7Hz Salnotes Zero vs KZ ZSN Pro X

Short answer: the KZ ZSN Pro X, if you are buying new. The 7Hz Salnotes Zero ranks higher than it (#4 vs #19 of 68 in-ear headphones, 4.8/5 vs 4.0/5) but is discontinued, so only consider it used; the KZ ZSN Pro X is still sold new at $23.99. The 7Hz Salnotes Zero’s replacement, the 7Hz x Crinacle Zero 2, is rated 3.9/5 at $24.99.

The 7Hz Salnotes Zero is the better-sounding pick. A Harman score of 84 from a single 10 mm dynamic driver at a bargain price is remarkable. The tradeoff: Presence and treble run about 2.1 to 2.2 dB under target, and a 6.2 dB dip near 10 kHz leaves cymbals and breath detail muted.

What the KZ ZSN Pro X does well: The hybrid design with a 10mm dynamic driver and a balanced armature gives bass about 3.6 dB above target at 60 to 200 Hz, which adds punch and warmth for pop and hip hop. Watch for: A 7.2 dB peak near 8.1 kHz and an air band about 5.8 dB above target can make cymbals and s sounds sharp or hissy at higher volume.

Buy the KZ ZSN Pro X new; the 7Hz Salnotes Zero is no longer sold new, so it only makes sense as a used find.

Want more options? Browse the full Headphones rankings.

Specifications Side By Side

Related Headphone Comparisons

How 7Hz Salnotes Zero compares with other leading options:

• Truthear x Crinacle Zero RED vs 7Hz Salnotes Zero
• 7Hz Salnotes Zero vs Truthear Gate
• KZ ZSN Pro X vs KZ ZSN Pro
• Truthear x Crinacle Zero RED vs Tin HiFi T3 Plus
• Truthear x Crinacle Zero RED vs Tin HiFi T4

Prices on this page were last checked October 10, 2026 at 5:37 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 Headphones In Full

7Hz Salnotes Zero: $22.99 Discontinued Amazon eBay

Newer model: the 7Hz x Crinacle Zero 2, ranked lower, rated 3.9/5, released Nov 2023. See every 7Hz Zero generation.

Pros: A Harman score of 84 from a single 10 mm dynamic driver at a bargain price is remarkable. Bass and mids sit within about 0.3 dB of the target, so vocals and instruments are balanced naturally with a 1.31 dB deviation. It runs from a phone without difficulty at 32 ohms and 108 dB per volt. It beats the 7Hz x Crinacle Zero 2 on rating at a similar cost.

Cons: Presence and treble run about 2.1 to 2.2 dB under target, and a 6.2 dB dip near 10 kHz leaves cymbals and breath detail muted. Sub-bass is about 1.5 dB light, so the deepest rumble in electronic music is understated. The sensitivity is lower than many rivals, so it needs a bit more volume headroom from weak sources. Discontinued.

Full 7Hz Salnotes Zero review and specifications →

Released	Jul 2022 (4 years ago)
Back	Closed
Connection	Wired
Deviation From Target	1.31 dB standard deviation
Driver Type	Dynamic
Drivers	1 x 10mm dynamic
Form Factor	In-ear
Frequency Response	10Hz - 20kHz (Manufacturer specified)
Harman Preference Score	84 (measured by oratory1990, via AutoEQ)
Impedance	32 ohms
Sensitivity	108 dB SPL/V
Tonal Tilt	-0.16 (negative is warmer, positive brighter)

EQ preset to match the Harman target

Set a preamp of -2.5 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by AutoEQ from its measured frequency response.

Filter	Frequency	Gain	Q
Low shelf	105 Hz	-0.4 dB	0.70
Peak	7,148 Hz	+2.5 dB	1.39
Peak	186 Hz	-1.3 dB	1.35
Peak	65 Hz	+1.7 dB	1.11
Peak	1,677 Hz	-1.1 dB	1.82
High shelf	10,000 Hz	-1.3 dB	0.70
Peak	857 Hz	+0.9 dB	1.64
Peak	9,824 Hz	+0.9 dB	1.98
Peak	3,316 Hz	-0.6 dB	2.50
Peak	1,261 Hz	-0.7 dB	3.34

• Reviews, Comparisons and Sound Samples
  • AutoEQ results for the 7Hz Salnotes Zero (oratory1990 measurement)
• Head-to-Head Comparisons
  • 7Hz Salnotes Zero vs Truthear Gate
  • 7Hz Salnotes Zero vs Truthear x Crinacle Zero RED

KZ ZSN Pro X: $23.99 Amazon eBay

Pros: The hybrid design with a 10mm dynamic driver and a balanced armature gives bass about 3.6 dB above target at 60 to 200 Hz, which adds punch and warmth for pop and hip hop. A preference score of 74 at an inexpensive price is strong, and the 25 ohm impedance with 112 dB/mW sensitivity makes it easy to drive from a phone. It also suits a warm or v-shaped taste.

Cons: A 7.2 dB peak near 8.1 kHz and an air band about 5.8 dB above target can make cymbals and s sounds sharp or hissy at higher volume. The 3 to 4 kHz region dips about 2.9 dB, so vocals can sound a little distant. It has no wireless features or noise cancelling.

Full KZ ZSN Pro X review and specifications →

Released	Jul 2020 (6 years ago)
Back	Closed
Connection	Wired
Deviation From Target	2.09 dB standard deviation
Driver Type	Hybrid (1 dynamic + 1 balanced armature)
Drivers	1 x 10mm dynamic + 1 x balanced armature
Form Factor	In-ear
Frequency Response	7Hz - 40kHz (Manufacturer specified)
Harman Preference Score	74 (measured by oratory1990, via AutoEQ)
Impedance	25 ohms
Sensitivity	112 dB/mW
Tonal Tilt	-0.17 (negative is warmer, positive brighter)

EQ preset to match the Harman target

Set a preamp of -3.8 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by AutoEQ from its measured frequency response.

Filter	Frequency	Gain	Q
Low shelf	105 Hz	+0.8 dB	0.70
Peak	928 Hz	+5.3 dB	0.66
Peak	166 Hz	-3.4 dB	0.67
Peak	2,193 Hz	-4.4 dB	0.61
Peak	3,392 Hz	+6.1 dB	2.82
High shelf	10,000 Hz	-4.4 dB	0.70
Peak	6,459 Hz	+3.5 dB	5.25
Peak	4,968 Hz	-3.5 dB	5.59
Peak	4,039 Hz	+1.3 dB	6.00
Peak	5,964 Hz	+0.9 dB	5.91

• Reviews, Comparisons and Sound Samples
  • AutoEQ results for the KZ ZSN Pro X (oratory1990 measurement)
• Head-to-Head Comparisons
  • KZ ZSN Pro X vs KZ ZSN Pro