No single best amplifier here. What decides it is what you have to drive, what you need to plug in, and how much of the system you want in one box.
| Area | Better | Why |
|---|
| Power | B | Mark Levinson No.5802 has more power - 125W against 100W into 8 ohms. That is about 1dB, which is a small step in loudness but real headroom on peaks. |
| Room size | depends | We rate Accuphase E-3000 the better fit for a small room, and Mark Levinson No.5802 for a large room and a very large room. Match the amplifier to the room you actually have, not the one you want. |
| Grip on hard loads | B | Mark Levinson No.5802 holds up better into a 4-ohm load: its output nearly doubles to 250W, where the other increases strongly. That matters with demanding speakers far more than the 8-ohm figure does. |
| Built-in DAC | B | Mark Levinson No.5802 has a DAC on board; the other needs an external one, which is another box, another power lead and another purchase. |
| Room to grow | A | Only Accuphase E-3000 offers a pre-out/main-in loop - which decides whether you can add a subwoofer or a power amplifier later without replacing the box. |
| Price | B | Mark Levinson No.5802 costs less - $8,500 against $9,500 at list. |
| Watts per dollar | B | Mark Levinson No.5802 is the cheaper watt - about $68 per watt against $95. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A Accuphase E-3000 B Mark Levinson No.5802
depends neither is better in the abstract - it turns on your room, your system or how you will use them. Only specs published for both amplifiers are judged; anything missing on either side is left out rather than guessed.
Which should you choose?
Mark Levinson No.5802 is the easier recommendation: it leads on most of the measured areas and costs less. Take Accuphase E-3000 if one of the "depends" rows above describes your system. If your speakers are a difficult load - 4 ohms nominal, big woofers, or a sensitivity in the low 80s - Mark Levinson No.5802 is the safer partner, because how an amplifier behaves when the impedance drops matters more than its 8-ohm rating. If you already own a DAC or a streamer, the built-in one is money you are paying twice for, and Accuphase E-3000 becomes the more rational buy.
What a spec sheet cannot show: how either sounds with your speakers, how the controls feel day to day, and what the app is like to live with - which is where most all-in-one amplifiers are actually won or lost. Power figures are the manufacturers' own and are not measured to a common standard, so treat small differences as noise. If you can hear both, that will tell you more than any row above.