InFocus IN3900 Playing sound through the projector, About the microphone input, Signal, Parameter

Playing sound through the projector

This projector is equipped with a 20-watt stereo speaker system, a dedicated microphone input, and advanced audio processing for superb audio performance.

External amplified speakers may also be connected using the audio-out connector on the projector.

This system has assignable audio. Audio 1, Audio 2 and/or the microphone can be assigned in any combination through the Audio Inputs feature described on page 33. NOTE: The microphone audio can be used alone (with other audio muted), or in conjunction with other audio simultaneously. The mixing of the microphone audio and other audio inputs is handled through the Mic Volume menu.

By default, Audio 1 plus microphone is associated with VGA 1 and VGA 2. Audio 2 plus microphone is associated with the Composite Video.

About the microphone input

•	If you wish to use a microphone, connect a 3.5 mini jack cable Dynamic
	Microphone to the projector.
•	You can use a wireless microphone as long as a wireless module is attached to
	the projector’s microphone input jack and it works well with the associated
	devices. To ensure a quality use of the wireless microphone, it is recommended
	that your microphone conforms to the specifications listed in the table below.
		Signal	Parameter	Min	Max
		Microphone	Transducer Principle			Dynamic
			Impedance	300	1K	ohm
			Frequency response	600	16k	Hz

• There are two ways to adjust the microphone volume.

• Adjust the microphone volume level in the Setup > Mic Volume menu.

• Press the Volume key on the keypad or remote to adjust the volume of the projector speaker and audio-out signal.

• The microphone will work regardless of whether the projector is turned on or soft-powered off, if the Always-On function “Microphone” is set to On.

• If the microphone is not working, check the volume setting and cable connection.

You might get feedback noise from the microphone when you are too close to the speaker of the projector. Move the microphone away from the speaker of the projector. The greater volume you require, the greater distance you need to be away from the speaker to prevent feedback noise.

NOTE: Only Dynamic Microphones should be used. Do not use active (phantom- powered) microphones as projector damage may occur.

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