Don't worry about getting "flat" in-room response. This is what makes audiophiles wear tinfoil hats and wait for "them" to come.
The numbers in the on-screen display of your Yamaha are relative volume levels. THe numbers themselves mean nothing. Your turning them all up about equaly simply means that you don't have to turn the main volume up as high to acheive the same volume level. The ideal is to simply have all of your speakers playing at the same volume level when you run the receivers test tone. That way when you are listening to multi channel recordings you hear the whiz-bang effects at the volume level the recording engenier intended.
The SPL meter will get you close to the right relative volume levels. From there close your eyes and adjust according to what YOU hear. If your rear right speaker sounds muted turn it up. You will be listening to the sound coming from your speakrs... not your SPL meter.
Good luck!
The numbers in the on-screen display of your Yamaha are relative volume levels. THe numbers themselves mean nothing. Your turning them all up about equaly simply means that you don't have to turn the main volume up as high to acheive the same volume level. The ideal is to simply have all of your speakers playing at the same volume level when you run the receivers test tone. That way when you are listening to multi channel recordings you hear the whiz-bang effects at the volume level the recording engenier intended.
The SPL meter will get you close to the right relative volume levels. From there close your eyes and adjust according to what YOU hear. If your rear right speaker sounds muted turn it up. You will be listening to the sound coming from your speakrs... not your SPL meter.
Good luck!