Different price classes - Audiolab Omnia costs roughly 1.8x what Marantz PM7000N does. Expect it to lead on paper; the question is whether you will hear the difference through the speakers you own.
| Area | Better | Why |
|---|
| Power | evenly matched | Effectively the same output - 50W against 60W into 8 ohms is under 1dB, which is not an audible difference in loudness. |
| Grip on hard loads | A | Audiolab Omnia holds up better into a 4-ohm load: its output increases strongly to 75W, where the other increases modestly. That matters with demanding speakers far more than the 8-ohm figure does. |
| Noise floor | B | Marantz PM7000N is the quieter design on paper - 115dB against 76dB. Audible mainly with sensitive speakers in a quiet room. |
| Built-in DAC | A | Both decode on board. Audiolab Omnia goes higher - 768kHz against 192kHz. Very few recordings exist above 192kHz, so treat this as headroom, not as sound quality. |
| Streaming | evenly matched | Only Audiolab Omnia has DTS Play-Fi; only Marantz PM7000N has AirPlay 2 and HEOS. Neither list is longer in a way that matters - check the one service you actually pay for. |
| Analogue inputs | A | Audiolab Omnia takes more analogue sources - 4 against 3. |
| Room to grow | A | Only Audiolab Omnia offers a pre-out/main-in loop - which decides whether you can add a subwoofer or a power amplifier later without replacing the box. |
| Built-in sources | depends | Audiolab Omnia has a CD player built in. That is one less box if you still play discs or listen to radio, and dead weight if you do not. |
| Price | B | Marantz PM7000N costs less - $1,299 against $2,300 at list. |
| Watts per dollar | B | Marantz PM7000N is the cheaper watt - about $22 per watt against $46. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A Audiolab Omnia B Marantz PM7000N
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?
The usual trade-off: Audiolab Omnia measures better, Marantz PM7000N costs about 44% less. With most speakers in most rooms that gap is smaller in practice than it looks here. If your speakers are a difficult load - 4 ohms nominal, big woofers, or a sensitivity in the low 80s - Audiolab Omnia is the safer partner, because how an amplifier behaves when the impedance drops matters more than its 8-ohm rating. Think about the whole system: the roughly $1,001 saved by taking the cheaper one would buy better speakers or a subwoofer, and either does more for the sound than the difference between two competent amplifiers.
What a spec sheet cannot show: how either sounds with your speakers, how the interface feels 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.