Aiphone IMU-100 - Controller and Operation Station Kit for IM System

The run from the speaker driver to the control unit calls for 2 x 2-conductor cable with an overall shield, Aiphone #822202 or #821802, at up to 66 feet in 22AWG or 18AWG. Unshielded cable is the usual cause of hum and VOX false-keying on these systems, so an existing unshielded pair is not a substitute. The desk station itself connects to the MU-100 with the connector supplied in the kit, up to 6 feet.

Either one. The IMU-100 station supports hands-free VOX operation and push-to-talk simplex, with a VOX sensitivity adjustment and a VOX operation LED so the operator can see when the station is transmitting. There is also an ambient noise cancelling control, which is what you want at a lobby desk or a noisy loading area where VOX would otherwise key open on background noise.

No, and this is the most common mix-up. The IMU-100 is an audio intercom controller and operation station kit for the Aiphone IM system: it lets a person at a desk talk to someone at an entrance. It is not a credential-based access control unit. If what you need is standalone entry control at the door itself, that is a different product type, for example the Codelocks A3 Dual standalone door controller with RFID. Some sites run both, an intercom for screening visitors and a reader for staff entry.

No - the two units do different jobs at the door. The Aiphone IMU-100 is the control unit and desk operation station for an IM audio intercom: it handles two-way voice as hands-free VOX or push-to-talk simplex, has transmit, speaker, receive and standby volume control plus ambient noise cancelling, and wires to a speaker driver at up to 66 feet using 2 x 2-conductor overall shielded cable. The Codelocks A3 is a standalone door controller with RFID, which reads a credential presented at the door rather than passing voice between a visitor and an attended desk. A site that wants a person at a counter to hear and speak to a caller needs the intercom control unit; a site that wants a card or fob to release the door needs the RFID controller. Buildings frequently install both.

Both work. The IMU-100 station is built for desk mounting and ships with a bracket for mounting it under a counter, which is the usual choice at a reception or guard desk where the counter surface has to stay clear.

Yes on both counts. The station takes a standard 3.5mm headset plug (rated input 40mW or more, maximum input 100mW or more, 32 ohm impedance), and there is a socket for an optional gooseneck microphone. The gooseneck mic is ordered separately.

The temperature rating is 14 to 140 degrees F (-10 to 60 degrees C), so an unconditioned booth or vestibule is within range in most climates. It is a commercial-rated product, not a residential one.

For an opening where the goal is letting known holders in on their own, without an attendant answering, the Codelocks A3 dual standalone door controller with RFID is the type of device that fits - it operates as a standalone controller and reads RFID credentials at the door. The Aiphone IMU-100 is built for the other pattern: it is the controller and desk-mounted operation station for an IM audio intercom, sitting on or under a counter with the supplied bracket, up to 6 feet from the MU-100 on its supplied connector, so a staffed position can screen and answer a caller by voice. Choose by who grants entry - a credential the visitor already carries, or a person at the desk.

Transmit output is 3W into 4 ohms and receive output is 1.5W into 16 ohms, with separate volume controls for transmit, speaker, receive and standby plus a hi/lo volume switch. That hi/lo switch is the practical control: set it low for a quiet after-hours lobby and high when the space is busy, without re-trimming the individual level controls.