desirable to retain. Since the Subwoofer test tones from calibration sources are all in those frequencies, it is NORMAL for the "correct" Subwoofer SPL level to be a few dB higher than for your other speakers. See the Audio Theory forum here for more info. Ideally this would NOT be happening for higher bass such as the top end of LFE (90-120Hz), but unless you are very lucky, you'll need a Room Correction system to achieve this. I'm simply saying don't be surprised if you find you are happier setting the Subwoofer SPL a few dB higher than your main speakers. Alternatively, if your Subwoofer is flush to a wall or corner, its lowest frequencies (below 30Hz) may be getting an UNdesirable boost due to what's called "Boundary Gain". This would argue for setting the SPL a little lower. The bottom line? Trust your ears.
It just stemmed from a thread about my subwoofer and I mentioned I was running it 10dB higher (SPL meter reading) than the speakers. A few people asked me why I and couldn't remember exactly where I'd seen it,hence the search. From this research it seems that I was probably running it too 'hot though since I was listening at -10db below reference the sub would have been close to reference. Obviously it can't cope on certain soundtracks with very low bass, such as below 20Hz.
Glad to get to the bottom of it all since I prefer to be scientific about these things (even if I may forget in future how I came to this conclusion ). Next stop is a new subwoofer (possibly DIY) with a decent amp and DSP so I can really fine tune it; at least I'll know that I'm not overdriving it now.
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