The German audio expert Sennheiser began shipping its new flagship in-ear headphones, commonly known as earbuds, in late April. Priced at $1,000, the Sennheiser IE 800s feature a number of innovations that are new to this category of headphones. The first and most noticeable design element is the dual chambers of each earbud, which isolate lower frequencies from higher ones to avoid the sonic masking effect that occurs when loud low-end responses overpower higher tones. Each of these chambers is equipped with …