Gearank

Sennheiser HD 650 are based on the HD 600, along with improved features.

Aside from their lightweight aluminum voice coils made for smooth transient response and magnet systems for minimizing distortion, they have elliptical designed ear cups that fit comfortably on ears.

These also have a detachable cable that's made from highly conductive oxygen-free copper made for low handling noise.

Specifications

• Type: Open-back
• Driver Size: 40 mm
• Magnet Type: Neodymium
• Frequency Response: 10 - 41,000 Hz
• Maximum Input Power: 500 mW
• Sensitivity: 103 dB
• Impedance: 300 Ohms
• Weight: 9.12 oz
• Cable and Connectivity: 9.8 ft. Connection cable oxygen-free copper cable (OFC), 1/4" stereo jack plug, 1/4" adapter stereo jack plug to 1/8" stereo jack plug

Pros

Many experienced audio engineers said they have used these headphones to check their mixes for minuscule details due to their neutral sound. They provide an airy and wide soundstage that is nearly immersive. The bass, mids, and trebles are well balanced and it has a very flat response. In terms of comfort, the velour pads provided were very soft and most users experienced zero fatigue from listening for hours.

Cons

Since they require a bit more power it is best to use a headphone amp to maximize their sound quality, some users found them to sound thin when plugged into their portable device such as an mp3 player.

Overall

These are a great investment if you are looking for high-resolution headphones for referencing, mixing or high fidelity equipment.

The Sennheiser HD 650 Open-Back Headphones are currently on our recommended list for Mixing Headphones where you can see recording engineer Raphael Pulgar's analysis.