ATH-R70xa vs HD 660S2: Open-Back Headphones for Your Desk

ATH-R70xa vs HD 660S2 compares two open-back listening options for a quiet desk, with source matching and fit central to the choice.

The Audio-Technica ATH-R70xa and Sennheiser HD 660S2 are wired, open-back over-ear headphones. They let outside sound in and leak playback into the room. Neither is the natural starting point for commuting, a noisy shared space or loud headphone monitoring beside a sensitive microphone.

This comparison uses official specifications and practical setup criteria. It does not assign a measured sound-quality winner or pretend that printed frequency-response endpoints describe what you will prefer hearing.

The sensitivity figures use different reference units and cannot be ranked by simply comparing 97 with 104. Package contents can vary by region; confirm the AX listing for the exact item you are buying.

The R70xa has a clear published weight advantage, which may matter during long editing or listening sessions. It does not prove that every listener will find it more comfortable. Headband distribution, ear clearance, pad contact, glasses and head shape can outweigh a modest weight difference.

When evaluating fit, wear the headphone in your ordinary seated position, with the glasses you normally use. Check whether the cable pulls on one side and whether the ear pads sit evenly. A quick impression in the hand is less useful than how the headphone feels on your head.

Both models deserve a source check, but high impedance alone does not mean you must buy the same external amp for each. Read amplifier output specifications at an appropriate load and consider sensitivity and your listening level together.

JDS Labs Atom Amp 2 offers an analogue amplification route if your existing source is suitable. FiiO K11 R2R combines digital conversion and headphone amplification. Choose by the function your system needs; do not add a separate DAC merely because the headphone is open-back.

Editing or mixing: choose a quiet environment and learn the headphone with familiar reference material. Translation to speakers or other headphones remains important; a reference label does not remove that work.

Music: audition with tracks you know, at similar listening levels. Your preferred tonal balance cannot be read reliably from a maximum frequency number.

Gaming: either headphone still needs a separate microphone if you want voice chat. Comfort, game audio processing and the source path matter; neither product guarantees better positional accuracy or competitive results.

• Prioritise the R70xa: low published weight, a lightweight reference-oriented design and its supplied cable arrangement fit your desk.
• Prioritise the HD 660S2: its fit and supplied 6.35mm/4.4mm cable options match your system.
• Reconsider both: your room is noisy, other people need quiet, or your recording microphone hears headphone playback.

Build the budget around the headphone, any genuinely needed amplification and correct cables. Check replacement-pad availability and package contents before deciding on the total ownership cost.

For the related buying decision, read our Open-back vs closed-back headphones.

Is the ATH-R70xa the same as the older ATH-R70x?

No. Use the R70xa specifications and accessories for this model, rather than copying an older R70x review.

Does the HD 660S2 need its 4.4mm cable to work properly?

No. Use the cable suitable for the amplifier output. A correct single-ended connection can be entirely appropriate.

Which one is better for a noisy gaming room?

Both are open-back. If isolation is the main requirement, compare suitable closed-back headphones or headsets before choosing either.

• Headphone Impedance and Sensitivity: How to Choose an Amplifier
• 4.4mm vs 6.35mm Headphone Connections: Balanced Cables Explained
• DAC vs Headphone Amp vs Audio Interface: What Does Your Desk Need?

Explore Headphones

Check current configurations, included accessories and availability on the linked AX product pages. Ask AX about your exact setup.

AX price check, 26 October 2026: Audio-Technica ATH-R70xa Open-Back Reference Headphones — KWD 120.000 (in stock); Sennheiser HD 660S2 300 Ohm Open-Back Audiophile Headphones — KWD 179.900 (out of stock). The product cards show the current price and availability when you shop.

Explore AUDIO-TECHNICA at AX Kuwait, Sennheiser at AX Kuwait, JDS LABS at AX Kuwait for the rest of the range.