Different price classes - JBL MA710 costs roughly 2x what Denon AVR-S570BT 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 | A | JBL MA710 has more power - 110W against 70W into 8 ohms. That is about 2dB, so it plays usefully louder before it runs out and has more in hand on peaks. |
| Speaker load rating | A | JBL MA710 is rated down to 4 ohms against 6, so it is the safer partner for a low-impedance speaker. |
| Analogue inputs | evenly matched | The same number of line-level inputs (2). |
| Phono stage | depends | JBL MA710 has a built-in phono stage and Denon AVR-S570BT 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. |
| Room to grow | evenly matched | The same expansion options on both. |
| Built-in sources | depends | Denon AVR-S570BT has a radio tuner built in. That is one less box if you still play discs or listen to radio, and dead weight if you do not. |
| Amplifier class | depends | JBL MA710 is D and Denon AVR-S570BT is AB. Class D runs cool and draws almost nothing at idle; 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 | B | Denon AVR-S570BT costs less - $449 against $880 at list. |
A JBL MA710 B Denon AVR-S570BT
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: JBL MA710 measures better, Denon AVR-S570BT costs about 49% less. With most speakers in most rooms that gap is smaller in practice than it looks here. If you play records, JBL MA710 saves you buying a phono stage; if you do not, ignore that row entirely. Think about the whole system: the roughly $431 saved by taking the cheaper one would buy better speakers or a subwoofer, which 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 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.