NF Acous NA20 VS HIDIZS MS2 Pro

The NF Acous NA20 is a single dynamic driver IEM built around the MC2L-100M unit with a beryllium-plated diaphragm and the brand’s SRA (Selective Reflection Adjustment) acoustic scheme that uses multiple damping meshes and sponges to reduce internal reflections. Its lightweight polycarbonate shell and ergonomic nozzle aim for long-term comfort and stability. These design details are documented on the official product page. Comfort remarks and ~4 g earpiece weight are also echoed in third-party coverage.

Tonally, multiple reviewers describe the NA20 as a V-shaped or relaxed, musical tuning with energetic bass, present upper-mids and generally smooth treble, prioritizing listenability over raw neutrality. Prime Audio calls it a “lively, well-executed V-shaped sound,” while Resonance Reviews notes a warm, smooth presentation with crisp treble.

On practicality, the NA20 is easy to drive (≈32 Ω, ≈109 dB), making it suitable for phones and low-power dongles; scaling with better sources is reported. At around $119 MSRP, it offers good value for a musical single-DD, though the QDC-style connectors and stock cable ergonomics are common criticisms.

The Hidizs MS2 Pro is a budget hybrid in-ear monitor with a 10.2 mm dual-magnetic dynamic driver plus a custom Silvercore BA in a zinc-alloy shell, running a low 17 Ω impedance and 111 dB sensitivity that keep it easy to drive from phones and dongle DACs.:contentReference[oaicite:0]{index=0} Hidizs positions it with an MSRP around $99 but frequently discounts it to about $69, placing it in the competitive sub-$100 segment where build quality and tuning options (three interchangeable nozzle filters) are key differentiators rather than premium accessories.:contentReference[oaicite:1]{index=1} Hidizs also markets the set as being tuned to the H-2019 target with its own warmer house flavor layered on top, which aligns with independent impressions of a fun but not strictly reference-neutral presentation.:contentReference[oaicite:2]{index=2}

Most measurements and subjective reports classify the MS2 Pro as a warm V-shaped or mildly U-shaped IEM: bass and upper treble are elevated for energy, while the midrange is only slightly recessed, keeping vocals reasonably clear rather than dramatically pushed back.:contentReference[oaicite:3]{index=3} The low end is described as punchy and full, with strong mid-bass impact and usable sub-bass extension; this gives the IEM a dense, rhythmic character, though some listeners may find the bass level slightly elevated for strictly neutral listening.:contentReference[oaicite:4]{index=4} Treble is moderately boosted with small peaks in the presence region: this adds clarity and detail but can sound slightly grainy or sharp in the upper mids for sensitive users, especially at higher volumes, while a somewhat relaxed top octave limits air compared to more expensive sets.:contentReference[oaicite:5]{index=5}

On the technical side, the MS2 Pro offers solid dynamics, respectable detail retrieval and particularly competent imaging, with reviewers highlighting its ability to place instruments clearly in space, even though overall soundstage size remains around average with more depth than extreme width.:contentReference[oaicite:6]{index=6} The three nozzle filters provide subtle shifts toward more balanced, brighter, or bass-emphasised profiles, but they do not transform the IEM into a neutral monitor; the core identity remains a warm, energetic, and generally smooth hybrid that prioritizes musical engagement over maximum microdetail.:contentReference[oaicite:7]{index=7} Given the performance level and sub-$100 pricing—and using a value-weighted scale where sub-$150 sets are capped below 7—a global score of about 6.8/10 is a reasonable summary: strong for its class but clearly short of true mid-tier or flagship performance.

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