Just like the HD 600 and the HD 650 before it, the new HD 660 S is another great hi-fi headphone for home use. The revisions and minor improvements are legitimate and suit the series well – even if the surcharge seems to be a bit steep for the moment. I do not agree with the decision to include a symmetrical Pentaconn cable, but otherwise, considering the complete package, there is very little cause for criticism.
Sennheiser have once again delivered a very well-balanced and ambitious set of headphones, which can actually be blindly recommended for almost all purposes. However, if you already own one of the headphones from the six hundred series, you might save yourself the upgrade, depending on your requirements. Despite the new technology, the relationship to its siblings cannot be denied.
