Our Verdict
The Superlux HD 668B are a good, budget option for neutral listening. They deliver a satisfying and tight bass that doesn't overpower the presence of instruments and vocals. They have a relatively flat mid-range but a slight bump in the high-mid /low-treble that makes them sound a bit sharp on some tracks especially with songs that are already a little bright. Sadly, they don't have a soundstage as immersive as some of the other fully open-back headphones, but overall the sound quality of the HD668 is sufficiently good for both casual and neutral listeners.
- Great sound quality.
- Lightweight design.
- Sensitive to noisy environments, by design.
- Plasticky build quality.
- Uncomfortably tight for some listeners.
Subpar for commuting. They're not intended for this use case as they don't block a lot of ambient noise, they're not portable and do not have the most durable build quality.
- Great sound quality.
- Lightweight design.
- Sensitive to noisy environments, by design.
- Plasticky build quality.
- Uncomfortably tight for some listeners.
Not made for sports. They're bulky and impractical to use outdoors. They're also not stable enough to use while doing physical activities and will slide off your ears if used while running or working out. Also, they don't have any controls, which makes controlling your music source while exercising a bit more difficult.
- Great sound quality.
- Lightweight design.
- Sensitive to noisy environments, by design.
- Plasticky build quality.
- Uncomfortably tight for some listeners.
Below-average for office use. They let a lot of noise seep into your audio and also leak a lot which might be distracting to your colleagues.
- Great sound quality.
- Lightweight design.
- Sensitive to noisy environments, by design.
- Plasticky build quality.
- Uncomfortably tight for some listeners.
- Great sound quality.
- Lightweight design.
- Sensitive to noisy environments, by design.
- Plasticky build quality.
- Uncomfortably tight for some listeners.
Changelog
- Updated Nov 11, 2021: Converted to Test Bench 1.5.
- Updated Mar 02, 2020: Converted to Test Bench 1.4.
- Updated Nov 21, 2019: Converted to Test Bench 1.3.1.
- Updated Nov 21, 2019: Converted to Test Bench 1.3.
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Popular Headphones Comparisons
The Superlux HD 668B and the Superlux HD 681 are both very good headphones if you like a balanced sound. While they both can sound quite harsh and sharp, the HD 668B feature a slightly bassier default sound. While both have a similarly disappointing build quality, the HD 681 are a fair bit more comfortable to wear.
The Superlux HD 668B are somewhat better headphones for neutral sound than the Samson SR850. They're very similar-looking semi-open headphones, but the Superlux have a much more accurate treble response, so they don't sound as sharp or piercing. Their audio cable is detachable, which is convenient if it gets damaged and needs replacing. They're also more breathable, but you may find the Samson's leather strap headband design more comfortable than the Superlux's cushioned headband.
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