Microphones in the Classroom

Many classrooms have a microphone that can be used for Kaltura recordings, broadcast classes, and in some cases, in-room sound reinforcement (amplification). If a room has a microphone, it can be found in one of the following locations:

  • In a charging station on top of the instructor's desk
  • In a black drawer under the instructor's desk
  • In a charging station on a shelf in the classroom's equipment closet (Huntsman Hall)

Microphones that run off disposable batteries should have extra batteries near where the microphone is stored.

Book icon How to Use Microphones

Book icon Other Guides


Info icon  QLXD Microphones

QLXD microphones consist of a rechargeable battery pack, shown below, and either a lapel or over-the-ear microphone.

QLXD microphone

How to Operate

Turn on the microphone by toggling the power switch on top of the battery pack to "on." A green light will appear next to the switch indicating the microphone is on.

QLXD microphone power switch

The battery pack is rechargeable and should not need replacement batteries.

Proper Microphone Placement

For lapel microphones (shown below), clip the microphone 6-8 inches directly below the mouth. Placing the microphone off to the side should be avoided.

lavalier microphone

For over-the-ear microphones (shown below), place the rubber earpiece around the ear with the microphone pointed towards the mouth. The earpiece can be adjusted/molded for a better fit.

over the ear microphone

Place the battery pack in a pocket or clip it to a belt or other article of clothing. It should not be placed near a cellphone or other wireless device so as not to interfere with the signal.

After Class

Place the microphone in the charger base (shown below) before leaving to ensure it is charged and ready for the next event that may need it. Ensure the microphone is fully inserted into the charger base. When fully inserted, the microphone will click into place, and a red light underneath the battery icon will appear on the charger base. The charger base is located either on top of the instructor's desk or in the equipment closet at the back of the room.

QLXD microphone charger

While it may look nice, the microphone cable should never be tightly wrapped around the battery pack or pinched. This can damage the microphone cable and cause shorts in the wire.

Info icon SLX Microphones

SLX microphones consist of a battery pack and lapel microphone, shown below.

SLX microphone

How to Operate

Turn on the microphone by pressing the power button on top of the battery pack. The status light near the power button should turn green indicating the microphone is on.

SLX microphone power button

After turning on the microphone, wait thirty seconds and check the battery meter on the front of the battery pack. If the battery meter shows only one bar, replace the batteries. If the status light on top of the battery back is flashing or solid red, the batteries are dead and need to be replaced.

To replace the batteries, press in the tabs on either side of the battery pack and lift open the battery compartment door.

SLX microphone battery compartment

On the side of the battery back, there is a microphone level switch that should not be changed. Most microphones have tape over the switch to prevent the switch from being changed. In most cases, but not all, it should be set to "mic."

Proper Microphone Placement

Clip the microphone on an article of clothing 6-8 inches directly below the mouth. Placing the microphone off to the side should be avoided.

Place the battery pack in a pocket or clip it to a belt or other article of clothing. It should not be placed near a cellphone or other wireless device so as not to interfere with the signal.

After Class

Place the microphone back in the drawer below the desk at the end of class so that the next class can easily find the microphone. While it may look nice, the microphone cable should never be tightly wrapped around the battery pack. This can damage the microphone cable and cause shorts in the cable.

Info icon RevoLabs Microphones

Revolab microphones are simple USB microphones that consist of a wireless microphone, shown below, and the charger base.

Revolabs microphone

How to Operate

Remove the microphone from its charger. The microphone should already be powered on but will most likely be muted. Unmute the microphone by pressing the mute button on the front of the microphone.

Revolabs mute button

A green light will flash on the top of the microphone indicating the microphone is on and unmuted. If a flashing red light is visible, the microphone is muted.

The microphone is rechargeable and should not need replacement batteries.

Proper Microphone Placement

Clip the microphone to a piece of clothing 6-12 inches directly below the mouth or hang the microphone around the neck using the included lanyard. Placing the microphone off to the side should be avoided. The top of the microphone should be pointed up toward the mouth.

After Class

Place the microphone in the charger base (shown below) before leaving to ensure it is charged and ready for the next event that may need it. Ensure the microphone is fully inserted into the charger base. The charger base will be either on top of the instructor's desk or in the drawer in one of the cupboards below the instructor's desk.

Revolabs charging station

Info icon Ceiling Microphones

Ceiling microphones are found in most IVC (broadcast) classrooms. They are used to capture audio from the students/audience in a room. The ceiling microphones can also be used to record student/audience participation in Panopto.

Most ceiling microphones look like the one in the image below.

ceiling microphone

How to Operate

Mute and unmute the ceiling microphone from the Classroom Touch Panel.

  1. In the upper right of the Crestron touch panel, select "Teach IVC" or "Video Conference." You'll see two mute buttons in the middle of the screen: an "All" mute button and a "Student" or "Ceiling" mute button.
  2. Press the "Student" or "Ceiling" mute button to mute and unmute the ceiling microphones in the room. When the button is solid or flashing red, the ceiling microphones are muted. When green, the microphones are on.

The ceiling microphone mute buttons can be seen in the two following Crestron Touch Panel screenshots:

location of ceiling mute button on first version of touch panel

location of ceiling mute button on second version of touch panel

After Class

Mute the ceiling microphones before leaving the room.

Additional Information:

  • For the best audio quality, instructors and presenters should use the wireless microphone to record their voice and only turn on the ceiling microphones when needed. Ceiling microphones will pick up just about every noise in the room, including shuffling papers and keyboard typing.
  • While ceiling microphones are great at picking up most voices, soft-spoken individuals may need to speak up to be heard over the ceiling microphones.
  • Ceiling microphones cannot be used for in-room sound reinforcement (audio amplification).

Info icon Set Up Sound Reinforcement

Sound reinforcement amplifies a person's voice in a large room or space. It is only available in larger classrooms.

How to Set Up

First, turn on the wireless microphone and put it in position, then follow the instructions below to properly set up sound reinforcement.

On the Classroom Touch Panel:

  1. Select the "Mics" button in the lower right or lower middle of the Crestron touch panel. This will display the audio level for the sound reinforcement.
  2. Turn the sound reinforcement level down to about 25%.
  3. Start counting or speaking into the microphone.
  4. While speaking into the microphone, slowly turn up the sound reinforcement volume until you can just barely hear the sound reinforcement.
  5. That's it!

Following the above instructions should ensure the sound reinforcement is set to the correct level and will prevent feedback.

SCCE and HH Instructions

Turn on sound reinforcement in supported SCCE and HH classrooms by pressing the mic icon in the lower middle of the Crestron Touch Panel next to the room volume controls. When the mic icon is green or blue, sound reinforcement is on.

After Class

Return the microphone to the charger base or the drawer under the instructor's desk.

Additional Information

In rooms with lapel microphones, place the mic 6-8 inches directly below the mouth.


question mark icon FAQ

Do all classrooms with a microphone have sound reinforcement?

No. Small to mid-size classrooms do not have in-room sound reinforcement (audio amplification). Most large classrooms will have sound reinforcement.

What do I do if the batteries are dead and I can't find extra batteries?

Contact us and we'll run some over immediately.