AKG WMS 450 Mode D'emploi page 36

• INFO
Diagram 14: Calling up information
about the receiver.
4.2 HT 450 Handheld
Transmitter
4.2.1 Muting the Microphone
Refer to fig. 3 on page iv.
4.2.2 Microphone Technique
• Working Distance and
Proximity Effect
Refer to fig. 13 on page vi.
• Angle of Incidence
Refer to fig. 13 on page vi.
• Feedback
Refer to fig. 14 on page vi.
• Backing Choir
Refer to fig. 15 on page vi.
4.2.3 PB 1000 and PPC 1000
(HT 450/C only)
30
4 Operating Notes
The INFO screen lets you call up information about your receiver.
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1. Set the ON-MUTE/PRG-OFF switch (19) to "MUTE/PRG" (center position).
• If you switched from "OFF" to "MUTE/PRG":
The transmitter audio and RF sections are OFF and the status LED (20) is dark. The infrared receiv-
er section is ON. The transmitter is in setup mode and you can program the carrier frequency and
input gain.
The display indicates the frequency in MHz - frequency in Preset form - "Prg IR" and changes to
alternating between the currently selected Preset and "Prg IR".
• If you switched from "ON" to "MUTE/PRG":
The microphone is muted and the status LED (20) will change from green to red. The infrared
receiver section is OFF. Since the RF section continues transmitting the carrier frequency, no
unwanted noises will become audible form the sound system.
The display alternates between the currently selected Preset and the remaining battery capacity in
hours.
2. To switch the microphone back on, set the ON-MUTE/PRG-OFF switch (19) to "ON".
The status LED (20) will change to green. The display will indicate the remaining battery capacity in
hours.
A handheld vocal microphone provides many ways of shaping the sound of your voice as it is heard over
the sound system.
The following sections contain useful hints on how to use your HT 450 handheld transmitter for best
results.
Basically, your voice will sound the bigger and mellower, the closer you hold the microphone to your lips.
Moving away from the microphone will produce a more reverberant, more distant sound, as the micro-
phone will pick more of the room's reverberation.
You can use this effect to make your voice sound aggressive, neutral, insinuating, etc. simply by chang-
ing your working distance.
Proximity effect is a more or less dramatic boost of low frequencies that occurs when you sing into the
microphone from less than 2 inches. It gives more "body" to your voice and an intimate, bass-heavy
sound.
Sing to one side of the microphone or above and across the microphone's top. This provides a well-bal-
anced, natural sound.
If you sing directly into the microphone, it will not only pick up excessive breath noise but also overem-
phasize "sss", "sh", "tch", "p", and "t" sounds.
Feedback is the result of part of the sound projected by a speaker being picked up by a microphone, fed
to the amplifier, and projected again by the speaker. Above a specific volume or "system gain" setting
called the feedback threshold, the signal starts being regenerated indefinitely, making the sound system
howl and the sound engineer desperately dive for the master fader to reduce the volume and stop the
howling.
To increase usable gain before feedback, place the main ("FOH") speakers in front of the microphones
(along the front edge of the stage).
If you use monitor speakers, be sure never to point any microphone directly at the monitors.
Feedback may also be triggered by resonances depending on the acoustics of the room or hall. With res-
onances at low frequencies, proximity effect may cause feedback. In this case, it is often enough to move
away from the microphone a little to stop the feedback.
1. Never let more than two persons share a microphone.
2. Ask your backing vocalists never to sing more than 35 degrees off the microphone axis.
The microphone is very insensitive to off-axis sounds. If the two vocalists were to sing into the micro-
phone from a wider angle than 35 degrees, you may end up bringing up the fader of the microphone
channel far enough to create a feedback problem.
The PB 1000 Presence Boost Adapter (installed in the HT 450/C handheld transmitter) boosts the sen-
sitivity of the microphone element by approx. 5 dB between 5 kHz and 9 kHz for optimum intelligibility of
speech.
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"V1.1": firmware version
"B 4--.50": frequency band
"PV 1.0": Preset version
AKG WMS 450 V 1.10