Short answer: the Moondrop Para 2. It ranks #88 of 216 over-ear headphones by sound quality, rated 3.9/5, at $499.99. The Sennheiser HD 660S2 ranks #94, rated 3.8/5, at $479.95, $20.04 cheaper, not enough of a saving to outweigh the sound-quality gap.
The case for the Sennheiser HD 660S2: Oratory1990’s measurement gives it a preference score of 78 with a smooth midrange, as the band from 200 Hz to 6 kHz stays within about 1.4 dB of the Harman target and the largest peak above 1.5 kHz is under 2 dB. Watch for: Sub-bass falls about 6.5 dB below target and is 6 dB short by 40 Hz, and an open back means bass is felt less and sound leaks out freely.
Buy the Moondrop Para 2. It is rated higher for sound quality, and saving $20.04 with the Sennheiser HD 660S2 does not make up for the sound-quality gap.
Looking for alternatives? See the complete Headphones rankings.
Specifications Side By Side
| Moondrop Para 2 | Sennheiser HD 660S2 | |
|---|---|---|
| Price | $499.99 | $479.95 |
| Ranked | #88 of 216 in Over-Ear Headphones | #94 of 216 in Over-Ear Headphones |
| Form Factor | Over-ear | Over-ear |
| Harman Preference Score | 79 (median of 3 squig.link measurements, calibrated to AutoEQ) | 78 (measured by oratory1990, via AutoEQ) |
| Deviation From Target | 2.37 dB standard deviation | 2.36 dB standard deviation |
| Tonal Tilt | +0.27 (negative is warmer, positive brighter) | -0.43 (negative is warmer, positive brighter) |
| Sub-bass Extension | Falls 6 dB below target at 47 Hz (-6.9 dB at 30 Hz) | Falls 6 dB below target at 40 Hz (-7.4 dB at 30 Hz) |
| Connection | Wired | Wired |
| Back | Open | Open |
| Driver Type | Planar magnetic | Dynamic |
| Drivers | 1 x 100mm planar magnetic | 1 x 38mm dynamic |
| Impedance | 9 ohms | 300 ohms |
| Sensitivity | 106 dB/Vrms | 104 dB SPL/V |
| Frequency Response | 20Hz - 42kHz (Manufacturer specified) | 8Hz - 41.5kHz (Manufacturer specified) |
| Built-in Microphone | No | No |
| Weight | - | 0.6 lbs (260 g) |
Related Headphone Comparisons
More top alternatives to Moondrop Para 2:
- Grado Hemp vs Moondrop Para 2
- Moondrop Para 2 vs AKG K712
- AKG K712 vs Sennheiser HD 660S2
- HIFIMAN Edition XV vs Sennheiser HD 660S2
- Cleer Next vs HIFIMAN Mini Shangri-La
Prices on this page were last checked October 11, 2026 at 4:59 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.
As an eBay Partner, we may be compensated if you make a purchase.
The Two Headphones In Full
Moondrop Para 2: $499.99 Amazon eBay
Full Moondrop Para 2 review and specifications →
| Released | 2025 (1 year ago) |
|---|---|
| Back | Open |
| Built-in Microphone | No |
| Connection | Wired |
| Deviation From Target | 2.37 dB standard deviation |
| Driver Type | Planar magnetic |
| Drivers | 1 x 100mm planar magnetic |
| Form Factor | Over-ear |
| Frequency Response | 20Hz - 42kHz (Manufacturer specified) |
| Harman Preference Score | 79 (median of 3 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 9 ohms |
| Sensitivity | 106 dB/Vrms |
| Sub-bass Extension | Falls 6 dB below target at 47 Hz (-6.9 dB at 30 Hz) |
| Tonal Tilt | +0.27 (negative is warmer, positive brighter) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Sennheiser HD 660S2: $479.95 B&H Photo Video eBay
Pros: Oratory1990’s measurement gives it a preference score of 78 with a smooth midrange, as the band from 200 Hz to 6 kHz stays within about 1.4 dB of the Harman target and the largest peak above 1.5 kHz is under 2 dB. Voices, strings and piano come across natural and free of harshness. The gently warm balance suits long listening sessions at home.
Cons: Sub-bass falls about 6.5 dB below target and is 6 dB short by 40 Hz, and an open back means bass is felt less and sound leaks out freely. A 7.9 dB dip near 9.3 kHz dulls cymbal shimmer, and its 300 ohm impedance with 104 dB/V sensitivity calls for a dedicated headphone amp. The cheaper Austrian Audio Hi-X65 rates the same. See headphone amps and DACs with enough power to drive it.
Full Sennheiser HD 660S2 review and specifications →
| Released | Feb 2023 (3 years ago) |
|---|---|
| Back | Open |
| Built-in Microphone | No |
| Connection | Wired |
| Deviation From Target | 2.36 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 38mm dynamic |
| Form Factor | Over-ear |
| Frequency Response | 8Hz - 41.5kHz (Manufacturer specified) |
| Harman Preference Score | 78 (measured by oratory1990, via AutoEQ) |
| Impedance | 300 ohms |
| Sensitivity | 104 dB SPL/V |
| Sub-bass Extension | Falls 6 dB below target at 40 Hz (-7.4 dB at 30 Hz) |
| Tonal Tilt | -0.43 (negative is warmer, positive brighter) |
| Weight | 0.6 lbs (260 g) |
EQ preset to match the Harman target
Set a preamp of -6.4 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by AutoEQ from its measured frequency response.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +7.6 dB | 0.70 |
| Peak | 98 Hz | -3.5 dB | 0.31 |
| Peak | 8,089 Hz | +4.7 dB | 0.53 |
| Peak | 5,567 Hz | -6.6 dB | 3.92 |
| Peak | 1,206 Hz | -2.0 dB | 2.46 |
| High shelf | 10,000 Hz | -3.8 dB | 0.70 |
| Peak | 2,218 Hz | +1.1 dB | 3.75 |
| Peak | 3,206 Hz | -1.2 dB | 3.51 |
| Peak | 4,367 Hz | +1.3 dB | 6.00 |
| Peak | 115 Hz | +0.1 dB | 1.26 |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons