# Headphones Sennheiser HD 660S2 Over-ear Black

**URL:** https://aio.lv/en/product--sennheiser-700240--10496072
**Data updated:** 2026-02-12 21:57 (EET)
**Category:** Headphones
**Manufacturer:** Sennheiser
**Manufacturer code:** 700240
**EAN:** 810091270370
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 413.99 €
**Prices and availability valid until:** 2026-07-13 23:59
**Price without VAT (21%):** 342.14 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--sennheiser-700240--10496072

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 01.07.2026 | free |
| Pickup points | 06.07.2026 | 1.99 EUR |
| Courier delivery to door | 06.07.2026 | 4.99 EUR |

## Summary description

The Sennheiser HD 660S2 headphones are high-end over-ear models designed for audiophiles. They feature an open-back design for natural sound reproduction, a frequency response of 10-41,000 Hz, and comfortable ear pads for extended listening sessions. With a low impedance of 300 ohms, they are compatible with a wide range of devices, delivering rich and detailed audio performance.

## Long description

The Sennheiser HD 660S2 Over-ear Black are high-end open-back headphones engineered for accurate, natural sound reproduction. Designed for critical listening, they deliver a wide frequency response from 10 Hz to 41,000 Hz and detailed midrange articulation. The over-ear fit and soft ear pads provide comfort for extended sessions, while the open-back construction produces a spacious soundstage with precise imaging suitable for audiophiles and professional monitoring.
Advantages
Open-back acoustic design offers a natural, airy presentation and realistic stereo separation. Wide frequency response ensures both deep bass foundation and extended high-frequency clarity. Comfortable over-ear cushions and a lightweight headband reduce fatigue during long listening periods. Low nominal impedance improves compatibility with a variety of headphone amplifiers and higher-end portable devices, making the headphones flexible for home and studio use.
Suitable for
 Critical listening and audio mastering
 Home hi‑fi systems and desktop playback
 Music production and mixing reference
 Audiophile casual listening with external amplification
Key specifications
 Type: Over-ear, open-back
 Frequency response: 10–41,000 Hz
 Impedance: 300 ohms (nominal)
 Driver technology: Dynamic transducers optimized for detail and balance
 Cup and ear pad material: Soft padding for extended comfort
 Weight: Lightweight design for prolonged use
How to use
Position the headphones so the left and right cups align with the respective ears and adjust the headband for a comfortable, secure fit. For best performance, connect the headphones to a suitable headphone amplifier or audio interface that can drive a 300-ohm load; this ensures full dynamic range and clarity. Use a balanced or high-quality single‑ended output depending on the playback source, and avoid obstructing the open-back cups to maintain the intended soundstage and airiness.
Usage recommendations
For optimal results, use with dedicated headphone amplifiers or high-quality audio interfaces when listening on desktop or studio setups. Avoid using open-back headphones in noisy or public environments where sound leakage and ambient noise can interfere with the listening experience.

## FAQ

### How much does the Headphones Sennheiser HD 660S2 cost, and is it available for purchase?

The price is 413.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 51 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 01.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay, Installment. All transactions are 100% secure and encrypted.

### Can Headphones Sennheiser HD 660S2 be purchased with a lease?

Yes, the purchase is available both on credit and with an interest-free installment plan. Learn more about installments and credit options: https://aio.lv/en/payment#b3

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Sennheiser products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Sennheiser service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/10496072/66630355_large.webp