Overview: The Sennheiser RS 175 Digital Wireless
headphone system consists of a pair of wireless headphones (HDR 175) and a radio
frequency (RF) transmitter (TR 175). 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 175'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, surround (to activate Virtual Surround Sound),
and bass (to activate the Dynamic Bass Boost feature). With the batteries
installed, the HDR 175 headphones weigh approximately 10.9 ounces.
TR 175 Transmitter: The transmitter connects to your
television's or audio system's audio output via the included 3.5mm cable or
optical digital cable (accepts 2ch PCM audio only). You can switch between the two inputs with a provided
toggle switch. 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. 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.
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 175'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.
Virtual Surround Sound: The headphone system offers two
virtual surround sound modes (Hi/Lo) that simulate the presence of external
speakers. Special signal processing produces a spatial sound quality, with
differences in intensity between the Hi and Lo modes. You can engage Virtual
Surround Sound from the transmitter or the headphones.
- Frequency Response: 17Hz - 22kHz
- Maximum Sound Pressure Level: 114dB at 1kHz, 3% THD
- Total Harmonic Distortion: <0.5% at 1 kHz, 100dB SPL
- Transmission Range: Up to 100m (328')
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