Duomike, even with the best turntable, if there are problems in the design of the phono section, ticks and pops will be abundant! This can have nothing to do with the actual LP BTW.
Mapman, the birdies I am referring to can be heard by anybody when you employ a sweep tone to ferret them out. Here is someone who discovered this phenomena by accident:
http://www.diyaudio.com/forums/digital-source/34329-cd-frequency-sweep-can-hear-birdies.html
It seems that the slower the sweep, the easier they are to hear. Now consider that this sort of thing (in-harmonic distortion) is going on all the time within the context of music during playback. The ear will interpret this as a brightness, even though some of the 'birdies' content can be low frequency.
To be more precise, the birdie tone is a non-linear manifestation of intermodulation between the scan frequency and the actual tone. As the tone changes frequency, so does the birdie tone. It is caused by poor dithering technique, poor monotonicity in the DAC, and other inter-modulations in the conversion process. I'm pretty sure the industry could have avoided a good bit of this had they been paying attention, but the assumption was that if the digital system had super low THD that is was therefore free of distortion. They just simply didn't *look* for any other forms until much later...
Mapman, the birdies I am referring to can be heard by anybody when you employ a sweep tone to ferret them out. Here is someone who discovered this phenomena by accident:
http://www.diyaudio.com/forums/digital-source/34329-cd-frequency-sweep-can-hear-birdies.html
It seems that the slower the sweep, the easier they are to hear. Now consider that this sort of thing (in-harmonic distortion) is going on all the time within the context of music during playback. The ear will interpret this as a brightness, even though some of the 'birdies' content can be low frequency.
To be more precise, the birdie tone is a non-linear manifestation of intermodulation between the scan frequency and the actual tone. As the tone changes frequency, so does the birdie tone. It is caused by poor dithering technique, poor monotonicity in the DAC, and other inter-modulations in the conversion process. I'm pretty sure the industry could have avoided a good bit of this had they been paying attention, but the assumption was that if the digital system had super low THD that is was therefore free of distortion. They just simply didn't *look* for any other forms until much later...