Short answer: the Topping A50 III. It ranks #2 of 19 headphone amplifiers by measured performance, rated 4.8/5, at $199. The JDS Labs Atom Amp 2 ranks #9, rated 4.7/5, at $129, $70 cheaper, which does not close the gap in measured performance.
The case for the Topping A50 III: Audio Science Review measured a SINAD of 121 dB, so its noise and distortion are inaudible. The catch: It is an amp only, so you need a separate DAC.
What the JDS Labs Atom Amp 2 does well: Audio Science Review measured a SINAD of 120 dB, so its noise and distortion are inaudible. The tradeoff: It has no DAC, so you need a separate source.
Buy the Topping A50 III. It is rated higher, and saving $70 with the JDS Labs Atom Amp 2 does not make up for the sound-quality gap.
Want more options? Browse the full Headphone Amps and DACs rankings.
Specifications Side By Side
| Topping A50 III | JDS Labs Atom Amp 2 | |
|---|---|---|
| Price | $199.00 | $129 |
| Ranked | #2 of 19 in Headphone Amplifiers | #9 of 19 in Headphone Amplifiers |
| Device Type | Headphone amp | Headphone amp |
| SINAD | 121 dB (measured by Audio Science Review) | 120 dB (measured by Audio Science Review) |
| Output Power (32 ohms) | 3,500 mW (manufacturer rated, balanced) | 2,650 mW (manufacturer rated) |
| Output Power (300 ohms) | 760 mW (manufacturer rated, balanced) | 286 mW (manufacturer rated) |
| Headphone Outputs | 6.35 mm, 4.4 mm balanced | 6.35 mm, 4.4 mm |
| Balanced Output | Yes (4.4 mm) | - |
| Inputs | RCA, 6.35 mm TRS balanced | RCA, 3.5 mm |
| Volume Control | Hardware knob | Hardware knob |
| Dimensions | 4.9” x 1” x 5.5” (125 x 26 x 140 mm) | 5.7” x 1.3” x 5.2” (145 x 34 x 131 mm) |
| Outputs | - | RCA |
| Weight | - | 1 lbs (454 g) |
Related Amp and DAC Comparisons
More worthwhile head-to-heads for Topping A50 III:
- Topping A30 Pro vs Topping A50 III
- Topping A50 III vs Topping A70 Pro
- Schiit Midgard vs Topping A50 III
- Topping A50 III vs Topping L30
- Topping A50 III vs Topping L50
Prices on this page were last checked October 11, 2026 at 4:59 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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The Two Amps and DACs In Full
Topping A50 III: $199.00 Amazon eBay
Pros: Audio Science Review measured a SINAD of 121 dB, so its noise and distortion are inaudible. A rated 3.5 W into 32 ohms and 760 mW into 300 ohms from its balanced output is enough for nearly any headphone. It has 6.35 mm and 4.4 mm balanced outputs and costs less than the Schiit Midgard at the same rating.
Cons: It is an amp only, so you need a separate DAC. Its balanced input uses 6.35 mm TRS rather than XLR, and there are no line outputs for passing the signal on to speakers.
Full Topping A50 III review and specifications →
| Released | Mar 2024 (2 years ago) |
|---|---|
| Balanced Output | Yes (4.4 mm) |
| Device Type | Headphone amp |
| Dimensions | 4.9” x 1” x 5.5” (125 x 26 x 140 mm) |
| Headphone Outputs | 6.35 mm, 4.4 mm balanced |
| Inputs | RCA, 6.35 mm TRS balanced |
| Output Power (300 ohms) | 760 mW (manufacturer rated, balanced) |
| Output Power (32 ohms) | 3,500 mW (manufacturer rated, balanced) |
| SINAD | 121 dB (measured by Audio Science Review) |
| Volume Control | Hardware knob |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
JDS Labs Atom Amp 2: $129 JDS Labs eBay
Pros: Audio Science Review measured a SINAD of 120 dB, so its noise and distortion are inaudible. A rated 2,650 mW into 32 ohms and 286 mW into 300 ohms drives nearly any headphone, and it offers both 6.35 mm and 4.4 mm outputs. It matches the rating of the Topping L50 for less and adds RCA preamp outputs for powered speakers.
Cons: It has no DAC, so you need a separate source. Its inputs are RCA and 3.5 mm only, with no balanced XLR input, and the Topping A50 III rates slightly higher for a bit more.
Full JDS Labs Atom Amp 2 review and specifications →
| Device Type | Headphone amp |
|---|---|
| Dimensions | 5.7” x 1.3” x 5.2” (145 x 34 x 131 mm) |
| Headphone Outputs | 6.35 mm, 4.4 mm |
| Inputs | RCA, 3.5 mm |
| Output Power (300 ohms) | 286 mW (manufacturer rated) |
| Output Power (32 ohms) | 2,650 mW (manufacturer rated) |
| Outputs | RCA |
| SINAD | 120 dB (measured by Audio Science Review) |
| Volume Control | Hardware knob |
| Weight | 1 lbs (454 g) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons