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  • carputer on board soundcard

    Hi eceryone, I did a little searching before posting this but couldnt find the answer. i just finished building a carpc and am using the intel atom D525MW motherboard with onboard sound card. this is installed in my 99 mercedes with factory bose amp. i used an PAC OEM 2 in reverse maner in order to have RCA plug ins to the speaker wires. everything works great except my base and volume are very low! so i was trying to find a solution for this and came up with a few things.

    1. run a headunit which i dont have the room for so out of the question.

    2. run an amp right out of the car pc into the pac oem 2 and then into the factory amp. i looked into a few cheapy amps because space is an issue for me and found a couple that are 300watts 4 channel. but is a 300 wat 4 chanel enough?

    3. run a soundcard which i heard of the name sound blaster. i'm not sure about this option can someone elaborate on this a little more.

    keep in mind im running factory speakers so i'm not looking for anything crazy just factory sound quality. Thank you very much in advanced.
    3.

  • #2
    im confused on your wiring. i think what you're doing is taking your soundcard as if it's a speaker level output, inputing it into the pac oem2 and getting line level output... hooking that up to the amp? if that is the case then the pac oem2 isn't needed. your soundcard outputs line level so you should be able to just wire that directly to the amp.... but it's bose.... hmmm something isnt adding up
    New System in progress:
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    Phaze TD1500 ~> Dynaudio MD130
    Phaze TD1500 ~> Seas g18rnx/p
    Zapco Ref 500.1 ~ 12" tc-9
    Behringer DCX2496 ~ Envision Electronics psu
    Transflective Xenarc

    My Car Pc Install
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    • #3
      Scott is right, you shouldn't need to use a LOC at all. By using the LOC, you are reducing the signal voltage going into the factory amp because they are designed to take a high level signal and attenuate it to a low level signal that amp can take in. The computer soundcard is considered a low level signal, and the amp takes in a low level signal. make sense?
      System always under construction


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      • #4
        I concur with durwood. 3.5mm jack to RCA cable to the factory amp. Your Line Output Converter (LOC) is doing exactly what it is designed to do, but you don't need it.

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        • #5
          Thank you very much too all the friends for your responces, that makes perfect sense. I think this is what i am going to do. eliminate the pac oem 2 and plug in the rca,s coming out of the car pc into a 300wat 4 chanel mini amp and then connect that amp to the bose amp via the factory wiring and i think i will have myself a winner. here is the last question:

          is the 300 wat 4 chanel amp enough? and is there a super small amp that you guys recomend?

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          • #6
            you dont need the extra amp. you go from your soundcard into the bose amp.
            New System in progress:
            M10k
            Phaze TD1500 ~> Dynaudio MD130
            Phaze TD1500 ~> Seas g18rnx/p
            Zapco Ref 500.1 ~ 12" tc-9
            Behringer DCX2496 ~ Envision Electronics psu
            Transflective Xenarc

            My Car Pc Install
            My Boat Pc worklog

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            • #7
              areyousure, because this is my factory bose amp not a high powered aftermarket amp. while i had mt stereo out of my car i was using my ipod to listen to music and i had it hookedup to the bose amp directly without the pac oem 2 and the volume and base very super low, but i'm not sure fi that would be the case with the car pc as well i dont know if the onboard sound card is much stronger than the ipod or not.

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              • #8
                what you're describing to do is go in a circle. if anything; possibly you need an inexpensive line driver.
                New System in progress:
                M10k
                Phaze TD1500 ~> Dynaudio MD130
                Phaze TD1500 ~> Seas g18rnx/p
                Zapco Ref 500.1 ~ 12" tc-9
                Behringer DCX2496 ~ Envision Electronics psu
                Transflective Xenarc

                My Car Pc Install
                My Boat Pc worklog

                Comment


                • #9
                  whats a line driver?

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                  • #10
                    think of it as an amplifier for you rca's

                    ---------- Post added at 09:40 AM ---------- Previous post was at 09:39 AM ----------

                    http://www.google.com/products/catal...d=0CFkQ8wIwAQ#
                    New System in progress:
                    M10k
                    Phaze TD1500 ~> Dynaudio MD130
                    Phaze TD1500 ~> Seas g18rnx/p
                    Zapco Ref 500.1 ~ 12" tc-9
                    Behringer DCX2496 ~ Envision Electronics psu
                    Transflective Xenarc

                    My Car Pc Install
                    My Boat Pc worklog

                    Comment


                    • #11
                      thank you very much for all your help scott, now one last question shouldnt i get a 4 channel pre amp? because the way my factory system is setup is as follows:

                      two twitters on the top of the front doors
                      two small speakers bottom front of the front doors
                      two larger speakers bottom rear of the front doors
                      two large speakers or as the factory refers to it as the woofers on the rear decklid

                      all though i have all those speakers i only have 4 pairs of speaker wire which i'm assuming two pair is for the rear decklid woofers and the other two pairs are for the front ones, which each door that has 3 speakers is running off of one pair of speaker wires but somehow beyond my knowledeg the signal gets dividede between the 3 speakers on each door. which i think they may be using the 3 way system but with all speakers seperated instead of all in one. so for that setup what setting do you recomend, because my mother board's onboard sound card has a 5.1 channel and when i plug in the rca to 3.5mm convertors into the back of the motherboard my sround sound set up comes up. the mother board model is intel D525MW.

