The media center has a calibaration tool. You can use it.
Or get a dvd that supports Dobley caliberation [its mentioned in the back cover.]
Most caliberating software cost 100$ or more and are horribly complex and professional. Case and point
this.
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To improve recording quality you can try to get an single stage ultra low Preamplifier/mixer. Make one or buy one from any radio store. [preferably make one. The cheap commercial ones sound flat and the good'uns cost...]
Dont try it on you output or you will burn your speakers.