These are not the same size of amplifier: Parasound Halo JC1+ has roughly 2.6x the power of Naim NAP 350. That is about 4.1dB, 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 | B | Parasound Halo JC1+ has more power - 450W against 175W into 8 ohms. That is about 4.1dB, so it plays usefully louder before it runs out and has more in hand on peaks. |
| Grip on hard loads | evenly matched | Both behave much the same into 4 ohms - output nearly doubles (345W and 850W). |
| Analogue inputs | B | Parasound Halo JC1+ takes more analogue sources - 2 against 1. |
| Amplifier class | depends | Naim NAP 350 is Class A/B and Parasound Halo JC1+ is Class A/AB. 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. |
| Shelf space | depends | Naim NAP 350 takes up about 40% less shelf area (1371cm² against 2274cm²), and it is 191mm shallower, which is the measurement that decides whether a rack door shuts. |
| Price | evenly matched | Priced within a few per cent of each other. |
| Watts per dollar | B | Parasound Halo JC1+ is the cheaper watt - about $19 per watt against $49. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A Naim NAP 350 B Parasound Halo JC1+
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 Halo JC1+ has the edge on paper, though not by much. The rows marked "depends" are more likely to decide this than the score is. 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 - Parasound Halo JC1+ has the headroom, and headroom is what stops an amplifier hardening up on peaks. At desk distance or in a small room, 175 watts is already more than most people ever use, and the extra 275 watts would be headroom you pay for and never hear - we rate Parasound Halo JC1+ 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.