# Wired open-back headphones Sennheiser HD 650 — 300 Ω impedance, 10–41,000 Hz, 3 m cable, 6.35 mm adapter

**URL:** https://aio.lv/en/product--sennheiser-508825--3062188
**Data updated:** 2026-01-21 10:52 (EET)
**Category:** Headphones
**Manufacturer:** Sennheiser
**Manufacturer code:** 508825
**EAN:** 4044155249552
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 305.99 €
**Prices and availability valid until:** 2026-07-16 23:59
**Price without VAT (21%):** 252.88 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--sennheiser-508825--3062188

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 02.07.2026 | free |
| Pickup points | 07.07.2026 | 1.99 EUR |
| Courier delivery to door | 07.07.2026 | 4.99 EUR |

## Summary description

Sennheiser HD 650 are wired, open-back around-the-ear headphones for audiophile use. They feature a 300 Ω impedance, frequency response 10–41,000 Hz, 102 dB sensitivity, 0.05% THD and neodymium dynamic transducers. Supplied with a 3 m cable and 6.35 mm adapter, they are intended for high-quality critical listening with compatible amplifiers and DACs.

## Long description

The Sennheiser HD 650 are open-back, over-ear wired headphones designed for audiophiles seeking accurate, natural sound reproduction. Built on the experience of the HD 600, these headphones use optimised magnet and diaphragm systems, low-mass aluminium voice coils and a refined damping element to deliver detailed transient response, low distortion and a balanced tonal character across a wide frequency range (10–39,500 Hz). The detachable, highly conductive OFC cable and comfortable headband with soft ear pads support extended listening sessions.
Advantages
Systems are selected with narrow tolerances (±1 dB) and matched in pairs to ensure consistent channel balance. The magnet system is optimised to minimise harmonic and intermodulation distortion, while the lightweight aluminium voice coils improve transient response. A specially developed damping element made from fine acoustic metal mesh provides even damping across the diaphragm surface and remains stable across climates. The detachable cable is made from highly conductive OFC copper with low handling noise, and the connectors include a gold-plated 6.35 mm jack plug with a 3.5 mm adapter. The headphones feature a high-quality titanium/silver finish and are built for precise, lifelike sound reproduction.
Suitable for
Critical listening and mastering
Audiophile home listening
Reference playback in a studio environment
Long-duration listening sessions
Key specifications
Frequency response: 10–39,500 Hz
Impedance: 300 Ω
Sound pressure level (SPL): 103 dB
Total harmonic distortion: 0.05%
Connector: gold-plated 6.35 mm jack with 3.5 mm adapter
Cable length: 3 m (detachable, OFC copper)
Ear coupling: Circumaural (over-ear)
Wearing style: Head-band
Colour: Grey, Black
How to use
Connect the detachable cable to the left earcup and plug the jack into your audio source using the supplied 6.35 mm plug or the 3.5 mm adapter. Position the headband so the ear pads fully enclose the ears for optimal seal and comfort. For best results, allow a brief break-in period for the transducers and use a high-quality headphone amplifier or source with sufficient output for a 300 Ω load.
Usage recommendations
Use a dedicated headphone amplifier or a high-output source to drive the 300 Ω impedance properly. Store the headphones in a dry place and avoid exposing the ear pads and cable to excessive heat or moisture. Replace the detachable cable or pads with manufacturer-approved parts to preserve sound characteristics and fit.

## Specifications

### Headphones

| Feature | Value |
|---|---|
| Headphone frequency | 10 - 41000 |
| Impedance | 300 Ω |
| Ear coupling | Circumaural |
| Acoustic system | Open |
| Driver type | Dynamic |

### Ports & interfaces

| Feature | Value |
|---|---|
| Connectivity technology | Wired |
| Bluetooth | No |
| Connector contacts plating | Gold |
| USB connectivity | No |
| 3.5 mm connector | No |
| 2.5 mm connector | No |
| 6.35 mm connector | Yes |
| RF connectivity | No |

### Performance

| Feature | Value |
|---|---|
| Cable length | 3 m |
| Product colour | Grey, Black |
| Total Harmonic Distortion (THD) | 0.05 % |
| Volume control | No |
| Wearing style | Head-band |
| Sound pressure level (max) | 103 dB |
| Recommended usage | Music |
| Product type | Headphones |

### Microphone

| Feature | Value |
|---|---|
| Noise-canceling | No |
| Microphone type | Not available |

### Design

| Feature | Value |
|---|---|
| Foldable | No |

### Weight & dimensions

| Feature | Value |
|---|---|
| Weight | 260 kg |

### Packaging data

| Feature | Value |
|---|---|
| Package depth | 255 mm |
| Package height | 315 mm |
| Package width | 106 mm |

### Logistics data

| Feature | Value |
|---|---|
| Master (outer) case height | 330 mm |
| Master (outer) case width | 330 mm |
| Master (outer) case gross weight | 10706.64 g |
| Master (outer) case length | 525 mm |
| Products per master (outer) case | 6 pc(s) |
| Shipping (inner) case gross weight | 1654.44 g |
| Products per shipping (inner) case | 1 pc(s) |

### Supplier features

| Feature | Value |
|---|---|
| Country of origin | Ireland |

## FAQ

### How much does the Sennheiser HD 650 wired open-back headphones cost, and is it available for purchase?

The price is 305.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 29 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 02.07.2026 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 Sennheiser HD 650 wired open-back headphones 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

### How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: ear coupling, connectivity technology, cable length, weight, wearing style, product colour, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

## Image

https://aio.lv/img/cache/product/3062188/50465233_large.webp