Different price classes - JBL MA9100HP costs roughly 2.1x what Yamaha RX-V6A 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 | B | JBL MA9100HP has more power - 140W against 100W into 8 ohms. That is about 1.5dB, which is a small step in loudness but real headroom on peaks. |
| Analogue inputs | A | Yamaha RX-V6A takes more analogue sources - 3 against 2. |
| Room to grow | evenly matched | The same expansion options on both. |
| Built-in sources | depends | Yamaha RX-V6A 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 | Yamaha RX-V6A is AB and JBL MA9100HP is 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. |
| Price | A | Yamaha RX-V6A costs less - $850 against $1,760 at list. |
| Watts per dollar | A | Yamaha RX-V6A is the cheaper watt - about $9 per watt against $13. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A Yamaha RX-V6A B JBL MA9100HP
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?
Yamaha RX-V6A has the edge on paper, though not by much. The rows marked "depends" are more likely to decide this than the score is. Think about the whole system: the roughly $910 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.