One is a streaming all-in-one and the other is an amplifier. Judge them on how many boxes you want and what you already own, not on the spec sheet alone.
| Area | Better | Why |
|---|
| Power | B | Onkyo Icon A-50 has more power - 110W against 75W into 8 ohms. That is about 1.7dB, which is a small step in loudness but real headroom on peaks. |
| Grip on hard loads | B | Onkyo Icon A-50 holds up better into a 4-ohm load: its output increases strongly to 180W, where the other increases modestly. That matters with demanding speakers far more than the 8-ohm figure does. |
| Noise floor | B | Onkyo Icon A-50 is the quieter design on paper - 104dB against 90dB. Audible mainly with sensitive speakers in a quiet room. |
| Built-in DAC | B | Both decode on board. Onkyo Icon A-50 goes higher - 768kHz against 192kHz. Very few recordings exist above 192kHz, so treat this as headroom, not as sound quality. |
| Streaming | B | Only Onkyo Icon A-50 has AirPlay 2, Chromecast and Roon. |
| Room to grow | A | Only Advance Paris X-i75 offers a subwoofer output and a pre-out/main-in loop - which decides whether you can add a subwoofer or a power amplifier later without replacing the box. |
| Room correction | B | Onkyo Icon A-50 has room correction. In an awkward room that does more for the sound than any other difference on this page. |
| Amplifier class | depends | Advance Paris X-i75 is Class AB-T and Onkyo Icon A-50 is Class A/B. Class A/B runs warm and is the long-established mainstream choice. Modern examples of both measure well - judge by the rest of the page. |
| Price | A | Advance Paris X-i75 costs less - $1,299 against $1,600 at list. |
A Advance Paris X-i75 B Onkyo Icon A-50
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?
Onkyo Icon A-50 leads across most of the measured areas for a fairly modest premium, so it is the easier pick if the budget stretches. Advance Paris X-i75 is the one to take if it does not. If your speakers are a difficult load - 4 ohms nominal, big woofers, or a sensitivity in the low 80s - Onkyo Icon A-50 is the safer partner, because how an amplifier behaves when the impedance drops matters more than its 8-ohm rating.
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.