Many CD players will be able to produce a 0dBfs signal with no clipping at full volume (or one step down from full volume) with their tone controls set to their 'flat' position (in the middle of their range - no boost or cut). Most of those players will produce a clipped output (when set at or very near maximum volume) if a 0dBfs track is played in a band of frequencies that are boosted by the tone controls (i.e. an 80hz 0dBfs track) and the tone controls (the bass control in this instance) are set for even 'minimal' boost (especially 2 volt preamp output models). Some decks will produce a clean signal no matter what the tone settings. Now, this doesn't necessarily make one deck better than another but you need to know how your deck performs. If you have access to an oscilloscope, you can check the output signal at the RCA jacks. Play a 0dBfs test tone between 40 and 100hz with the volume and bass at their maximum settings. Take note of the peak voltage (from the reference to the top of the waveform). You can multiply the peak voltage by 0.707 to get the RMS output voltage. Check to see where it clips (the volume control's position) with the tone controls set flat.