![]() ![]() Not necessarily germane to the original post, but since we're talking arbitrary reference scales and standards, I'll toss out Dolby Digital's "Dialog Normalization Value". Have a read.When I demo my system for people, I still do it -10 dB under reference, buy now you know why I need such a powerful sub - View image here:. You can calibrate using something like Avia and a SPL meter, or if your receiver has an auto-setup feature and mic, it will do it for you.Google brought up this and this. 105 dB peaks as mentioned above.Before calibration, you don't really have any idea what the volume setting represents in terms of actual output. 85 dB is an average value.The point of the -xx dB system is to calibrate first, usually to reference level so that when you get to 0, you are at reference level, i.e. Originally posted by Xevion:Yeah, IIRC it's 105db. IOW, 0 dB on that reciever may correspond not be same value on your reciever.Without knowing the actual reference point of your reciver, it's impossible to say how loud/soft it actually is. Understand that the scale used by a THX-certified reciever and your particular unit may not be the same. (I haven't been over -25dB on the DVD source, and that's loud enough to annoy the neighbors. If so, that's quite loud, and I couldn't imagine listening to movies at that level. Originally posted by Lestat:85dB SPL? So if the reciever sets the minimum sound level at -85dB, then 85dB would be at 0? (Depending on the mix, it's easy to fatigue your ears at 85.) Ĩ5dB SPL? So if the reciever sets the minimum sound level at -85dB, then 85dB would be at 0? If so, that's quite loud, and I couldn't imagine listening to movies at that level. I've listened to my share of movies at that level, but generally enjoy them more at closer to 75dB SPL. THX Reference Level is 85dB SPL, and yes, certified receivers probably use that as their zero point. (The know doesn't have a point where it starts and ends, it turns indefinitely). Especially since most modern recievers have a "virtual volume-knob" that doesn't have a fixed reference point. ![]() I haven't needed more than -20dB so far (which is quite loud), but I was curious what the designated dB level meant. I tested, and it seems my AVR-635 will go to about +10dB, using a digital source generating no sound (So as to not annoy neighbours and blow stuff up). Others just pull a scale out of their ass. The speaker outputs on a receiver will go up to more like 25V.Lestat: many receivers will designate 0dB as the THX reference level, but even then it's only an approximation since speaker sensitivities obviously vary a lot. Originally posted by Richard Berg:Nope - that's the scale for line level, which tops out at +4dBu.
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