No single best amplifier here. What decides it is what you have to drive, what you need to plug in, and how much of the system you want in one box.
| Area | Better | Why |
|---|
| Power | A | Parasound JCM250 has more power - 250W against 170W into 8 ohms. That is about 1.7dB, which is a small step in loudness but real headroom on peaks. |
| Speaker load rating | A | Parasound JCM250 is rated down to 1 ohms against 4, so it is the safer partner for a low-impedance speaker. |
| Analogue inputs | evenly matched | The same number of line-level inputs (2). |
| Amplifier class | depends | Parasound JCM250 is Class A/AB and TEAC AP-701B is Class D. Class D runs cool and draws almost nothing at idle. Modern examples of both measure well - judge by the rest of the page. |
| Price | B | TEAC AP-701B costs less - $4,000 against $4,250 at list. |
| Watts per dollar | A | Parasound JCM250 is the cheaper watt - about $17 per watt against $24. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A Parasound JCM250 B TEAC AP-701B
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?
Parasound JCM250 leads across most of the measured areas for a fairly modest premium, so it is the easier pick if the budget stretches. TEAC AP-701B is the one to take if it does not.
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.