A boombox style CD player really can't be described as best. CDs are still the best, most high fidelity format available, no matter what any misinformed hipster might say. The best ones are stand alone units that need to be plugged into some kind of amplifier. I personally prefer the players made bt Technics with MASH or California Audio Labs. They can be had for cheap on eBay or Facebook Marketplace because people stupidly think they are obsolete. If you don't want to go the full stereo system route, most of them have headphone jacks and with a good set of headphones (not Beats, Bose or any other kid crap-brands, the good brands are Fostex, AKG, Sennheiser, Beyer Dynamics) they will blow you away with the quality of the sound.