AKG PZM11LL - Security Microphone

AKG PZM11 LL - Boundary/PZM security microphone with line-level output

The AKG PZM11 LL is a pressure zone/boundary layer (PZM) microphone designed for security and surveillance , intercoms, and conference rooms. Its flush- mountable form factor and off-white (paintable) faceplate make it discreet, similar to a wall switch, avoiding attracting attention. It offers a hemispherical pickup pattern to clearly capture anyone standing directly opposite the wall/ceiling where it is mounted, with low-cut to minimize HVAC noise and a slight treble boost to improve speech articulation. Unlike the PZM11 (mic-level) version, the PZM11 LL delivers a balanced line-level signal , allowing for long runs and direct connection to line inputs without a pre-mic.

Main features

• PZM/boundary design with hemispherical pattern for uniform speech pickup on surfaces.
• Balanced line-level output (high) for direct connection to line inputs and recorders.
• Standard power supply : 24 V AC or 12–24 V DC on terminal block. 12–48 V phantom power option via factory/board modification (version PZM11LLS2 or documented internal adjustment).
• Flush mounting in an electrical box and connection by screw terminals (1 ground, 2 hot, 3 cold), without additional connectors.
• Voice-optimized response : 80–20,000 Hz with bass roll-off and gentle treble boost for greater intelligibility.
• Discreet off-white finish , paintable to integrate into the installation.

Product benefits

• Maximum discretion in security environments: wall plate appearance, difficult to detect.
• Speech clarity thanks to bass control (air conditioning noise) and treble presence.
• Professional installation : screw terminals, standard box mounting and balanced wiring for long runs without hum .
• Easy integration with recording/monitoring systems by delivering line level .

Use cases

• Ticketing and counters (ticketing, banks, administration).
• Surveillance and security in interview rooms, entrances, and sensitive areas.
• Intercom and conference rooms requiring a recessed and discreet microphone.

Frequently Asked Questions

How is it different from the “plain old” PZM11?
The PZM11 delivers microphone level and is powered by 12–48 V phantom power . The PZM11 LL delivers line level and is powered by 24 V AC or 12–24 V DC (phantom power possible only with specific modification/manufacturing).

Is it suitable for outdoors?
For outdoor use or areas exposed to rain, use the PZM11 LL WR (weatherproof version). The standard PZM11 LL is for indoor use.

Can the plate be painted?
Yes, the finish is off-white and paintable (previously sealing the gap between the capsule and the plate, as recommended by the manufacturer).

Description for projects

AKG PZM11 LL boundary/PZM flush-mount security microphone; hemispherical pattern ; 80–20,000 Hz response ; balanced line-level output ; 75 Ω impedance ; 1.4 V/Pa sensitivity ; S/N 68 dB(A) ; self-noise 26 dB(A) ; max. SPL 100 dB (3 % THD) ; 24 V AC or 12–24 V DC power supply (12–48 V phantom power via modification); 1-ground/2-hot/3-cold terminal block connection ; paintable off-white finish ; weight 71 g .