Audio and Sound Quality
The Nokia E51 delivers reliable sound performance with a 2.5 mm audio jack, deviating from the standard 3.5 mm jack, which requires an adapter for using regular headphones. Its loudspeaker provides clear audio at decent levels: 67dB for voice, 65dB for noise, and 71dB for ring, suitable for both personal and business use. The audio quality demonstrates good noise management at -76.4dB and crosstalk at -74.8dB, ensuring comprehensible communication.