Frequency response accuracy

Aiming for a balanced, more studio-like presentation with precise placement and plenty of detail; the app EQ and guided tuning tools can further align frequency balance to preference without major tradeoffs.

Overall tonal balance and frequency response are widely praised, with several reviewers calling the tuning accurate or natural, especially with EQ options. Some note a V-shaped default signature with elevated treble and bass that can be adjusted with EQ.

Overall tuning is often labeled natural and accurate, but not universally neutral: some measurements and listeners cite an upper-mid (around 2–4kHz) underemphasis and/or a consumer-leaning warmth. The 5-band EQ and Sound Personalization are frequently recommended to align the response to personal preference.

Default tuning aims for a balanced, accurate profile (often described as gently warm or a soft V-shape), but some upper-mid/treble emphasis can show up with certain voices; EQ presets and the parametric EQ help dial it in.

Measured and subjective tuning is typically characterized as a soft V- or W-shaped signature that is close to common preference targets, with a noticeable bass shelf and lively treble. Because the out-of-box profile can sound bass-heavy or a touch bright depending on taste, light EQ or guided personalization is frequently recommended to improve balance.

Out-of-box tuning often emphasizes bass, but overall tonality is clean and can be made quite accurate with EQ; some listeners also note ANC can subtly change perceived balance.

Default tuning is closer to a balanced curve than many budget V-shaped earbuds, and reviewers often recommend using HearID/EQ to better match personal preferences and improve perceived accuracy.

Frequency response is described as consumer-friendly rather than strictly neutral, often with bass and treble emphasis and some midrange shaping. Most reviewers find it enjoyable, but neutral-seekers may prefer applying EQ.

Default tuning is not reference-accurate (generally v-shaped); getting a more balanced response usually requires Serenade/Golden Sound or manual EQ.

Adaptive EQ and fit or seal sensing aim to keep the tonal balance consistent across different ear shapes and imperfect fits, generally landing on a consumer-balanced response with boosted bass and smoothed upper mids; some measurement-focused reviews note uneven upper-mid and treble regions and variability depending on how the headphone detects leaks.

Multiple impressions suggest the tuning is not strictly neutral and can be volume- and seal-dependent, with boosted bass and treble at lower levels affecting perceived tonal accuracy.

Frequency response opinions vary: one measurement-focused review calls the stock response unusual and suggests EQ to correct bass/ear-gain balance, while others find Direct mode well balanced; overall it may not sound perfectly neutral out of the box for everyone.

Frequency response accuracy is mixed: measurements and subjective notes suggest the out-of-box or early firmware tuning can be uneven. Firmware updates plus EQ/personalization generally bring the response closer to a balanced, pleasing curve.

Measurements and listening impressions suggest the stock tuning can deviate from neutral/reference targets, with elevated bass and a dip in the upper mids that may push vocals back, plus energy in the 6–9kHz region that can highlight sibilance. The EQ and presets can improve balance, but some reviewers still struggled to fully correct the response.

Measured response and subjective notes suggest only average accuracy: a pronounced sub-bass lift and uneven treble can depart from a neutral target, even if many listeners still enjoy the overall tonality. Some reviews describe the default tuning as balanced enough for casual use, but it’s not a reference-style presentation.

Frequency response out of the box trends consumer-friendly with elevated lows and highs and comparatively less midrange presence, leading some listeners to call it veiled or muffled until adjusted. Other reviewers find it more balanced and refined than the XM4 stock tuning, but the consistent takeaway is that EQ meaningfully improves tonal balance and perceived detail.

Not tuned for strict neutrality—bass and treble are boosted (U/V-shape) and some listeners prefer flatter competitors; limited 3-band EQ and coarse presets restrict precise tonal correction.

Objective measurements show the INZONE H9 II’s frequency response diverging notably from a typical house curve, with a dipped ear gain region and subdued sub bass contributing to low timbre scores in MDAQS testing.