Sennheiser HE 1 User Manual page 11

Notes on servicing
We recommend having the product serviced regularly (about every 3 years) to
H E 1
maintain the perfect sound reproduction of the electrostatic headphones and
the tube headphone amplifier. Contact your Sennheiser partner to arrange for
a complete revision and careful refreshment of the product (see "Contact" on
page 4).
The service card inserted in the rear cover of this instruction manual provides
information on the servicing carried out.
Notes on driver and firmware updates
We recommend using the latest DAC (digital-to-analog converter) firmware for
H E 1
your tube headphone amplifier and the latest driver for your operating system
(MacOS), Windows).
U P D A T E DAC firmware and driver updates can be downloaded free of charge from
the Internet at www.sennheiser.com/download or can be obtained from your
Sennheiser partner (see page 18 and 45).
Notes on the packaging
We recommend using the original packaging to ensure safe storage and
H E 1
transport of the HE 1. Damage during transport is often caused by the use
of unsuitable packaging. The original packaging of the HE 1 provides optimal
protection and minimizes the risk of damage during transport.
Alternatively, you can contact your Sennheiser partner to arrange for the
transport of the HE 1 (see "Contact" on page 4).
Important safety instructions
9