About the problem of home surround sound system. For audio and music enthusiasts

Answer based on what I know.

Function key 1: SCAN: AC-3, DVD, CD, MP3

This should be determined according to the audio source being played. For example, the audio source of AC-3 is placed on AC-3. I guess the phenomenon you mentioned in your question is caused by the mismatch between the sound source and the selection of this function key.

Functional health 2: CH. M: 5.1 channel, 2.1 channel

Is this a choice between 5 speakers and a subwoofer (meaning 0.1), or 2 speakers (left and right speakers) and a subwoofer. You can choose 2.1 when pursuing high sound quality for CDs, etc., but generally 5.1 will suffice. "After switching to AC-3, this is displayed as invalid." I don't quite understand this. It may be that the AC-3 is fixed at 5.1 and cannot use 2.1 (maybe this is the product specification of this machine).

Function key 3: DSP (sound field): live, rock, disco, analog, matrix, hall, pop, classical, and off

This is to add to the sound Adjustment of upper treble and bass (i.e. equalizer effect) and echo. The only difference between all of these is the amount the highs and lows are boosted or reduced and the duration of the echo. If you are pursuing high sound quality, turn it off. The invalid AC-3 may also be due to the product specifications of this machine. It is more likely that these effects have been built into AC-3 and no additional effects are needed (essentially the same reason).

Function key 4: MENU: treble, bass, subwoofer, center, surround, right surround

I don’t understand your question. However, there is no such thing as good or bad audio, you can only like it or not. All for which there is no optimal ratio (if it exists, it is set by the manufacturer). Can be adjusted according to your own preferences.

Function key 5: HI-FI switch

Among audiophiles, they usually turn off all unnecessary things, including equalizers, displays, etc., in order to pursue the enjoyment of music. pure. Among audiophiles, using 5.1 (that is, left and right surround) to listen to high-fidelity music is a joke. At the same time, there is no 5.1 high-quality music source. So for these two reasons (turning off all unnecessary things and not listening to 5.1), it is easy to understand that the left and right surrounds are silent (that is, this product may intentionally turn off the left and right surrounds).

Finally, there is the problem of overlap between DTS effects and other sound effects. There will be no overlap. But whether it is necessary is another question. As I said just now, there is no good or bad sound system, you can only like it or not. Adjust it according to your own preference.