Originally Posted by caloyzki
thank you jack, the problem is my player doenst have any preset settings,thats why i need to do it by me self all the tweaks from all the speakers.how usually it works, the front speakers suppose to be louder than the rear speakers?thanks
It really depends on the activity. Basically what you have with a 5.1 set up is 6 channels of audio (5 speakers and 1 subwoofer = 5.1). For content like movies encoded with 5.1 audio like Dolby Digitial, then the audio content will be split across the different channels, but not equally. Hence, dialogue will come out of your center channel while ambient sounds (wind through the trees, car horns, traffic, etc.) will come out of the other channels. Even those ambient sources may be at different levels depending on the sounds relation to the camera.
What you are trying to do with your system is to optimize it based upon your seating position(s). Therefore, seat distance to each speaker determines the output level you might want to set for each channel. The closer the seat to a given speaker, the "louder" the audio source will sound from that speaker. So think of this in terms of watching a movie...you probably don't want ambient sounds drowning out the dialogue so that you can't hear what people are saying. However, you still want to hear that ambient sound in the backround as that adds a lot of flavor to the experience and helps draw the viewer in.
Now, if you wanted all the ambient sources to have the same level of volume and you were sitting an equal distance from all the speakers, then you would set them at the same level. However, that is probably not what your seating arrangement looks like. Therefore, you need to adjust the output levels based upon your seating. If you are seated farther from the front speakers than the rear, you might boost the front a little and dim the rear so that they might have the same relative value to the ear.
For music though, this is typically 2 channel content and therefore many audio purists will dim all but the L/R channels as that will produce the most acurate playback of the 2 channel content. However, as Calcvictim points out, your system may offer a mode to "mirror" L/R content on all speakers equally. This would push audio out all the speakers at the same level. Some people prefer that all speakers play at the same level when listening to music while others only want L/R channel.
Keep in mind, even each seating position will hear the audio slightly differently. On mainstream and higher end AVRs, they have a auto tuning function that uses a microphone and some test patterns to generate tones that the mic hears and then the system adjusts based upon distance to the speaker. However, I don't think most prepackaged 5.1 systems offer this functionality. Therefore, this may require just some trial/error to adjust it to your liking.
So as you can see, it is a very subjective topic and you should optimize it to what sounds best to you. There really is no right/wrong setting here, only general guidelines. If it sounds good to you, then that is what really matters in the end.