Short answer: the Superlux HD 668B. It ranks #29 of 481 over-ear headphones by sound quality, rated 4.3/5, at $49.99. The Superlux HD 660 Pro 150 Ohm ranks #84, rated 4.1/5, at $34, $15.99 cheaper, a saving that is not big enough to make up the sound-quality gap.
The case for the Superlux HD 668B: Measured response gives it an excellent Harman preference score of 89 with a 1.75 dB spread, and its mids sit within about 0.5 dB of target, so vocals and instruments sound natural. Watch for: A 7.3 dB peak near 5.6 kHz can make cymbals and sibilance sound sharp.
What the Superlux HD 660 Pro 150 Ohm does well: A preference score of 83 in oratory1990’s measurement is remarkable for a budget headphone, with sub-bass and bass about 1 dB above target down to 20 Hz for a full, punchy low end. Watch for: A 6.1 dB peak near 6.4 kHz can make sibilance and cymbals splashy, and a 7.2 dB dip near 9.4 kHz follows it, so the treble sounds uneven.
Buy the Superlux HD 668B. It is rated higher for sound quality, and the $15.99 you would save on the Superlux HD 660 Pro 150 Ohm does not close the gap.
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Measured response gives it an excellent Harman preference score of 89 with a 1.75 dB spread, and its mids sit within about 0.5 dB of target, so vocals and instruments sound natural.
Amazon $49.99 eBay
A preference score of 83 in oratory1990’s measurement is remarkable for a budget headphone, with sub-bass and bass about 1 dB above target down to 20 Hz for a full, punchy low end.
Thomann $34 eBayPrices on this page were last checked October 16, 2026 at 5:46 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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Specifications Side By Side
| Superlux HD 668B | Superlux HD 660 Pro 150 Ohm | |
|---|---|---|
| Price | $49.99 | $34 |
| Ranked | #29 of 481 in Over-Ear Headphones | #84 of 481 in Over-Ear Headphones |
| Form Factor | Over-ear | Over-ear |
| Back | Open | Closed |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 50mm dynamic | 1 x 40mm dynamic |
| Impedance | 56 ohms | 150 ohms |
| Sensitivity | 98 dB/mW | - |
| Frequency Response | 10Hz - 30kHz | 10Hz - 30kHz (Manufacturer specified) |
| Weight | 0.5 lbs (222 g) | 0.7 lbs (323 g) |
| Harman Preference Score | 89 (measured by oratory1990, via AutoEQ) | 83 (measured by oratory1990, via AutoEQ) |
| Deviation From Target | 1.75 dB standard deviation | 2.24 dB standard deviation |
| Tonal Tilt | +0.19 (negative is warmer, positive brighter) | -0.22 (negative is warmer, positive brighter) |
| Sub-bass Extension | Falls 6 dB below target at 42 Hz (-11.5 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+1.2 dB at 30 Hz) |
| Built-in Microphone | - | No |
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