CD players and transports under $5,000 range from refined single-box players to separates-grade units with isolated DAC and transport sections. At this price, clocking gets more precise, power supplies get their own regulation per stage, and analog output sections use discrete circuitry instead of op-amps. If you've got hundreds or thousands of CDs, a player at this level extracts detail and dynamics from silver discs that streaming rarely matches, especially on older masterings that predate the loudness wars. There's a reason serious collectors keep spinning discs.