Koss KSC75 vs 7Hz Salnotes Zero:2
Quick take: The Koss KSC75 costs $5 less.
Which one to buy
These are two of the most recommended $20-25 headphones you can buy, and they're close to opposites. The Koss KSC75 is a 43g open clip-on: no clamp, no seal, nothing in your ear, and an airy, detailed, speaker-like sound that owners say embarrasses headphones costing five to ten times more. The 7Hz Salnotes Zero:2 is a sealed in-ear with exactly what the Koss lacks, warm, thick bass and sub-bass that make it the budget pick for EDM, hip-hop and the gym.
Bass is the biggest difference. The KSC75's foam pads can't seal, so sub-bass is basically absent and kick drums are polite. Owners who want more bass are told to buy a Porta Pro or an IEM like the Zero:2. The Zero:2, in turn, can't do the KSC75's open, effortless presentation. Its treble is polite where the Koss's can get spicy on bright recordings. Isolation follows the same split: the Koss is open and leaks everything, so it's a desk and gaming headphone, while the Zero:2 goes on the bus.
The Zero:2's chunky plastic shells can overwhelm small ears, and the Koss's clips bother a minority of owners, who often fix it with a $5 headband mod. Durability favors the Koss. Its thin cable is the usual eventual failure and its US lifetime warranty covers it. The Zero:2's cable detaches, but owners report a pattern of one channel dying within months and often just buy a new pair rather than ship a $25 item back.
Koss KSC75
If you listen at a desk or play games, wear glasses or hate clamping pressure, and want open, detailed sound with a lifetime warranty.
7Hz Salnotes Zero:2
If you want real bass, need isolation for commuting or the gym, and want a detachable cable you can swap for a mic cable.
| Spec | Koss KSC75 | 7Hz Salnotes Zero:2 |
|---|---|---|
| Approx. price | ~$20 | ~$25 |
| Rating | — | — |
| Type | Wired & Studio | Wired & Studio |
| Noise Cancelling | None | None |
| Battery (single charge) | — | — |
| Battery (with case) | — | — |
| Quick Charge | — | — |
| Codecs | — | — |
| Bluetooth | — | — |
| Multipoint | No | No |
| Driver Size | — | 10 mm |
| Weight | 43 g | — |
| Water Resistance | — | — |
| Wireless Charging | No | No |
| Transparency Mode | No | No |
| Spatial Audio | No | No |
| App EQ | No | No |
Pros & cons
Koss KSC75
- ✓Class-leading clarity and openness for around $20
- ✓Titanium-coated drivers with a wide, airy presentation
- ✓Roughly 43g — effectively weightless, no headband hair
- ✓Runs from any phone or laptop jack (60 ohm, 101 dB/mW)
- ✓Koss limited lifetime warranty
- ✓Massive mod community — headband and pad swaps are cheap and easy
- ✗Ear-clip design takes fiddling and bothers some ears until you mod a headband on
- ✗Zero isolation and full sound leakage — home/desk use only
- ✗Bass is tight but shallow; no sub-bass to speak of
- ✗Bright upper mids/treble can fatigue sensitive listeners
- ✗Build quality is as cheap as the price suggests
- ✗Fixed cable
7Hz Salnotes Zero:2
- ✓Reference-grade 'neutral with bass boost' tuning rare at any price
- ✓Cleaner and more balanced than the Chu II per owners who have both
- ✓Low-distortion 10mm dynamic with PU+metal composite diaphragm
- ✓Detachable 0.78mm 2-pin cable, with 3.5mm or USB-C and mic options
- ✓Light, comfortable shells for long sessions
- ✓Runs adequately from any phone or laptop jack
- ✗Short nozzles make a good seal genuinely hard for some ears — tip-rolling likely
- ✗Plastic shells and basic cable look and feel their price
- ✗No carry case or accessories beyond ear tips
- ✗32-ohm impedance wants a touch more volume than sensitive rivals
- ✗Bright colorways aren't for everyone
Koss KSC75 vs 7Hz Salnotes Zero:2: common questions
Which has more bass, the KSC75 or the Zero:2?▾
The Zero:2, by a wide margin. Its sealed in-ear fit and bass shelf deliver the sub-bass the open-backed KSC75 can't. The KSC75's bass improves with the headband mod or EQ, but it stays lean.
Is the KSC75 or the Zero:2 better for competitive gaming?▾
Owners favor the KSC75 for footsteps and positional cues, thanks to its clear upper mids and open presentation, plus a weightless fit for long sessions. The Zero:2 works fine from a controller and has a mic-cable option, but gaming isn't what it's known for.
Is the KSC75 or the Zero:2 more durable?▾
The Koss has the stronger reputation. Its drivers are long-lived, and the thin cable that eventually fails is covered by the US lifetime warranty. The Zero:2's cable is replaceable, but some owners report one earpiece dying within months.
Can I use the KSC75 or the Zero:2 on a commute?▾
Only the Zero:2 makes sense. The KSC75 is fully open, so it blocks nothing and everyone nearby hears your music.