David@FrankHarvey said:
The relative levels of the channels can have a huge effect on how the end result sounds, and although there is a right way to do it, much of the time a system is set to how the end user prefers, although sometimes individual channel trims are set to disguise system shortcomings. Those with an insufficient centre speaker will usually have it turned up higher than necessary because it isn't good enough to stand out against the rest of the channels.
Most peole shouldnt need to adjust a channel level any more than about +/-5dB, with the sub being the main one that can differ wildly - my subs are usually on around -8dB, but with higher gain at the sub itself to avoid any possible chance of overloading the input to the sub on louder scenes (although at normal volume levels, this shouldn't be an issue anyway). Anyone with their sub set between +5/10dB at the receiver/processor should system reset and start again and get that level down to no more than 0dB ideally.
I find, on all four of my systems, that the centre channels and the subwoofer are the ones that the receiver's automatic calibration systems struggle with and I have to adjust them. Usually the automatic system results in the centre channel being too weak and the subwoofer channel being too strong, so I have to turn the centre channel well up and the subwoofer level well down from the automatic suggested values.
For instance, in my parlour system, with my Denon AVR 4810 receiver, the Audyssey calibration suggests the centre channel at -5dB and the subwoofer at -1.5dB. I have the subwoofer (SVS PC13-Ultra - old style, with the 750W Bash amplifier) at -3.0dB, but the centre channel (a Kef Cresta 20c) at 6.0dB, which is 11dB more than the recommendation.
In my kitchen system as mentioned in post , these are the levels that I currently have
Most of the speakers are at the levels suggested by the YMPAO calibration, but I've had to increase the single rear back from -3.5dB to -0.5dB, and the centre channel from -3.5dB to +1.5dB.
My systems in my bedroom and the front bedroom are similar, the centre channel has to be boosted quite a bit from the values suggested by the calibration. Otherwise I just don't hear the voices in films clearly enough. I do the manual adjustments by using the receivers' test tones to make the sound from all speakers sound of equal loudness from the main listening position. And I don't have a smart phone, so I can't download any apps!