Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Poor quality

The audio quality is poor, some annoying background noise. Not sure why but it's clearly worse once I ripped them (digital and converting to 160kbps MP3s in iTunes). Now it's still clearly noticeable when playing from the CDs (using the computer).It's not only the audio quality that's poor, it's also clearly a low budget for the prodcution using only one female and one male voice even though the dialogues often have two female or male actors. A couple chinese teacher could probably spend a day or two producing the entire series using just two microphones and computer with CD burner. Amazing that this is supposed to be the most widely used text book in US.