when i bought a centre speaker i assumed hearing voices would be a lot easier than without it and only using bookshelves, when i was playing films through laptop plugged in to my denon rcd-n8 for the sound i had to continiously change the volume but now even with proper home cinema i still have to adjust it maybe once or twice during the film
maybe its because the centre speaker is a bit low down as its level with my knees on the av desk (cant get it any higher im afraid) maybe its the sound mode of my av receiver (sony str-dn1040 currently set to HD-DSC (dynamic) previously had theatre or it could be something else. but i went through the options and i get my centre speaker to +10db and now the voices appeared to be a bit more louder
now that i +10 db the centre lots of other noises seem much louder..train crash from super 8 was so loud i had to turn it down..
unlikely but when i setup my av receiver and did the auto calibration i tried it about 5 times and all 5 times it had an error after playing saying the environment was too noisy and for me to do it when quiter..and there was no noise anywhere except the speakers!