HiFiMAN Sundara vs Sennheiser HD 660S2
Side-by-side comparison based on Reddit community data

#3 in Headphones
HiFiMAN
HiFiMAN Sundara
$179.00
100/100Excellent
100% positive0% neutral0% negative
Pros
- +Makes good headphones
- +Reviewed on hifi sites
Cons
- -Eventually needs upgrading
โThe only company I've seen advertised on socials that actually makes good headphones is Hifimanโ

#1 in Headphones
Sennheiser
Sennheiser HD 660S2
$419.99
75/100Good
75% positive17% neutral8% negative
Pros
- +Preferred sound/experience over sony ier-m9
- +Superior sound quality
- +Worth the investment
- +Neutral sounding (benchmark)
- +More bassy with eq
Cons
- -Ranked too high compared to better headphones
- -Expensive
- -Mids more in the background with eq
- -Soundstage inferior to speakers
โAfter buying the HD660S2, none of the IEMs beat its quality of sound, even the most expensive ones, so headphones it is.โ
Specifications Comparison
| Spec | HiFiMAN Sundara | Sennheiser HD 660S2 |
|---|---|---|
| Driver | 80mm Planar Magnetic | 42mm |
| Frequency Response | 6Hzโ75kHz | 8Hzโ41.5kHz |
| Impedance | 37ฮฉ | 300ฮฉ |
| Type | Open-back | Open-back |
| Weight | 372g | 260g |
| Connectivity | 3.5mm (with 6.35mm adapter) | 6.35mm + 4.4mm balanced |
| Driver Type | Planar Magnetic | โ |
| Noise Cancelling | โ | No |
| Price | $179.00 | $419.99 |
| Reddit Sentiment | 100% positive | 75% positive |
| Reddit Mentions | 3 | 12 |