Different price classes - Parasound Halo A23+ costs roughly 2x what Parasound NewClassic 2125 v.2 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 - 150W against 160W into 8 ohms is under 1dB, which is not an audible difference in loudness. |
| Room size | depends | We rate Parasound NewClassic 2125 v.2 the better fit for desk or near-field listening, a small room and a mid-size room, and Parasound Halo A23+ for a very large room. Match the amplifier to the room you actually have, not the one you want. |
| Grip on hard loads | evenly matched | Both behave much the same into 4 ohms - output increases strongly (225W and 240W). |
| Analogue inputs | evenly matched | The same number of line-level inputs (2). |
| Room to grow | evenly matched | The same expansion options on both. |
| Amplifier class | depends | Parasound NewClassic 2125 v.2 is Class A/B and Parasound Halo A23+ 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. |
| Price | A | Parasound NewClassic 2125 v.2 costs less - $1,250 against $2,500 at list. |
| Watts per dollar | A | Parasound NewClassic 2125 v.2 is the cheaper watt - about $8 per watt against $16. A blunt measure, and it says nothing about how either sounds, but it is the honest one for raw output. |
A Parasound NewClassic 2125 v.2 B Parasound Halo A23+
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 NewClassic 2125 v.2 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 $1,250 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.