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Thread: Amp Clipping/Only Rear from Soundcard

  1. #1
    FLAC Dougw133's Avatar
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    Amp Clipping/Only Rear from Soundcard

    ok...I have a CARPC using an older Soundblaster Live 5.1 Card with the KX drivers. The card works great, the SQ is great, and I haven't had any PC related pronlems. I have the Sound Card going into a rockford fosgate 3sixty.1 and then to my amps, then to 4 sets of Compnents (POLK). If I try to match the Db or output to the rear spweakers as I have for the front, the amp cuts out for all 4 speakers. I have tried the setup without the 3sixty.1 involved and same result. I can crank the fronts until my ears bleed. But for as high as i can bring up the rear speakers until they clip/cut the amp, I might as well not even have rear speakers. Any ideas? Too much power from the sound card for the amp to handle? Why only the rear? Does my amp just suck?> It is a 4 channel Pioneer GM-6300F with all the Ohms and power outputs correct for the Componets (Polk DB) I am using. Any ideas?? Thanks....

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    FLAC Dougw133's Avatar
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    Update...I was driving out tonight, and messing with settings...For a good period of time, It didn't even clip/ cut out...?? I cranked the rears! Then upon reboot the next time it was back to square on...I do not get it...

  3. #3
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    What happens when you switch the signal lines between the fronts<->rears? Either before the 3sixty.1 or before the amps.
    "In the beginners mind there are many possibilities, but in the experts mind there are few."- Shunryu Suzuki
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  4. #4
    Constant Bitrate
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    Since you got it to work at least once without any issues, then your more then likely looking at either a bad technical connection (wire, ground, etc.) or a setting that you changed.

    What did you change when you were "messing with settings"? Did you find one that works ok, then if you change it then it goes to not working?

    MY GUESS.. would be something to do with the wiring. Try what pancit175 said and swap the wires you are using from the fronts to the rears. If that fixes the issue, then you had a bad connection somewhere. Bad adapter, pinched cable, something not screwed/attached correctly or tightly, etc. Follow all the wires you are using, all the way from the PC to the speakers. Try also making it the shortest/simplist connection possible, just for troubleshooting.

    Try hooking the rear wires up the front speakers and see if you have the same problem. If that works fine, then you may have a blown speaker or a speaker wired in reverse.

    Best advice I can give is to play around with the wiring, finding out exactly what works and doesn't. Make notes, eliminate as much as you can as a solution and go from there.

  5. #5
    FLAC Dougw133's Avatar
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    I have tried the swap and nothing helped..What I was doing is lowering the db in the KX Driver Setting...So it will all work, but the rears are about half the output than the fronts. The voltages coming from the souncard are all the same..I am thinking it could be the amp. I have a capacitor and the voltage stays around 13.5 to 14V. Like I said, I can crank the fronts like a madman but...The 4 components, front and rear are all identical Polk MM6500. I know the ground is good. So, I guess it will take a lot more trouble shooting...Thanks...

  6. #6
    FLAC Dougw133's Avatar
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    Nothing has worked... It's definately to do with only the rear output from the soundcard. If I switch the rear output to the front input for the AMP it clips it. But the voltages seem to be very close on both sets of RCA's? I don't get it. Anyone have Sound Blaster Live PCI running to an amp?? Any problems?

  7. #7
    FLAC Dougw133's Avatar
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    Ok... I am seeing my amp has a S/N ratio of 95db. The card is rated at 96db..Would that matter? Now when it "clips/cuts out" I can still here music very faintly. It does not go into any kind of protect mode or power off/blink. The voltage to the amp remains steady. I feel as if I am throwing off the ohms or conflicting something here. It says the input voltages are as follows. 0.8 - 26V, 0.2 - 6.5V . I assume the first set is for 2 Channel mode, and the second for 4 channel?

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    thats strange. i had cutting out on my speakers when i had a pinched. cable that was shorting. try resetting your kx dsp back to default and see what happens. also check your volume in winamp as well as your individual wave and master volumes. if i turn my winamp and wave volume both up, i get clipping. try keeping your winamp volume real low, around 15% and see what happens. also check the gains on your amp.

  9. #9
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    If you switched the front and rear inputs to the amp and the rear outputs going to the fronts becomes louder to the point that it distorts then I'd guess that something is wrong with the amp.
    "In the beginners mind there are many possibilities, but in the experts mind there are few."- Shunryu Suzuki
    "Do it right or don't do it at all"

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  10. #10
    Constant Bitrate ronjon228's Avatar
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    This may be related to the output on the sound card. The factory front outputs on the SB Live 512 cards is known to have an inferior output DAC compared to the other outputs. I would try using your factory rear output, and the headphone output. Make sure to turn on headphone/center sub swap AND front/rear swap on in your Kx mixer. Then use the first and the last plug for your outputs. If you need help, let me know. I can send you some screen shots of my DSP and mixer setup. I'm using this setup now and it sound crisp and clean.
    CarPC:
    1.8GHz Northwood, Intel 845 Mobo, 512MB DDR, 1x20GB + 1x160GB, Intel GPU, SB Live 5.1

    Sound System:
    Phoenix Gold RSD 65cs 6.5" Drivers, Infinity Tweets, Pioneer 305DVC 12", PPI Sedona 630IX, Alpine MRP-M500

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