Sony Yeds18 Test: Disc Exclusive !!better!!

Sony’s high-end ES players use a precise laser diode. The YEDS-18 was pressed with a specific aluminum reflectivity (± 2%) that mirrors the exact density of a commercial CD. Burned CDs (CD-R) use organic dye with variable reflectivity (often 15-20% lower). When you insert a burned copy, the Sony servo mechanism misreads the "Focus Error" signals, rendering the calibration useless.

: Its optical quality allows technicians to view a perfectly defined "RF eye pattern" on an oscilloscope, something a standard or home-burned CD cannot replicate due to blurry signal output. sony yeds18 test disc exclusive