Sennheiser ActiveGard SH 300 User Manual

ActiveGard™
Acoustic burst
Dialing Talking
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
Traditional
systems:
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.
ActiveGard™
Dialing Talking
Traditional
systems:
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SH 300_User manual.indd 1
Compression
Peak-clipping
Compression
Acoustic burst
Peak-clipping
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
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.
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SH 300
User
Manual
reinforced
®
09/05/07 11:04:52