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JDS Labs Atom Amp+
Conceived as the next-generation replacement to Objective2, Atom builds on more than a decade of amplifier design evolution at JDS Labs. Atom Amp+ tops the award winning Atom Amp with hand matched potentiometers and even higher performance, and comes fully loaded with a smooth 1/4" headphone jack, gold-plated preamp RCA outputs, and both 3.5mm and RCA inputs. Ample power. No noise. Front-mounted controls. Atom Amp+, our standard for performance and value in a headphone amp.
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JDS Labs Atom Amp+
The Atom Amp+ delivers remarkably clean, neutral amplification in a pocket-sized chassis, pairing measured accuracy with surprising punch. With a frequency response of 20Hz–20kHz +/-0.01 dB, SINAD of 119 dB @2VRMS and an SNR >122 dB, it yields incisive detail, very low background noise and tight channel balance—qualities noted by Audiophilepure. Its sustained 9.05 VRMS output and ability to drive loads up to 600 Ω give it confident dynamics and headroom for most headphones, while an output impedance under 0.7 Ω and dual gain make it IEM- and headphone-friendly.
Hand-matched volume gangs, a compact steel case and straightforward RCA/3.5 mm I/O keep the focus on sound. At about $99 this is a high-value, no-frills amp for audiophiles seeking transparent gain without added DAC or networking. Low-noise, high-precision.
Pros
- Extremely low noise and high measured transparency (SNR >122 dB; SINAD 119 dB @2VRMS) for a quiet, detailed background.
- Strong sustained output (9.05 VRMS) and the ability to drive loads up to 600 Ω, providing solid headroom and dynamic control for many headphones.
- Well-executed mechanical control and channel matching — hand-matched volume gangs and channel balance under 0.6 dB — reflecting careful build quality.
Sound Quality
90/100
Reviewer highlights strong sustained voltage delivery (9.05 VRMS) and ability to drive up to 600 Ω loads, supporting good headroom and transient authority for most headphones. While not a multi-watt desktop powerhouse (1 W @ 32 Ω), the Atom Amp+ delivers lively, punchy dynamics for typical dynamic and many planar headphones within its power envelope.
Noise Floor
90/100
Measured noise is very low (1.99 µV, SNR >122 dB) and the review explicitly states noise is minimal across the frequency range, indicating a very quiet background suitable for sensitive IEMs. No reviewer mentions audible hiss, and specs support a near-silent performance.
Headphone Compatibility
90/100
Output impedance <0.7 Ω is ideal for IEMs and multi-driver earphones, and dual gain (1.0x / 4.5x) adds useful flexibility. Power ratings (1 W @ 32 Ω, 545 mW @ 150 Ω, 136 mW @ 600 Ω) mean it drives most dynamics and many planars well, but very power-hungry planars that require multi-watt delivery may be beyond its optimal range.
Build Quality
90/100
Reviewer notes hand-matched volume gangs and precisely tuned knobs; the Atom Amp+ is compact and well put together. Channel balance <0.6 dB and quality control detail imply robust assembly and good component selection for the price.
Features Connectivity
83/100
Baseline analog inputs (RCA plus 3.5 mm) and an RCA preamp output are present; dual gain and sub-1 Ω output are useful. Lacks a built-in DAC, balanced headphone outputs, digital inputs or streaming features, keeping the feature set intentionally simple and focused.
Value for Money
94/100
At an approximate price of $99 the review calls the numbers "very good" for the amp's size and explicitly notes value relative to price. Given its measured performance, low noise and build detail, reviewers present it as an excellent value in its segment.
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