AKG PCC130 Compact Half-Cardioid Boundary Layer Conference Microphone

AKG PCC130: Compact Half-Cardioid Boundary Microphone for Meeting Tables

The AKG PCC130 is a half-cardioid boundary layer microphone built for conference tables, video-conferencing rooms and narrow lectern tops, covering 50 Hz to 20,000 Hz at 22 mV/Pa sensitivity. Its housing is deliberately smaller than the full-size plate microphone in the same family, which is the reason most buyers choose it: a boardroom table stays uncluttered and a camera frame stays clean while the audio performance is unchanged. Boundary layer, also called surface mount, means the capsule is held at the mounting plane rather than above it, a placement that makes the surface work for the microphone instead of against it. A 22 dB-A noise floor and a 120 dB SPL ceiling at 3 percent THD cover both a quiet participant at the far end of a table and a knock on the table right beside it. It is the discreet, low-profile choice for rooms where the meeting matters and the microphone should not.

Half-Cardioid Coverage for Two or Three Talkers per Position

Pickup is half-cardioid, behaving as a cardioid in the hemisphere above the mounting surface and hearing nothing from below it. Cardioid is a broader pattern than the supercardioid used on the larger sibling model, and that wider forward lobe is exactly what a shared table position needs, because two or three participants seated around one microphone all fall inside the coverage instead of only the person directly in front of it. Fewer microphones per table follows from that, which reduces channel count, reduces the number of open microphones adding room noise into the mix, and simplifies gating in the DSP. A boardroom seating twelve, a training table, or a council dais can therefore be covered with a handful of units rather than one per chair, and the automixer has less work to do.

Same Electroacoustics in a Physically Smaller Body

Electroacoustic performance is identical to the larger plate microphone in the family: 22 mV/Pa sensitivity, a 22 dB-A equivalent noise level, a 72 dB signal-to-noise ratio at 94 dB SPL and 120 dB SPL maximum level at 3 percent THD. The manufacturer states this outright in the product manual, and the difference between the two models comes down to physical size and polar pattern rather than any compromise in the capsule or the electronics. That matters to a specifier because the smaller footprint is a free choice, not a trade-off, and owners confirm the speech pickup quality matches the larger model despite the reduced housing. For a facility standardizing across rooms, the pair can be mixed freely, with the compact model on tables and the larger one on stage floors, without any change in tonal character between rooms.

Boundary Mounting, Explained

Boundary-layer mounting works because it eliminates the time gap between two arrivals of the same sound. Sound reaching a microphone near a table or wall arrives twice, once directly and once reflected off the surface, and when the diaphragm sits some distance above that surface the reflection is delayed just enough to cancel the direct signal at a comb-like series of frequencies, which is why a stand-mounted microphone lying near a hard tabletop can sound thin and hollow. Placing the diaphragm level with the surface reduces that delay to almost nothing, so the two arrivals sum in phase, raising effective sensitivity and keeping the response smooth across the band. In practice a video-conferencing room gains cleaner, more natural voices at the far end, and an AV designer no longer has to fight the very table the microphones sit on.

Bass Control, Powering and Termination

Low-frequency control comes from a slide switch offering bass cut, flat, or bass boost, and in a meeting room the cut position earns its keep immediately. Surface-mounted microphones are mechanically coupled to the furniture, so a laptop set down hard, a pen tapped on the table, or air handling under the floor all arrive as low-frequency energy, and trimming that region at the microphone keeps it out of the DSP and off the recording. Powering is a wide 12 to 48 V phantom window at 4 mA nominal drain into a balanced 150 ohm output, so a small installed mixer, a conferencing DSP, or a full-size console can all feed it, and a PH1A or PH4B supply covers inputs with no phantom at all. Termination is a 3-pin locking mini connector at the microphone with a supplied 15 ft (4.6 m) shielded cable ending in a standard 3-pin male XLR, which integrators value in retrofits because the cable length can change without the microphone being replaced.

Sightlines, Switched Versions and Typical Rooms

Sightlines are the quiet advantage of a low-profile plate microphone in any room with a camera in it, since nothing tall sits between a participant and the lens. Video conferencing, lecture capture and streamed panel discussions all benefit from that, and it is a frequent reason buyers pick this model over a taller gooseneck or a stand-mounted microphone in the same position; a PCC130 SW version exists in the same family for installations that need a local mute at each seat, with a silent programmable membrane switch and an LED. Boardrooms and conference tables, video-conferencing rooms, lecterns and pulpits with limited surface area, council chambers, courtrooms and hearing rooms, distance-learning desks, broadcast panel tables, school theatre floors and choir risers are all standard positions for it. Integrators report it holding up well in daily-use conference rooms, which is what a permanently installed microphone is ultimately judged on.