Overview: The Sennheiser RS 165 Digital Wireless
headphone system consists of a pair of wireless headphones (HDR 165) and a radio
frequency (RF) transmitter (TR 165). The system is designed to enhance the sound
of your TV or your home audio source, and to give you the freedom to walk around
your home with the headphones on.
Wireless Headphones: The HDR 165's wireless headphones
feature a circum-aural (around-the-ear), closed design to significantly reduce
background noise. 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, and bass (to activate the Dynamic Bass Boost
feature). With the batteries installed, the HDR 165 headphones weigh
approximately 10.5 ounces.
TR 165 Transmitter: The transmitter connects to your
television's or audio system's audio output via the included 3.5mm cable. The
audio is transmitted on the 2.4 GHz band (2.40 to 2.48 GHz) with 8-FSK Digital
modulation. The transmitter can send signals to up to 2 pairs of headphones at
the same time. Transmission range is approximately 98 feet (30 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.
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.
Dynamic Bass Boost: The RS 165's Dynamic Bass Boost feature
raises the intensity of the bass when activated. You can turn the Bass Boost on
or off by pressing the Bass button on the transmitter, or on the headphones.
- Frequency Response: 18Hz - 21kHz
- Maximum Sound Pressure Level: 106dB at 1kHz, 3% THD
- Total Harmonic Distortion: <0.5% at 1 kHz, 100dB SPL
- Transmission Range: Up to 30m (98'), line of sight
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