Can you explain what the reference DBv is of the amp in put at 0 DB referance. How can you use Ref. The THX 0 dB value is relative to the calibrated pink noise 85 dBC SPL value. Loudness Plus automatically and seamlessly compensates for the tonal and spatial shifts that occur when the volume level is reduced. Hello DUde. Loudness Plus automatically and seamlessly compensates for the tonal and spatial shifts that occur when the volume level … Please click the "I Accept" button. Movies are presented and played back in cinema and home theaters. The 0 dB (decibel) setting represents an average 85 dB SPL (sound pressure level). THX Certified Audio products are designed to let you experience movies the way they were meant to be heard. It depends on the efficiency of your speakers, the size of your room, the room's acoustic damping coefficient, and other things. Not necesarily regarding THX, just in general. I have a Pioneer SC-35 which is THX-II certified but that doesn't mean anything if my speakers arent. The Yamaha's YPAO should calibrate to reference level (note the volume control setting it uses). Your amplifier's gain value is arbitrary and it is just a means to achieve the THX SPL reference level. Delivers rich high-fidelity audio experiences in the car or home at any listening level, Uses multi-channel spectral balancing to adjust the level and frequency response to counter the perceived loss of low and high frequencies at lower volumes, Surround sound channel processing preserves the spatial detail lost as you lower the volume, Automatically shapes the output on surround channels to maintain the perceived balance in the original mix. The THX 0 dB reference level is a calibrated volume setting used in dubbing, cinema, and home theaters. I been researching this also and you did shed a lot of light on it. Everyone's setup is different and this is the whole reason for calibration. Please click the "I Accept" button. On every THX Certified AV Receiver the “0” on the volume dial represents THX Reference Level, the exact volume level used by the moviemakers and sound artists in the studio. By increasing the levels of the ambient sound, you experience the true high-fidelity audio of movies, music and games at any volume. I guess the problem is why directors/sound engineers choose such high levels that the standard can't be followed. Thank you!!! Reference level is a calibrated volume setting used for both movie production (in dubbing stages and post production houses) and reproduction (in screening rooms and theaters). I know my amp output is not 1 DBv. From what I read it is 1 watt. Great blog topic, Cheers. THX.com uses cookies to provide and improve our services. What is ‘THX Reference Level’? Hello The DUde. The power or voltage out of your amplifier required to achieve the THX 0 dB reference level is not a fixed value. It is sad that specs are not followed by the theatres. This is assuming you use the little YPAO cal mike that came with the AVR. IIRC my RX-V2500 uses a -10 setting for its reference level calibration. Achieving the THX Reference Level is no simple task for receivers or loudspeakers. THX Certified Audio products are designed to let you experience movies the way they were meant to be heard. By using our site, you consent to cookies. Movie soundtracks are created and mixed in dubbing theaters. To ensure the audio products reach this peak performance THX developed a set of standards as part of its THX Dominus, THX Ultra, THX Select, and Integrated System certifications. Thanks so much EricEverthing I have read said it is relative, but not what is was relative to.obviously not all recordings (music or movies) are the same, because I listen to (music especially) above 0dB (out from amp)Thanks again. Some receivers calibrate "reference level" to be the 0 dB setting on the master volume control, and others do not do so. I too wanted to know what the reference level equated to and how that applys to home theater equipment. Although THX sets the reference level to 85 dB SPL, but should the movie producers also mix sounds close to that level? -15db for movies are pretty much the standard, only with some older cd mixes do I get close to -5db. When I see 0 dB on my screen from the out put of my amp, what is the 0 dB relative to? DB to figure out power out of your amp, where a 3 DB increase is double the power. Reference level is set by adjusting the gain of the audio amplifier(s) so that, when the amplifier level scale reads “0 dB”, an electrical level of 20 dB below maximum digital level (-20 dB FS) produces a sound pressure level of 85 dB SPL at the listening position. I was looking on the net to find the reference level for my home theatre and this blog was very informative. It requires a tremendous amount of power to drive an audio system effortlessly without clipping or distorting. THX.com uses cookies to provide and improve our services. By using our site, you consent to cookies. When calibrated, -22 dB is the calibrated "reference level" setting on the master volume control. I guess what I am really having trouble with is the diffrence between absolute power (volume) and Relative (gain). My non THX receiver uses 0 dB on the master volume to indicate full volume, nothing higher in level.