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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: CD's&felt pens/Auric IIluminator posted by smuttner on August 14, 2003 at 21:39:02:
The CD laser emits light in the higher upper red wavelengths and the laser reading diode that recovers data from the CD is sensitive to red light. The turntable/holdown mechanisms of most CD players leave a lot to be desired i.e. they support a very small portion of the disc. Slight eccentricity in the exact centering of the center hole of the CD and differences in mass of the CD itself tend to induce both eccentric rotation and wobble as the disc spins. Also, these eccentricities prevent the disc from revolving in a perfectly parallel plane to the laser and laser reading diode. It is a principle of physics that the angle of incidence of light rays is equal to the angle of their reflection. In other words, the incidence of the laser light ray entering a wobbling disc causes myriad rays to be reflected within the disc causing scatter and reflections in all directions. As these reflected rays reach the edge of the CD they are reflected back toward the center of the disc so that the laser reader receives a plethora of secondary reflections which leads to smearaing and mis-reading of the original laser beam. Even tho these are comparatively weak they have an audible effect since they tend to slightly change the timing of the data. Some engineers are fond of stressing that as long as the 1's & 0's are all present in the propeer order the data is unchanged. This is true as far as the total data retrieved is concerned. However, music is especially sensitive to the TIMING of the musical notes i.e. as in wow and flutter in tape players and phonographs. Imagine several musicians in an orchestra playing their instruments slightly slower and others slightly faster than the rest of the orchestra and you get the picture.As to the effect of the Green marker : GREEN is the complimentary color of RED i.e. if you combine RED and GREEN BLACK is the result
which, in this case, nulls the reflected laser light that strikes the edge of the disc and would be reflected back to the laser reading diode. This results in better transition timing and greater clarity of sonics. I have found that coating the edges of a CD with BLACK marker further improves the sonics.Happy Listening !
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Follow Ups
- Re: CD's&felt pens/Auric IIluminator - pkell44 15:50:48 08/15/03 (1)
- color - monsterbill 16:16:18 08/15/03 (0)
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