Sennheiser HD 650 Stereo Reference Headphones

The Sennheiser HD 650 is an open-back reference headphone with 300 ohm impedance, a 10 Hz to 41,000 Hz range and 103 dB sound pressure level, weighing 269 g without the cable.

The warmer sibling

The HD 650 shares the HD 600's open circumaural design and 300 ohm impedance, and is voiced with a slightly fuller low midrange. That difference is small in measurement and clearly audible over a long session, which is why studios often keep both and why the two have been argued about for twenty years.

Frequency range is quoted at 10 Hz to 41,000 Hz with a sound pressure level of 103 dB. Weight is 269 g without the cable and 346 g with it.

Driving them

Three hundred ohms is a real load. A phone or a laptop socket will produce sound but not control, particularly at the bottom of the range where the impedance rises further. A headphone amplifier or an interface with a proper headphone stage is part of the purchase, not an upgrade to consider later.

The Sennheiser HDV 820 is the matching amplifier in the range, with balanced XLR3, XLR4, 6.3 mm and 4.4 mm Pentaconn outputs and distortion below 0.001 percent.

Open, so plan around the leakage

The open back gives the HD 650 its soundstage and its uncoloured low end, at the cost of isolation in both directions. These are headphones for a quiet room, not for a commute and not for a live tracking booth.

Specifications

• Type: Open back, circumaural, dynamic
• Impedance: 300 ohms
• Frequency range: 10 Hz to 41,000 Hz
• Sound pressure level: 103 dB
• Weight without cable: 269 g
• Weight with cable: 346 g
• Amplification: Headphone amplifier recommended

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