These are not the same size of amplifier: Emotiva BasX A1 has roughly 3.6x the power of Yamaha WXA-50. That is about 5.6dB, so it is a question of room size and how hard your speakers are to drive, not of one being the better amplifier.
| Area | Better | Why |
|---|
| Power | A | Emotiva BasX A1 has more power - 200W against 55W into 8 ohms. That is about 5.6dB - a different class of amplifier rather than a bigger version of the same one, and far more than most rooms will ever ask for. |
| Room size | depends | We rate Emotiva BasX A1 the better fit for a large room and a very large room, and Yamaha WXA-50 for desk or near-field listening, a small room and a mid-size room. Match the amplifier to the room you actually have, not the one you want. |
| Grip on hard loads | B | Yamaha WXA-50 holds up better into a 4-ohm load: its output nearly doubles to 105W, where the other increases strongly. That matters with demanding speakers far more than the 8-ohm figure does. |
| Noise floor | evenly matched | Much the same signal-to-noise ratio (112dB vs 110dB). |
| Built-in DAC | B | Yamaha WXA-50 has a DAC on board; the other needs an external one, which is another box, another power lead and another purchase. |
| Analogue inputs | A | Emotiva BasX A1 takes more analogue sources - 2 against 1. |
| Amplifier class | depends | Emotiva BasX A1 is Class A/B and Yamaha WXA-50 is Class D. Class A/B runs warm and is the long-established mainstream choice; Class D runs cool and draws almost nothing at idle. Modern examples of both measure well - judge by the rest of the page. |
| Shelf space | depends | Yamaha WXA-50 takes up about 66% less shelf area (572cm² against 1700cm²), and it is 127mm shallower, which is the measurement that decides whether a rack door shuts. |
| Price | A | Emotiva BasX A1 costs less - $569 against $599 at list. |
| Watts per dollar | A | Emotiva BasX A1 is the cheaper watt - about $3 per watt against $11. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A Emotiva BasX A1 B Yamaha WXA-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?
Emotiva BasX A1 has the edge on paper, though not by much. The rows marked "depends" are more likely to decide this than the score is. If your speakers are a difficult load - 4 ohms nominal, big woofers, or a sensitivity in the low 80s - Yamaha WXA-50 is the safer partner, because how an amplifier behaves when the impedance drops matters more than its 8-ohm rating. Start with the room. In a large or open-plan room, or with speakers that are hard to drive - low sensitivity, or an impedance that dips - Emotiva BasX A1 has the headroom, and headroom is what stops an amplifier hardening up on peaks. At desk distance or in a small room, 55 watts is already more than most people ever use, and the extra 145 watts would be headroom you pay for and never hear - we rate Emotiva BasX A1 poorly for near-field use for exactly that reason.
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.