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Turntable line-in issues

post #1 of 6
Thread Starter 
I just built a new comp for my brother but there seems to be issues with the line-in sound (his line out sound is perfect). My brother says his records sound distorted and are very low quality in comparison with his older comp.

I'm a noob with sound so if you could help me out that'd be great.

his mobo is a msi 870a-g54. newegg lists his audio chipset as being ALC892.

When I first built it, I forgot to install the audio drivers and he said there was no sound from line-in so I downloaded the ones off MSI.

The sound worked from there but he noticed crackles and distortion.

I've tried downloading high definition audio codecs off realtek, but it didn't change anything.

I've also tried fiddling with all the setting from record devices in volume controls like turning it up to the highest quality Hz and messing with levels, checking off listen to device, disabling enhancements but still nothing...


Any clues as to what is going on here?
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post #2 of 6
I'm somewhat suprised that your brother seems to only have an issue now. The reason I mention this, is that typically a "line level" input is looking for a signal at 1.0 Volt in order to perform as expected.

A typical turntable only outputs a signal at .01 Volts. Typically it is required to amplify and condition a turntable output up to "line level" (1 volt). Without the proper signal conditioning, the output of a turntable will sound thin and harsh. This is necessary for all turntables that don't specifically provide a built-in Line output.

In addition to needing this extra amplification, a turntable preamplifier (which can be an add-on box, or incorporated into a receiver or amplifier as a "Phono" input) must supply a precise amount of bass boost and treble cut. This equalization is called an inverse RIAA curve, named for the standard adopted by the RIAA and used with vinyl recordings for over 50 years. The equalization is necessary to counteract the physical limitations of the vinyl recording and playback medium. Turntables that have a built-in Line level output automatically provide the needed equalization.
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post #3 of 6
Thread Starter 

I think it has a internal preamplifier so it will work alright on line in. this is the turntable he has: Audio-technica AT-PL120.



http://www.audio-technica.com/cms/tu...97/index.html/

I don't see any equalizer do hickies on this turntable other than for pitch. Is that what you're talking about?
Edited by smartasien - 1/19/11 at 11:23am
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post #4 of 6
Thread Starter 
bump.

my brother also mentions something about stylus talk. anyone know how to correct it along with the line in distortion?
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post #5 of 6
Stylus crosstalk? If that's it then the cartridge needs to be properly aligned, and that might also be the source of the distortion. Having the tracking force set wrong can cause distortion as well.

Here's a how-to guide and protractor to print out for aligning the cartridge:

http://www.enjoythemusic.com/freestuff.htm

To set the tracking force, follow steps 3 & 4:

http://stereos.about.com/od/systemse...blesetup_3.htm
    
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post #6 of 6
You still need an attenuator to adjust the amplification coming in. That's why it's distorting. It's hitting the red on the incoming signal. How is he going in? Is he connecting the TT outs using a Y-Connector? I see it claims staright line-in application, but I'd be suspect on such a cheap TT. I also see there's no ground wire, which is essential to reduce noise.
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