Amazon.com: Sennheiser CX400-II-B In-Ear Headphone with Dynamic Speaker System and Integrated Vol Controls (Discontinued by Manufacturer) : Electronics
Measurement's report Sennheiser CX-400 II - Reference Audio Analyzer
Sennheiser CX 300 II (Kabelgebunden) - kaufen bei digitec
Sennheiser CX 400-II Precision (Kabelgebunden) - kaufen bei digitec