Excerpt: Another well-built, nicely thought-out addition to the headphone hierachy from Denon . We'll give a special mention for the most clearly labelled L/R design here (as pictured) plus the extra flexibility offered by their two-part, extendable cable.
Excerpt: Denon's AH-C551 earphones include an acoustic optimiser, designed to improve audio quality by ensuring that the air is at the same pressure both behind and in front of the vibrating diaphragm that creates the sound. They're clear, with a powerful bass. If anything, the driving bass is too strong, drowning out the weaker mid-range tones and high notes. We got more balanced and well-defined sound when we reduced the bass volume on our audio source.
Summary: Within the top three sub-£100 earphone models, the Denon C551s are absolutely stunning all-rounders, with clean, powerful bass performance. Combined with the supplied carry case and gold-plated connections, these are remarkable 'phones for the price
Pros: Sound quality, Price, Build, Excellent bass performance, Hard case supplied
Cons: Doesn't use Denon C700 cabling, Slightly weaker with highs compared to lows and mids