Sennheiser HD 650508825 · titanium-silver · 300 ohm · standard 3 m unbalanced cable- Nominal impedance
- 300 ohmThis one: 120 ohm
- Weight
- 260 gThis one: 237 g
HEADPHONES
Sennheiser HD 505
Copper Edition (black with copper/bronze accents) · wired · Sennheiser part 700453
- Acoustic design
- Open-back
- Wearing style
- Over-ear (circumaural), open-back dynamic headphones
- Nominal impedance
- 120 ohm
The HD 505 (article 700453, sold as the Copper Edition) is a open-back around-ear headphone from Sennheiser's HD 500 family, with a 120-ohm dynamic transducer angled forward in the cup, high-grade metal mesh earcup covers, a detachable 1.8 m cable with a 3.5 mm plug and a rated 237 g without the cable. Sennheiser describes its response as very close to the Harman Curve and as extending further into sub-bass than the HD 599.
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THE ACTUAL PRODUCT
Compare with Sennheiser HD 650
Specifications checked 26 Sept 2026Manufacturer specifications, not a hands-on test.
The nearest checked headphones by key specifications, with what differs from the Sennheiser HD 505. The first matches the Compare button above.
Sennheiser HD 650508825 · titanium-silver · 300 ohm · standard 3 m unbalanced cable
Sennheiser HD 600508824 · grey finish · 300 ohm · standard 3 m stereo cable- Nominal impedance
- 300 ohmThis one: 120 ohm
- Weight
- 260 gThis one: 237 g
Sennheiser HD 660S2700240 · black with bronze accents · 300 ohm · 1.8 m balanced and unbalanced cables- Nominal impedance
- 300 ohmThis one: 120 ohm
- Weight
- 260 gThis one: 237 g
Key strengths
Its 107.9 dB at 1 V rating and 120-ohm impedance are published together, so buyers can judge how much voltage a phone, computer or amplifier needs to supply.
The cable is detachable, HD 500-series cables and accessories are stated to fit, and replacement ear cushions are offered.
A 3.5 mm plug with a screw-on 6.35 mm adapter covers both portable and hi-fi headphone sockets.
Before you buy
It is an open-back design, and Sennheiser publishes no ambient-noise attenuation figure for it.
The supplied detachable cable is 1.8 m long, with a 3.5 mm plug and a screw-on 6.35 mm adapter.
Sennheiser does not state the driver size or a tolerance for the frequency range.
Every specification. With its source.
Full specifications
Exact configuration: 700453 · Copper Edition (black with copper/bronze accents) · wired
19 specifications in 5 groups. Values are manufacturer specifications unless a row says “Measured result” or “Calculated from cited specifications”.
Design & fit
6 items
- Acoustic design
- Open-backSource
- Wearing style
- Over-ear (circumaural), open-back dynamic headphonesSource
- Weight
- 237 g
Without the cable.
Source - Ear pads
- Synthetic velourSource
- Construction
- High-grade metal mesh earcup covers; revised synthetic leather headband
- Serviceability
- HD 500-series cables and accessories are compatible; replacement parts such as ear cushions are offeredSource
Connections & battery
3 items
- Wired / wireless connections
- Wired analogue; detachable 1.80 m cable with 3.5 mm plug (left-side entry) and supplied 3.5-to-6.35 mm screw-on adapterSource
- Battery life
- Not listed by the manufacturer
The reviewed exact sources do not explicitly establish battery life or that no battery is required for operation. A wired/dynamic audio path, omitted charger or Battery included N is not an explicit operating-power requirement.
Source - Cable length
- 1.8 mSource
Audio specifications
7 items
- Nominal impedance
- 120 ohmSource
- Rated sensitivity
- 107.9 dB SPL (1 kHz, 1 Vrms)
Voltage reference (dB/V), not dB/mW.
Source - Driver construction
- Dynamic transducer, angled forward in the ear cupsSource
- Rated frequency range
- 12 Hz – 38.5 kHz
No tolerance is stated.
Source - Frequency tuning
- Response described as very close to the Harman Curve
Sennheiser's description of its published HD 505 response graph; not a measurement by this site.
Source - Manufacturer sub-bass claim
- Extends further into sub-bass than the HD 599Source
- Rated total harmonic distortion
- <0.2% (1 kHz / 90 dB SPL)
Rated at 1 kHz and 90 dB SPL; other models use different test levels, so compare with care.
Source
Calls & noise control
2 items
- Active noise cancellation
- Not listed by the manufacturer
The reviewed exact sources do not explicitly establish active noise cancellation absence. Preserve separately sourced acoustic design and passive attenuation; they cannot turn omitted ANC into a false capability.
Source - Microphone
- Not listed by the manufacturer
The reviewed exact sources do not explicitly establish microphone absence. Omission from a package or technical inventory, a stereo audio connector, and a without-remote statement do not establish microphone=false.
Source
In the box
1 item
- In the box
- Headphones, 1.80 m cable with 3.5 mm plug, 3.5-to-6.35 mm screw-on adapter, drawstring bagSource
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