                      Thanks alot for all your help scott.

                      Comment


                      • #12
                        Why don't you just replace the factory amp with an aftermarket amp that has a remote level control, or an adjustable input gain (almost every amp has this).. Running an amplifier into another amplifier will cause voltage issues and likely extreme noise. Your 300 watt amp (75x4) is MORE than enough on its own to run the speakers in your car. Get the factory amp out of the system and you will be much happier.

                        ---------- Post added at 10:46 AM ---------- Previous post was at 10:45 AM ----------

                        PM me the exact year and model of your car and an email address and I'll send you a wiring diagram for your factory stereo system, if you don't have one already from google.
                        Old School MP3CAR.com member!

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                        • #13
                          Originally posted by dscustoms View Post
                          Why don't you just replace the factory amp with an aftermarket amp that has a remote level control, or an adjustable input gain (almost every amp has this).. Running an amplifier into another amplifier will cause voltage issues and likely extreme noise. Your 300 watt amp (75x4) is MORE than enough on its own to run the speakers in your car. Get the factory amp out of the system and you will be much happier.

                          ---------- Post added at 10:46 AM ---------- Previous post was at 10:45 AM ----------

                          PM me the exact year and model of your car and an email address and I'll send you a wiring diagram for your factory stereo system, if you don't have one already from google.
                          i really dont want to change anything as far as my factory parts go. but thank you for the idea.

                          Comment


                          • #14
                            Originally posted by vipclk320 View Post
                            thank you very much for all your help scott, now one last question shouldnt i get a 4 channel pre amp? because the way my factory system is setup is as follows:

                            two twitters on the top of the front doors
                            two small speakers bottom front of the front doors
                            two larger speakers bottom rear of the front doors
                            two large speakers or as the factory refers to it as the woofers on the rear decklid

                            all though i have all those speakers i only have 4 pairs of speaker wire which i'm assuming two pair is for the rear decklid woofers and the other two pairs are for the front ones, which each door that has 3 speakers is running off of one pair of speaker wires but somehow beyond my knowledeg the signal gets dividede between the 3 speakers on each door. which i think they may be using the 3 way system but with all speakers seperated instead of all in one. so for that setup what setting do you recomend, because my mother board's onboard sound card has a 5.1 channel and when i plug in the rca to 3.5mm convertors into the back of the motherboard my sround sound set up comes up. the mother board model is intel D525MW.

                            Thanks alot for all your help scott.
                            it sounds as though you have some sort of processing going on after the amp. a passive crossover. if you have 4 sets of wires going into the amp then you'd want a 4 chan preamp. this is assuming that all of your speakers are being driven soley by that amp.

                            Originally posted by dscustoms View Post
                            Why don't you just replace the factory amp with an aftermarket amp that has a remote level control, or an adjustable input gain (almost every amp has this).. Running an amplifier into another amplifier will cause voltage issues and likely extreme noise. Your 300 watt amp (75x4) is MORE than enough on its own to run the speakers in your car. Get the factory amp out of the system and you will be much happier.

                            ---------- Post added at 10:46 AM ---------- Previous post was at 10:45 AM ----------

                            PM me the exact year and model of your car and an email address and I'll send you a wiring diagram for your factory stereo system, if you don't have one already from google.
                            if he has bose he is more then likely dealing with 2 ohm or lower speakers. i think it'd be less of a pain to just integrate into the bose amps then to replace them
                            New System in progress:
                            M10k
                            Phaze TD1500 ~> Dynaudio MD130
                            Phaze TD1500 ~> Seas g18rnx/p
                            Zapco Ref 500.1 ~ 12" tc-9
                            Behringer DCX2496 ~ Envision Electronics psu
                            Transflective Xenarc

                            My Car Pc Install
                            My Boat Pc worklog

                            Comment


                            • #15
                              This is a case where maybe you would use a line driver since the OEM amp has no ability to adjust the input sensitivity. I would try without before buying first. If your carpc cannot reach the same volume as your OEM radio, then you would need one. I think the HD audio spec indicates a stronger signal than an IPOD, maybe 10x the output voltage so you might not need one. The question regarding 2 channel or 4 channel bose amp input connection can be answered easily since you tested this with an IPOD already, did 2 channel connection result in sound from all the speakers?
                              System always under construction


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