deteriorating sound problem
well, i run onboard out to a cable (headphone to rca) to my 5.1 channel surround, then from there to a 2 channel 100 watt system. pretty nice for onboard, except it seems like it isn't as good as it used to be. i think i have it slightly better, but i'm wondering if somehow my settings on my 5.1 got mixed up. what should DRC (dynamic range compression) be set to? i would assume that it does an mp3-like effect and strips certain acoustic areas, but i'm not sure. also, what should the SPDIF be set to? SPDIF OFF, SPDIF/RAW, SPDIF/PCM? and what about the LPCM (idk what it stands for). i have an option for 48k and 96k. i think is also somewhat like spdif but not sure. if it helps any, the cable from the 5.1 to the 2.0 is an rca-rca gold plated. When i have the 5.1 set to stereo mode, which it usually is because it only recieves 2 channels, should i have the Pro Logic ON, OFF, or MULTI? if i set it to off, i get an option for V. Surround, but if i turn on v. surr the sound fades somewhat. lastly, for speaker distance, does this mean from me to each speaker, or the length of cable from speaker to the system...? much appreciated if someone or some people can answer these questions!
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Secondly, Linear Pulse Code Modulation (LPCM) is a format that is a popular choice in the Music Production. It is an audio production technique that, without compressing the sound data, simultaneously samples and captures analog signals and transforms them into digital signals. This uncompressed digital audio is the same format as what is used for Music CDs (samples 44.1 kHz at 16 bits per sample). LPCM has been defined as a part of the DVD standard, but most average DVD players can only support 48KHz/16bit capability. Only relatively more expensive players have built 96kHz/24-bit capabilities. So I would choose 48K or 16-bit.
Next, You said 'When i have the 5.1 set to stereo mode, which it usually is because it only recieves 2 channels, should i have the Pro Logic ON, OFF, or MULTI?' That's because you can really only use 5.1 when using Dolby Digital. If the source was not encoded using Dolby Digital you use Pro Logic and a DSP (Digital Signal Processor) to simulate or create virtual surround sound. So if the source is not Dolby Digital, use Pro Logic.
Also the speaker distance is talking about the length of cable from speaker to the system AND distance from yourself to the speakers (should be relative, but not always, ie: you're four feet from the speakers but have a 50 ft. coil of cable connected). In which case there is usually a rear delay time setting that can be used to register the delay time of the sound from the rear speakers, comparing that of the front speakers in milliseconds. If the distance from your listening point to the rear speakers is equal to that of the front speakers the set to 0 msec. As the distance to the rear speakers decrease, increase the delay. Rule of thumb here is 30cm of distance = 1msec of delay. Hope that helps.