Different price classes - WiiM Amp Ultra costs roughly 2.2x what Sony STR-DH190 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 - 90W against 100W into 8 ohms is under 1dB, which is not an audible difference in loudness. |
| Built-in DAC | B | WiiM Amp Ultra has a DAC on board; the other needs an external one, which is another box, another power lead and another purchase. |
| Phono stage | depends | Sony STR-DH190 has a built-in phono stage and WiiM Amp Ultra does not. Decisive if you own a turntable, completely irrelevant if you do not - and an outboard phono stage is easy to add later either way. |
| Use with a TV | depends | Only WiiM Amp Ultra has HDMI ARC, so the television can drive it directly and one remote controls the volume. If the system is for music only, this changes nothing. |
| Amplifier class | depends | Sony STR-DH190 is Class A/B and WiiM Amp Ultra 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 | WiiM Amp Ultra takes up about 60% less shelf area (522cm² against 1299cm²), and it is 43mm shallower, which is the measurement that decides whether a rack door shuts. |
| Price | A | Sony STR-DH190 costs less - $248 against $549 at list. |
| Watts per dollar | A | Sony STR-DH190 is the cheaper watt - about $3 per watt against $5. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A Sony STR-DH190 B WiiM Amp Ultra
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?
Neither runs away with it - they trade advantages. Let the "depends" rows and the speakers you already own settle it. If you play records, Sony STR-DH190 saves you buying a phono stage; if you do not, ignore that row entirely. If this sits under a television, WiiM Amp Ultra is the one to buy - HDMI ARC means the TV remote controls the volume and there is no second box in the way.
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.