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  • e46 M3 audio issue...

    Guys i removed my head-unit yesterday, hooked up the pc and everything is working except my audio is a little low.

    This is my setup right now...

    From Stock Metra harness to metra harness from best buy for aftermarket cd players. From that to sven4 from sven4 to PC's sound card. Sven4 is turned all the way up on those knobs and it goes from wired to rca output.

    Any way to amplify this sound a little more... I mean it sound low and it's like there is no bass at all...

    did I mess anything up or is this what i should have expected?

    Thank you very much.

  • #2
    are you using a factory amp or does the signal go straight to the speakers?
    My OLD 2001 Mitsubishi Eclipse GT:
    "The Project That Never Ended, until it did"


    next project? subaru brz
    carpc undecided

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    • #3
      I'm using factory amp... I've done some searching and it looks like i may need some line drivers... Is that all I need to put it in line from laptop to sven4?

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      • #4
        the sevn4 is only a line out converter, it converts high level (speaker level) to low level(rca level), but i cannot be sure if it converts it the other way--rca level to speaker level(i can't find anything for, or against this).

        here is one of the most vague threads i was trying to read, that had a similar problem:
        http://www.mp3car.com/vbulletin/car-...ose-sven4.html.

        you will first need to find out if the factory amp is expecting speaker level or rca level inputs (or someone with more E46 experience) but i am not completly convinced that you need the sven4.

        if the amp is expecting speaker level voltage, it would be easiest to replace the amp with a aftermarket amp (otherwise you would end up adding a amp before the factory amp to boost the signal, and that is just too much redundancy, and is only going to add problems).

        if the amp is expecting a rca level signal, than the line driver would be what you need.

        but again, i have no idea what the sevn4, or the factory amp are doing, so you will ned to determine that first.
        My OLD 2001 Mitsubishi Eclipse GT:
        "The Project That Never Ended, until it did"


        next project? subaru brz
        carpc undecided

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        • #5
          After searching and searching mainly about e46 it seems that everyone has put a line driver between pc and sven4. That helped... now my problem is getting one of those in town...

          do you, or anyone else knows of any good line drivers that aren't too expensive? Does Best buy or any other store sell those locally? I assume i would need a 4 channel one.

          Thanks a lot.

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          • #6
            best buy no longer has much more than aftermarket radio mounting kits...
            there are a bunch of different products that should do what you need, some of these, you will need to order 2 of them though:

            http://www.sonicelectronix.com/item_...ix+-GRAY-.html

            http://www.autotoys.com/x/home.php?cat=455
            My OLD 2001 Mitsubishi Eclipse GT:
            "The Project That Never Ended, until it did"


            next project? subaru brz
            carpc undecided

            Comment


            • #7
              It doesn't make much sense to me to have a Sven4 and then buy another LOC to reverse the operation... The Sven4 will work both ways RCA to speaker and speaker to RCA.

              If your BMW is like mine, the factory amp needs speaker lvl signal. Also, you are describing your sound route backwards. Start from the laptop and up.
              Laptop is line, then Sven4 for line-to-speaker, then hook it up with your default harness via an adapter or soldering. Your factory amp would be now receiving the correct signal.

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              • #8
                That is how it's connected... mini to rca, Sven4 to harness. harness to amp. It's just low... not as powerfull like with the headunit. That's all.

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                • #9
                  Originally posted by MrZ View Post
                  It doesn't make much sense to me to have a Sven4 and then buy another LOC to reverse the operation... The Sven4 will work both ways RCA to speaker and speaker to RCA.

                  If your BMW is like mine, the factory amp needs speaker lvl signal. Also, you are describing your sound route backwards. Start from the laptop and up.
                  Laptop is line, then Sven4 for line-to-speaker, then hook it up with your default harness via an adapter or soldering. Your factory amp would be now receiving the correct signal.
                  thanks for clearing that up (any info i could find was very vague on the sevn4-- and i couldn't be sure f the amp configuration)


                  boostin-- you could try placing a line driver before the sevn4 to see if it would help, but being that the factory amp is expecting a speaker level signal, you might be better off replacing it with a aftermarket amp that can better use a rca/line level signal. (after the cost of the sevn4 and the line drivers, you will probably end up being very near the cost of a different amp anyways)
                  My OLD 2001 Mitsubishi Eclipse GT:
                  "The Project That Never Ended, until it did"


                  next project? subaru brz
                  carpc undecided

                  Comment


                  • #10
                    Yeah, believe it or not, that's what i was thinking too... Everyone that removed the head unit in the e46 and did it like me, said they had to put line driver in, but then again it wasn't as good as with the head unit.

                    So i decided i'm just going to plug the head unit back in, relocate it to the glovebox and use the aux on it for the audio of the pc.

                    Last night i plugged the headunit in just to test it out and it sounded awsome.
                    I don't want to have all this extra stuff when relocating headunit will be easier.

                    Thanks guys.

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                    • #11
                      I used an X-tronic USB Amp instead of the HU. Right now at max level I'd chew the speakers, so it's as loud as with the HU.

                      My setup: Comp -> Xtronic USB DAC Amp by USB -> car audio.

                      I've set a 31-Band EQ by using some software and I'm all set with that.

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                      • #12
                        so you have that amp and then the stock hk amp as well? Did you use sven4 at all? how did you integrate from the usb amp to the metra harness?

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                        • #13
                          I have the HK, yes. No Sven4 involved, just the Xtronic USB DAC Amp.

                          The USB Amp has got a Molex style connector for the speakers, 12v Acc in and 12v out lines. You can use any adaptor that fits your car harness and cut the other end, then pair the cables with the USB Amp molex as if it was the HU.

                          That way the HK amp receives more or less the same power and signal it did with factory settings. USB Amp is a 4x40 unit, pretty much the same as the HU.

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                          • #14
                            why pay for all that I have a e46 M3 setup with a carputer and my volume was low. I ended up getting a Auzentech Forte 7.1 X-FI sound card. It increased my volumes by 200% and the sound is next to amazing. I had used onboard and also usb sound cards before this and sound volume at 100% sounded like it was at 50%.

                            PM me if you need more help or tips. I am also using a HK stock amp with my system (no way to control the stock amps volume without head unit).

                            ** as for bass well the HK stocks speakers actually isnt the best and sucks at bass. what I did do which was very easy was I added a amp and sub in my trunk hooked it up to my Auzentech 7.1 soundcard to the center\sub channel. So my 4 stock front speakers is still connected by factory amp and I added a extra amp\sub. Now my sound has very good bass. The biggest trick for best sound is to set my speakers to 4.1 configuration and the X-FI software.

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                            • #15
                              Originally posted by potpeye View Post
                              why pay for all that I have a e46 M3 setup with a carputer and my volume was low. I ended up getting a Auzentech Forte 7.1 X-FI sound card.
                              So you wouldn't pay for a external USB DAC Amp (which is basically an external soundcard with Digital Audio Converter and 4x40 Amp) and would pay for a INternal sound card?

                              It's the same as saying I wouldn't buy a red apple but a green apple.

                              As for sound, I'm using a VST Host to run realtime VST plugins. You can basically add whatever you need: crossovers, filters, EQ, Dinamizers, compressors, noise gates...

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