Azden infrared wireless microphone system for classroom

Components
IRR-30P RECEIVER
The heart of the Azden infrared system is the IRR-30P powered, dual-channel receiver. It allows you to use and control the volume of 2 wireless microphones simultaneously, either for "team-teaching, or to use the handheld microphone for student pass-around. The receiver also has 2 stereo auxiliary inputs so that other line-level devices (CD players, MP3 players, VCRs, etc.)can be attached and played through the system. The teacher can also send the audio to   a recorder or video camera, using the line-level preamp-level jack. For bigger rooms orodd-shaped rooms up to 3 additional external sensors can be attached. With all 4 of the
ceiling speakers attached to the IRR-30P, sound is spread equally throughout the room,
allowing all students to hear equally.
IRN-10 MICROPHONE
A lightweight, chest worn, microphone/transmitter , it comes with an adjustable lanyard. It is both a microphone and infrared
transmitter which wirelessly "links" the teacher to the IRR-30P receiver. It has a specially designed internal microphone array
which provides great sound pick-up. With two switchable channels, a teacher can go from classroom to classroom with the same microphone! W ith just two "AA" batteries (alkaline or rechargeable) the microphone can be used the entire school day without
recharging or changing batteries.
IRH-15c HANDHELD MICROPHONE
The perfect handheld "pass-around" microphone for student participation, this dual channel microphone/transmitter , operates on the channel that the teacher is not using. It is powered by two "AA" batteries (alkaline or rechargeable) and is compatible with all Azden infrared models.Both the IRN-10 and IRH-15c can recharge internal NiMH batteries when a BC-29 wall-charger is used. There's no need to remove the batteries to recharge.
IRD-60 SENSOR
In most classroom situations, a single wellpositioned IRD-60 external IR sensor provides complete classroom coverage. Mounting is easy
and the sensor is connected to the IRR-30P ,receiver with standard coaxial wire.
Recommended Speakers
To get the maximum power of IRR-30P, ceiling or wall speaker adapted impedance 4 ohm, passive type one is recommended to connect with IRR-30P.

SPECIFICATIONS
IRR-30P 2-channel receiver w/power amplifier                    IRN-10 2-channel chest-worn transmitter
Sub-carrier frequencies        2.06MHz & 2.56MHz                                          Sub-carrier frequencies        2.06MHz & 2.56MHz switchable
Type                                    Super heterodyne - crystal controlled                 Modulation                          FM
Modulation                          FM                                                                      Microphone element type   Uni-directional electret x 2
Signal-to-Noise                    >75dB A weighted                                              Frequency response             50-9KHz ±3dB
Reception sensitivity            >25db/V                                                              Ext. Mic input impedance   2.2k ohms
Line Input impedance         32K ohms ±15%                                                  Ext. Mic input jack               φ3.5mm
Line Output adjustment         -∞ ~ +10dBu                                                     Ext. Mic Voltage/Our rent    3.5VDC@ 1mA (to power electret
Audio Output                       5W x 4 @ 4 ohms                                                 mic element)
Power requirement              15VDC @ 2.7A(use model BC-30)                       Mic gain adjustment            +6dB~ －10dB
Size                                     8.03''W x 9.19'' D x 1.73'' H (204 x 233 x 44mm)  Battery type     2-"AA" alkaline (1.5V x 2)
Weight                               2.86lb(1.3kg)                                                                                2-"AA" rechargeable NiMH (1.2V x 2)
                                                                                                                         Battery life        > 8 hours w/alkaline batteries
                                                                                                                         Size 3               15" H x 2.75" W x 1.06" D (80 x 70 x 27mm)
                                                                                                                         Weight            4.3oz (120g) w/alkaline batteries   
                   

IRH-15C 2-channel handheld transmitter                                  IRD-60 Dome sensor      
Sub-carrier frequencies        2.06MHz & 2.56MHz switchable                           Output                       F Connector
Modulation                          FM                                                                        Power                       powered by receiver (24V @ 15mA)

Microphone element type   Uni-directional dynamic                                        Cable requirement      RG59 - 75 ohm coaxial

Frequency Response           50-8KHz ±3dB                                                       Size                            3.94" x 1.18" (100 x 30mm)

Battery type                        2-"AA" alkaline( 1.5V x 2 )                                     Weight                       6.00oz (170g) w/mounting bracket

                                           2-"AA" rechargeable NiMH (1.2V x 2 )
Battery life                          > 6 hours w/alkaline batteries
Size                                    9.65''x ~1.375" (245 x ~35mm)
Weight                                9.1oz(258g) w/alkaline batteries

Specifications will change without prior notice due to improvement.

This system consists of these components