Sennheiser ActiveGard SH 300 User manual

SH 300
User
Manual
www.senncom.com
ActiveGard™ is an active system, which automatically compresses an incoming sound
that is too loud. As opposed to cutting the volume signal off, it actually compresses the
incoming signal to a safe level without distorting it. It also reacts in just a few milliseconds,
which is much faster than the human ear can even recognize.
Traditional systems work by simply clipping high-volume peaks. This, in turn, can
create severe, increasing, and uncomfortable distortion during a phone call. Since the
potentially dangerous energy of the volume signal is only reduced and not removed,
the headset speakers are still likely to transmit a very high, unpleasant, and maybe
even unsafe sound level.
Compression
Compression
Dialing Talking
Acoustic burst
Dialing Talking
Acoustic burst
Traditional
systems:
ActiveGard™
ActiveGard™
Peak-clipping
Traditional
systems: Peak-clipping
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www.senncom.com
SH 300
User
Manual
Technical data
Transmission data
Microphone ...............................................Noise Canceling
Frequency response ................................100 Hz – 3400 Hz
Sensitivity .................................................-34 dB
Distortion ..................................................Less than 1%
Receiving data
Impedance.................................................300 Ω
Frequency response ................................300 Hz – 3400 Hz
Sound pressure max ...............................104 dB SPL limited by ActiveGard™
Distortion ..................................................Less than 1%
Weight of headset...................................29 g / 0.67 oz
Wearing style ...........................................Over-the-ear (left or right ear)
Personal fit................................................3 adjustment speaker rings
Cable length..............................................1 m / 3.3 ft Kevlar®reinforced
Connector ..................................................Easy Disconnect
Ear-cap size...............................................Regular ø 20 mm / 0.78 inch
Accessories included
Carry bag, headset storage hook, clothing clip and microphone windscreen.
Safety instructions
· Avoid listening at high volume levels for long periods since this leads to permanent hearing defects.
· Keep children away from the SH 300. When playing, children can be strangled by the cables.
· Do not use the SH 300 in a damp or dusty environment.
SH 300_User manual.indd 1 09/05/07 11:04:52

2 cm
1Operating elements
A. Microphone boom arm
B. Hinged speaker
C. Ear-cap adapters
2Adapting the headset to your ear
A. Hinge the speaker to open position.
B. You can wear the same headset on both left and
right ear.
C. Hinge the speaker so that it fits into your ear.
For the best wearing comfort, allow the speaker to
open a bit. Turn the microphone boom towards your
mouth. The optimal microphone position is two cm
from the corner of the mouth.
3To connect the headset to the “Easy Disconnect” faci-
lity, plug in one half of the “Easy Disconnect” facility
into the other half until it locks into place. An audible
“click” should be heard.
4To disconnect the headset from the “Easy Disconnect”
facility, press one of the two release buttons (A).
The two halves of the “Easy Disconnect” facility auto-
matically disconnect.
5If the pre-assembled medium size ear-cap adapter
does not fit your ear, exchange the ear-cap adapter for
a larger or smaller one.
6The windscreen effectively reduces wind noise.
Slide the windscreen over the microphone.
The windscreen must totally enclose the microphone.
7 In order to always have the headset at hand, fasten
the supplied headset holder to your computer screen.
8 Affix the headset cable to the clothing by means of the
supplied cable clip. Attach the cable clip so that you
can freely move your head.
1
2
3 4
6
7 8
A
BC
B C
A
A
5
NB: Deutsch, Français, Italiano, Español, Português, Nederlands, Dansk, Svenska, Norsk is available from www.senncom.com
SH 300_User manual.indd 2 09/05/07 11:04:54