The invention provides a canal hearing device and method in which the device is implemented with a mode of operation that provides acoustic transparency as well as a power-saving function, particularly useful to permit the user to wear the device in the ear canal during periods of sleep or inactivity without substantial loss of normal unaided response. The ink sets include at least one pigment-based black ink having cationic and anionic dispersant groups, and at least one color dye or pigment that interacts with the black ink when printed on a receiving medium. In order to avoid this, the apparatus further comprises a variable delay unit coupled between the input and the splitter unit, for realizing a delay, the length of which is controlled by a control signal, and a control signal generator unit for generating said control signal. , at least 50% fiber volume fraction, a tensile strength in the range of about 160 to about 240 Ksi, a modulus of elasticity in the range of about 7 to about 30 Msi and a thermal expansion coefficient in the range of about 0 to about 6\xd710\u22126 mmC. The suppressor is lowered during an operation to divert the products so as to contact an upper surface of the products. The transmitted X-ray beam can be directed at an angle of incidence upon a crystal analyzer.