Working fine. Sold as is. Super heavy. No remote. Super Rare.

The Yamaha CDX-1100 is the first player to achieve the performance of 18-bit digital decoding from a 16-bit digital-to-analog (d/a) converter. In addition, it provides almost every operating convenience currently available in a CD player.

The CDX-1100 uses 18-bit quadruple-oversampling digital filters for each channel. The 176.4-kHz sampling rate of the filters greatly reduces noise in and just above the audio range compared with nonoversampling, 44.1-kHz filters. Since the spurious products and noise created by the digital sampling process are far above the 20-kHz upper frequency limit of the CD system, they can be removed by a digital filter, in conjunction with a fifth-order active analog filter, that has a relatively gradual slope and a high cutoff frequency. These characteristics help preserve a flat response and produce less phase shift and ripple within the audio range. Compared with 44.1-kHz sampling, quadruple oversampling gives a fourfold improvement in time-axis resolution, although this is normally beneficial only at the higher program levels. Yamaha's 18-bit filters extend this improvement to the low-level portions of the program, where they also provide a fourfold improvement in amplitude resolution and correspondingly lower distortion.

The peak levels on a digital disc rarely reach the two highest, or most significant, bits of a 16-bit system, so the full capability even of 16-bit d/a conversion is needed relatively infrequently. Many CD players, in fact, use 14-bit decoders without a significant loss of quality. Nevertheless, distortion increases rapidly as the program level decreases, and it is concentrated in the less significant bits of the digitally encoded signal. In fact, a pure sine-wave signal represented by the least significant bit is actually decoded into a square wave with a very high percentage of harmonic distortion, although it is not likely to be audible as such because of its very low level and masking by the other program material.