Originally Posted by coxjamb
Got a few things bothering me with my setup and need some help! My receiver is a Yamaha rx-v667. All inputs are receiving audio over hdmi.
Speakers are svs prime fronts and def tech pro monitor 1000 surrounds. Volume goes from like -80 to +16.
1)Not really a question but I guess I don't understand how my avr volume works. I ran YPAO and then used a spl meter to check that "0" was 75db using test tones from S&M test disc. 75db was actually at about -1.5 which I figured was due to the accuracy of the spl meter which is +-2.
So I figured I was good to go. Last night I was listening to music on apple tv using airplay from my mac. I pulled out the spl meter just to see how loud I listen to music. With the avr at -30 I was getting between 70-75db. How can this be? My guesses are:
a)Different inputs on the avr have different volumes relative to one another. If so, how do you fix that?
Adjust each input's Volume Trim. See page 52 of the US manual. A link to it is available on the Web page https://usa.yamaha.com/products/cont...sual&l=en&p=56
b)Music (pcm) plays louder than dolby digital or dts signals. I used dts hd ma signal on the S&M disc to check for 75db at (0). Maybe this is like how many sd channels on cable playing pcm(stereo) play louder at the same avr volume as most hd channels with DD audio.
The level difference between PCM and multichannel encodings of the same soundtrack has been present since forever. There have been various technical descriptions about why they're different, but it really just boils down to being "that's the way it is."
In contrast, the high volume level of CDs is the fault of their producers. See https://en.wikipedia.org/wiki/Loudness_war
The level differences on individual TV channels between program and advertisements is the fault of the advertisers. They set the their sound levels high. The FCC had to establish limits on how much they're allowed to increase the volume. You can use Adaptive DRC to compensate for this. See page 51 of the owner's manual.
c)Itunes and airplay do weird things with the volume. Songs that are actual Itunes downloads play louder a lot of the times than songs that are ripped from cd's. With sound check off on itunes most songs play at different volumes depending on whether they are itunes downloads,ripped cds, or hd tracks 24 bit 48hz songs. Doesn't airplay convert all songs to 48hz instead of 44.1?
The bitrate and bit depth have nothing whatsoever to do with the relative volume levels. The sound level variations are due to the level settings used by whoever created the download. Complain to them. Unlike with movies, there are no volume level standards for music.
I am guessing some combination of all three of is what has me baffled at the volume situation. This also leads me into my 2nd mystery. I listen to music on the apple tv with the avr in 2ch mode with svs prime bookshelves. They are pointed straight out and about 7 feet apart. I sit about 10 feet from them. I know from reading on here that these are not the most well regarded speakers for music but they sound like crap with music on the apple tv. They sound great on movie soundtracks, even ones with a lot of music such as frozen or moana. Yes, I have two small children. With the apple tv, they sound muddy and vocals get harsh on some songs. I am not talking about siblance with s's or t's but almost like an edginess. I am trying to figure out if this is due to the apple tv, the speakers being crap for music, or the fact that my avr is not very powerful and playing so loudly (75db) at such a low volume (-30) is making the reciever clip.
It's the poor quality of audio provided by AppleTV. See http://www.appledystopia.com/bad-app...audio-quality/
I have tried playing music on the apple tv and changing the parametric eq on the avr from (flat) to (natural) to (through) and got the same results. I have checked the audio settings on the apple tv but maybe I missed one or don't understand what a particular one means. My next experiment will be to take some music on a thumb drive and play it through my udp-203 and see what it does. This will at least tell me whether it is the apple tv or not.