Overview: The Sennheiser RS 185 Digital Wireless
headphone system consists of a pair of wireless headphones (HDR 185) and a radio
frequency (RF) transmitter (TR 185). The system is designed to enhance the sound
of your home audio source, and to give you the freedom to walk around your home
with the headphones on.
Wireless Headphones: The HDR 185's wireless headphones
feature an open, circumaural (around-the-ear) design. The soft-padded ear cups
and headband provide hours of listening comfort. The headphones have controls on
the right ear cup: power on/off, volume up, volume down, balance left, balanced
right, and level (for selecting manual and automatic level control). With the
batteries installed, the HDR 185 headphones weigh approximately 11 ounces.
Analog/Digital Inputs: The RS 185 Digital Wireless headphone
system can accept both analog and optical digital input signals. The digital input can
only accept PCM signals with a sampling rate of up to 96kHz--it is not compatible with digital bitstream signals.
The TR 185 transmitter has analog stereo RCA and digital Toslink input
connectors, and includes both analog and digital cables.
TR 185 Transmitter: The system transmits audio on the 2.4 GHz band (2.40 to 2.48 GHz)
with 8-FSK Digital modulation. The extended transmission range is approximately
328 feet (100 meters) without obstructions. (Typical performance with obstructions will be somewhat less.) The transmitter is powered by
a 9-volt DC power supply/AC adapter. Adapter plugs for the US, Europe, UK, and
Australia are provided, allowing for use in other countries. The transmitter
doubles as a convenient charging cradle for the headphones. Transmitter
dimensions: 4.96"W x 9.264"H x 3.96"D.
Level Control: There are two modes for setting the analog
signal input level: Automatic Level Control (ALC) and Manual Level Control (MLC).
When set to ALC, the sensitivity of the analog input is adjusted automatically
to avoid undesirable volume jumps when switching from one audio device to
another, or from one music track to another. You can switch between ALC and MLC
by pressing the Level button on the headphones or the transmitter.
Balance Control: The left/right audio balance can be
adjusted by pressing the Balance Left or Balanced Right buttons on the
headphones until the balance is set to your liking. You can center the balance
by pressing both buttons simultaneously.
Rechargeable Batteries: The headphones are powered by the
two included "AAA" rechargeable NiMH batteries (1.2V, 820mAh). The batteries
fully charge in approximately 8.5 hours, when placed on the top of the
transmitter. Battery life is approximately 18 hours of use. Standard,
non-rechargeable "AAA" batteries may be used in the headphones, but the
headphones must not be placed on the charging cradle.
Auto Power Off: If there is no signal from the transmitter
for more than 5 minutes, the headphones automatically switch to standby mode.
If the headphones are outside the transmission range or switched to off for more
than 5 minutes, the transmitter automatically switches to standby mode.
- Frequency Response: 17Hz - 22kHz
- Maximum Sound Pressure Level: 106dB at 1kHz, 3% THD
- Total Harmonic Distortion: <0.5% at 1 kHz, 100dB SPL
- Transmission Range: Up to 100m (328')
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