D-E666

The D-E666 is a no-nonsense portable CD player from early 2001, aimed at listeners who wanted reliable everyday performance without stepping into the flagship tier. It ran on two AA batteries or Sony's slim NiMH gumsticks, delivered solid 1-bit DAC sound through a basic headphone output, and used G-Protection anti-skip that had by then become dependable instead of experimental. A simple remote is optional, and the body stayed compact and light enough for regular carry.

By this point, the category had already settled into a stable and predictable form. The D-E666 was part of the part of the line where restraint was deliberate, with the focus placed on battery life, consistency, and ease of use instead of expansion. It reflects the version of portable CD most people actually lived with.