I do not know anything about headphones. My husband gave me these, he said they work great. The case has some wear and tear. Please check photos over carefully.

Sennheiser HD 489 – Technical Specifications

Type:

• Dynamic, open‑back, circumaural (over‑ear)

Frequency Response:

• 12 Hz – 28,000 Hz

Impedance:

• 32 ohms

Sensitivity (SPL):

• ≈ 112 dB (1 kHz / 1 Vrms)

Total Harmonic Distortion (THD):

• < 0.1%

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🔊 Sound Profile (General Character)

The HD 489 is known for:

• Slightly emphasized bass compared to earlier HD 485
• Clear mids
• Crisp, somewhat bright treble
• Wide soundstage due to open‑back design

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Because they’re 32 ohms, they’re easy to drive and work well directly from phones, laptops, or portable players — no dedicated amplifier required (though an amp can improve performance).