| Sennheiser MX660 earplugs is worthy of the new MX series is the flagship model, the overall quality of comprehensive and outstanding performance. Particularly its three-balanced, just a little part in the IF polish, but only to allow a more pleasing sound orientation of the user's ears. Sound field, analytical aspects of the same highlights, the human voice, rock, pop-take, since MX series of all-round king was born. It is worth mentioning that, MX660 ear plugs annex more random, and also very practical, and this has always been "streamlining" of the Sennheiser, is a new breakthrough. In short, MX660 ear plugs or more appropriate to require a higher sound quality, but less well-off-on-hand in the choice of user groups. | 
