HD 660S2 Setup Guide: Source, Cables and Listening Space

This HD 660S2 setup guide explains how to plan the source, headphone cable and quiet listening space around the Sennheiser model available at AX Kuwait.

The Sennheiser HD 660S2 is an open-back dynamic headphone. It is a useful shortlist for a quiet listening desk where outside noise and sound leakage are manageable. It is a less direct answer for a shared room where other people need silence or where you need isolation from constant noise.

Consider how you will use it across the day: music, editing, gaming or calls with a separate microphone. The headphone does not include a chat microphone. Choosing the room and communication plan first prevents an otherwise strong audio purchase from becoming inconvenient in daily use.

The HD 660S2 is not the original HD 660S. Avoid copying an older model’s impedance or package details into a purchase decision. The complete model suffix is part of the specification.

A dedicated headphone amplifier can be useful when the existing output cannot deliver the listening level and headroom you need cleanly. The FiiO K7 combines digital inputs and headphone amplification; the JDS Labs Atom Amp 2 is an amplifier that needs an appropriate source feed.

These devices solve different connection requirements. Before buying, write down where the audio starts: computer USB, an optical output or an existing analogue line output. Then choose the device whose input accepts that signal. An amplifier with no suitable digital input cannot receive USB audio merely through an adapter cable.

The supplied 4.4mm cable provides a convenient option for a compatible balanced headphone output. The supplied 6.35mm cable is the straightforward choice for a suitable single-ended socket. Use each cable with the kind of output it was designed to connect.

Do not assume every 4.4mm socket is electrically balanced, and do not use an unsuitable adapter to force a shared-ground headphone connection onto a balanced amplifier output. The benefit of a different output depends on the device’s implementation and your actual level requirement, rather than the connector shape alone.

For multiplayer chat or meetings, a separate USB microphone can keep the headphone playback path simple. An XLR microphone needs a suitable interface or mixer. Choose based on the microphone’s connection and the controls you need, not an assumption that the headphone amplifier also has a microphone input.

Keep the microphone near enough to your voice that moderate gain works, and check whether sound leaking from the open headphones reaches it at your normal listening level. Test with the actual game and voice-chat application. A quiet-room desk can work well, but the result depends on the complete placement and routing.

1. Connect the chosen source to the DAC or amplifier using the correct input.
2. Connect the HD 660S2 with the matching cable.
3. Begin with a low volume and appropriate gain setting.
4. Confirm left and right playback with familiar material.
5. Test the microphone separately if using voice chat.
6. Save the working route before trying EQ or other processing.

Our impedance and sensitivity guide explains why the ohm figure alone is not an amplifier requirement. The balanced cable guide explains the output connections in more detail.

If you are also considering Audio-Technica, read the direct ATH-R70xa versus HD 660S2 comparison. Compare connection needs, room suitability and fit rather than treating different sensitivity units as a simple score.

If isolation is essential, begin again with a closed-back shortlist. A more expensive amplifier does not turn an open-back headphone into an isolating one. The best desk configuration is the one whose room, connections and day-to-day controls fit together without unnecessary accessories.

Does HD 660S2 need balanced output?

No. It includes a single-ended cable as well as a balanced cable. Choose a suitable output and cable for the source and listening level you need.

Can I connect a microphone to K7?

K7 is a DAC and headphone amplifier rather than a microphone interface. Use a separate USB microphone or a suitable XLR interface / mixer.

Is HD 660S2 good for a noisy shared room?

Its open-back design does not provide closed-back isolation and leaks sound. Room conditions should be part of the choice before considering amplifier upgrades.

• Audio-Technica ATH-R70xa vs Sennheiser HD 660S2: A Practical Buying Guide
• Headphone Impedance and Sensitivity: How to Choose an Amplifier
• 4.4mm vs 6.35mm Headphone Connections: Balanced Cables Explained

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

Explore Headphones. For help matching exact model numbers, contact AX Store Kuwait.

AX price check, 26 October 2026: Sennheiser HD 660S2 300 Ohm Open-Back Audiophile Headphones — KWD 179.900 (out of stock); JDS LABS ATOM AMP 2 Headphone Amplifier — KWD 59.900 (in stock). The product cards show the current price and availability when you shop.

Explore Sennheiser at AX Kuwait, JDS LABS at AX Kuwait, FiiO at AX Kuwait for the rest of the range.

For the related buying decision, explore the gaming IEM and earbud buying guide.