Overview: The Sennheiser HD 1 Wireless
headphones have a closed circumaural (over-the-ear) design with Bluetooth
technology and NoiseGard Hybrid active noise cancellation. The headphones come
with a straight connecting cable for those times when you can't go wireless, a
USB charging cable for the internal battery, a soft cloth drawstring pouch, and
a semi-hard clamshell case for storage.
Bluetooth: The HD 1 Wireless headphones have Bluetooth
version 4.0 + EDR which pairs to your phone or audio device in seconds. You can
make and receive phone calls and stream audio wirelessly in a range of up to
33', depending upon environmental conditions. Bluetooth 4.0 is compatible with
devices having Bluetooth versions 1.1 through 4.0. The headphones have the
following profiles: Headset Profile (HSP 1.2), Hands-Free (HFP 1.6), Audio/Video
Remote Control Profile (AVRCP 1.5), Advanced Audio Distribution Profile (A2DP
1.3), and Device ID Profile (DIP 1.3).
aptX: With aptX audio coding, the HD 1 Wireless headphones deliver
clean, crisp audio in full stereo. If your Bluetooth audio source supports aptX,
the headphones will automatically stream music wirelessly in aptX high-quality
mode. If the device is not equipped with aptX, the music will be streamed in the
standard quality mode.
Near-Field Communications (NFC): If you are using the
headphones with a device that supports NFC, you can wirelessly connect the
device by touching, or placing it within close proximity of, the "N" logo on the
front of the left earcup.
NoiseGard: The HD 1 Wireless headphones feature the
NoiseGard hybrid Active Noise Cancellation. NoiseGard is a combination of two
noise-cancellation systems with a total of 4 microphones. The two microphones on
the outside work as a Feed-Forward system that reduces high-frequency noise,
while the two on the inside of the earcups act as a Feed-Back system to reduce
low-frequency noise. Together, the two microphone systems reduce ambient
noise by up to 25dB over a broad frequency spectrum. The NoiseGard hybrid Active Noise Cancellation
system only works when the headphones are powered on. Even with the power off,
the closed, around-the-ear design shuts out much of the external noise.
Rechargeable Battery: The HD 1 Wireless headphones are powered by
an internal, 3.7VDC 600mAh Lithium-Polymer rechargeable battery. The battery
charges in about 3 hours via USB power (using the supplied Micro USB cable) from
a laptop, an AC-powered USB charging port, or a mobile 12-volt USB charging
port. While charging, you can continue listening to music or making calls from
your smartphone via a Bluetooth connection. A fully-charged battery provides approximately 22 hours, using both
Bluetooth and Active Noise Cancellation. You can keep track of the remaining
battery life through the multi-color LED and voice prompts.
VoiceMax: The headphones utilize VoiceMax technology with
two built-in microphones for voice communications. With two microphones, speech
quality is enhanced, and external noise is removed. VoiceMax allows you to
conduct clear phone conversations, as well as voice control functions with your
smartphone, without the need of an external microphone.
Phone/Music Controls: You can control your streaming audio
and phone calls using the 3-way multi-function button on the bottom of the right
earcup. The button uses the same protocol as most other headphone remote
controls with a pattern of button presses, however some smartphones may not
support all functions. Phone controls allow you to accept,
end, and reject calls, and redial. If you receive a call during another active
call, you can choose to accept the new call by ending the active call or placing
it on hold and toggling between the two calls. Music controls include play/pause
a song, play the next or previous song, and rewind or fast-forward a song. Phone
and music controls are only available if the headphones and smartphone are
connected via Bluetooth.
Audio Cable: If you can't listen to the headphones
wirelessly, you can still enjoy your music through a wired connection. An
straight audio cable is provided with a right-angled 3.5mm mini-plug. In Active
Mode, you can still take advantage of NoiseGard hybrid Active Noise Cancellation
when using the headphones with the audio cable, however, the phone and music
control functions will be disabled. In Passive Mode, Active Noise Cancellation
is turned off. An Airline audio adapter is included so you can plug into
in-flight entertainment on most domestic and international airliners. Phone and
music controls are not available when the audio cable is plugged in.
Design and Materials: The HD 1 Wireless headphones are
equipped with lightweight brushed stainless steel sliders, a luxurious, real
leather headband, and redesigned ear cushions with memory foam. The headphones
fold into a compact package that you can place in the silky drawstring pouch or
the semi-hard clamshell case with a zippered closure.
- Frequency Response: 16Hz - 22kHz
- Impedance: 28Ω passive, 480Ω active
- Total Harmonic Distortion (THD): <0.5%
- Sound Pressure Level (SPL): 113dB passive
- Frequency Response:
- Wideband: 100Hz - 8000Hz
- Narrowband: 300Hz - 3400Hz
- Pickup Pattern: Dual omni-directional
- Sensitivity: -44dB V/Pa (1 kHz)