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Compare 4 products

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Koss UR40 Headphones
Koss UR40
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Sennheiser PX 100-II Headphones
Sennheiser PX 100-II
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Superlux HD668 Headphones
Superlux HD668
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Superlux HD681 Headphones
Superlux HD681
Available colors
Editiorial reviews
2
2 editorial reviews
I'll write up a full review later, but these circumaural open headphones are just UNBELIEVABLE!   A recent pair of on ear headphones had impressed me with their sound quality, but were a major letdown in terms of comfort (lack thereof). Therefore, I began a search for potentially great...Read more
The Koss UR-20 are below-average headphones that perform poorly in most of our test categories. They are moderately comfortable but have a weak, unexciting sound...Read more
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5
5 editorial reviews
The Sennheiser PX-100-II are an open headphones designed for use when out and aboutRead more
The Sennheiser PX 100-II is a very good, stylish set of headphones that will nevertheless live in the shadow of the excellent original.Read more
The Sennheiser PX-100-II are an open headphones designed for use when out and aboutRead more
Read editorial reviews
4
4 editorial reviews
On a budget, you'd be hard-pressed to find better-sounding headphones for the money.Read more
Superlux HD 668B: Review by Headfonia - The Headphone Enthusiast's WebsiteRead more
The Superlux HD 668B are great-sounding and affordable critical listening headphones. They let in a lot of ambient noise and leak enough to be distracting to tho...Read more
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7
3.9 out of 5
3 user ratings
5 stars
0 %
4 stars
100 %
3 stars
0 %
2 stars
0 %
1 stars
0 %
Read editorial reviews
User rating
37
4.1 out of 5
37 user ratings
5 stars
32 %
4 stars
43 %
3 stars
24 %
2 stars
0 %
1 stars
0 %
36
4.2 out of 5
36 user ratings
5 stars
41 %
4 stars
36 %
3 stars
22 %
2 stars
0 %
1 stars
0 %
42
4.3 out of 5
42 user ratings
5 stars
42 %
4 stars
42 %
3 stars
14 %
2 stars
0 %
1 stars
0 %
111
3.7 out of 5
111 user ratings
5 stars
33 %
4 stars
23 %
3 stars
27 %
2 stars
14 %
1 stars
1 %

Technical details

Sound outputStereoStereoStereoStereo
StyleOver-EarOn-EarOver-EarOver-Ear
Connectivity technologyWiredWiredWiredWired
Headset (integrated/enclosed microphone)nononono
Magnet material
N/A
NeodymiumNeodymiumNeodymium
Diaphragm material
N/A
Duofol
N/A
N/A

Design

Colour of product
  • Black
  • Black,Grey
  • Black,Silver
  • Silver
  • Black
  • White
Black
  • Black
  • Black,Red
  • Grey
Acoustic designClosedClosedHalf openedHalf opened
Attachment typeHeadbandHeadbandHeadbandHeadband
Foldableyesyes
N/A
N/A
Body material
N/A
  • Metal
  • Plastic
N/A
Leather
Category
N/A
Travel and Commuting
N/A
Audiophile
Connector contacts plating
N/A
N/A
GoldGold

Dimensions

Weight6.1 oz2.61 oz7.83 oz9.74 oz
Width
N/A
N/A
7.4 in7.36 in
Depth
N/A
N/A
4.17 in4.21 in
Height
N/A
N/A
7.87 in7.87 in

Sound

Impedance60.0 Ω32.0 Ω56.0 Ω32.0 Ω
Frequency range15 - 2200015 - 2700010 - 3000010 - 30000
Driver technologyDynamicDynamicDynamicDynamic
Total harmonic distortion (THD)0.2 %0.1 %
N/A
0.25 %
Diaphragm diameter
N/A
1.57 in
N/A
2.0 in
Driver size
N/A
N/A
1.97 in1.97 in

Connectivity

Cable length1.21.232.5
Type of connector3.5mm3.5mm3.5mm3.5mm
USBnononono
Detachable cablenonoyesno
Inputs supported
N/A
3.5mm
N/A
  • 3.5mm
  • 6.35mm
3.5 mm/6.3 mm adapter included
N/A
noyesyes

Power

Battery operatednononono
Power handling capacity
N/A
N/A
300.0 mW300.0 mW

Often compared with Koss UR40

Often compared with Sennheiser PX 100-II

Often compared with Superlux HD668

Often compared with Superlux HD681