AKG PCC130 SW Half-Cardioid Boundary Microphone with Silent Switch and LED

AKG PCC130 SW: Per-Position Muting Without a Click in the Mix

The AKG PCC130 SW is a half-cardioid boundary layer microphone with a silent-operating programmable membrane switch, built for small conference tables where each talker controls their own position. Its acoustic engine is the compact Phase Coherent Cardioid design, delivering 22 mV/Pa sensitivity, 22 dB-A self-noise and a 50 Hz to 20,000 Hz response measured at 30 degrees incidence to the surface, but the switch is why this particular part number exists. A high-intensity LED in the housing lights whenever the microphone is live, so a participant knows their own state without looking at an operator. For any room where control has to sit with the person speaking rather than with a technician, that combination is the whole specification.

Why a Mechanical Switch Is the Wrong Tool

Switching a live microphone channel is an electrical event, and an ordinary mechanical switch makes that event audible. Metal contacts closing physically bounce for a few milliseconds, and each bounce produces a step change in the DC conditions at the microphone output which the console preamplifier faithfully amplifies into a click or a thump; on a reinforced system feeding loudspeakers in the same room, that transient is loud, startling and impossible to disguise. A membrane switch works differently, using a sealed pressure-sensitive pad to signal the microphone's own internal electronics rather than physically interrupting the audio path, so the transition happens in a controlled way with nothing for a preamplifier to interpret as signal. AKG describes the result plainly as silent operation, and in a council chamber or a courtroom that difference is what makes per-position muting acceptable at all.

Three Programmable Modes and the Room Each One Fits

Configurability is what lets one part number serve rooms with completely different etiquette. Touch on/off is a latching mode where a single press opens the microphone and a second press closes it, which suits a boardroom where participants speak at length and expect the microphone to stay where they left it. Momentary on is push-to-talk, holding the channel open only while the pad is held, and it is the correct choice for a busy debate or a radio-style discussion where any unattended open microphone becomes a problem. Momentary off is the mirror image, a cough switch that closes an otherwise-live microphone for as long as it is held, which is how broadcast desks and panel positions normally work. Choosing the mode at installation rather than at manufacture means a room can be re-purposed without changing microphones.

The Reflection Problem a Boundary Microphone Removes

Placing a conventional microphone on a short stand above a table creates a specific and audible defect. Sound reaches the capsule twice, once directly and once as a reflection off the table surface a few inches below, and because the reflected path is slightly longer it arrives slightly later; at frequencies where that delay equals half a wavelength the two arrivals cancel, producing a series of deep notches through the speech band known as comb filtering, which is what makes a stand-mounted table microphone sound hollow. Mounting the capsule directly in the boundary layer of the surface eliminates the delay entirely, because at that position the direct and reflected sound are effectively coincident and sum in phase instead of fighting. The audible result is the smooth, natural response that made this microphone family a standard for tables and lecterns, plus a useful gain in sensitivity from the in-phase summation.

Bass Tilt, Powering and Cable Service

Practical installation detail is where a conference microphone earns or loses its keep over years of use. A three-position bass-tilt switch offers FLAT, CUT and BOOST settings, so a technician can strip subsonic energy out of a table sitting on a hollow raised floor, leave the response alone in a well-behaved room, or add weight for a talker whose voice sits thin in the system. Powering is standard 12 to 48 V phantom at 4 mA nominal, which means any console, stage box or room processor channel can run the microphone with no local supply, and the 150 ohm nominal balanced output drives long building runs without difficulty. The 15 ft (4.6 m) two-conductor shielded cable is detachable at a 3-pin locking mini connector on the microphone and terminates in a 3-pin XLR male, so a damaged lead is replaced without disturbing a microphone that may be permanently fixed to a table.

Rooms That Ask for a Switched Compact Boundary Microphone

Buyers arrive at this model when a table is too small for a larger housing and the room's operating model puts control in each participant's hands. Small meeting rooms and huddle spaces with two or three talkers per position, courtroom counsel tables, council chambers, distance-learning classrooms and broadcast interview desks all fit that description, and each of them benefits from the LED as much as from the silent switch. Integrators also specify the switched version when a room has no dedicated operator at all, since a participant who can mute themselves cleanly is far less disruptive than one who covers the microphone with a hand. Ordered with a phantom-powered channel already available, it drops into a room as a complete talker-controlled position.