AKG K551
Closed-back circumaural headphones from AKG with 50 mm transducers, featuring an in-line microphone, designed for isolated listening both at home and on the move.
Description
The K551 is a closed-back circumaural headphone from AKG, designed to offer isolated listening both on a home hi-fi system and on the move. Its closed-back design provides passive isolation from the outside environment, allowing you to focus on listening without being disturbed by ambient noise or disturbing those around you.
The headphones feature 50 mm dynamic transducers, a generous format that favours detailed reproduction. Their impedance of 32 Ω combined with a sensitivity of 114 dB SPL/V makes them an easy model to drive, including directly from a smartphone or portable player, without requiring dedicated amplification. The frequency response extends from 12 Hz to 28 kHz, covering a wide spectrum that exceeds the classic limits of audibility.
These headphones are aimed at those seeking versatile closed-back listening, capable of moving from sedentary use on a hi-fi system to portable use thanks to their light weight and integrated in-line microphone, handy for taking calls without removing the headphones.
Technical specifications
| Type | Closed-back circumaural headphones |
| Transducers | 50 mm dynamic |
| Impedance | 32 Ω |
| Sensitivity | 114 dB SPL/V |
| Frequency response | 12 Hz – 28 kHz |
| Microphone | In-line, with remote control |
| Weight | ≈ 305 g |
What to check before buying used
The ear pads and headband padding on these circumaural headphones are the first elements to check: flattened foam, cracked or peeling covering affect isolation and comfort, and can be remedied with compatible replacement ear pads. Also check the flexibility of the cable and the proper contact of the jack connector, as well as the operation of the microphone and in-line controls. Testing both transducers with the headphones on confirms the absence of crackling or channel balance issues.
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