In AKG terminology, the 'C' prefix in the model number denotes a microphone with a condenser transducer, while the 'B' suffix refers to the integrated bass‑cut filter. An integral wind and pop screen is provided, and the C4000B package is completed by a 'spider suspension' shockmount and a large expanded‑foam windshield. Switches on the mic's body provide three polar patterns (omni, cardioid and hypercardioid), a 10dB pad (giving the mic a very high SPL - Sound Pressure Level - capability), and a bass‑cut filter. It requires phantom powering of between 9 and 52 Volts for the head‑amp. The new mic features an internal preamplifier claimed to offer high sensitivity, low self‑noise, and a very wide dynamic range. (See ' Electret Or Capacitor?' box later for more on the differences between the two types of capsule.) Apparently the capsule used in the C4000B is a more elaborate, dual‑diaphragm, variant of that used in AKG's SolidTube (reviewed in SOS January 1998), but with a solid‑state preamplifier in place of the SolidTube's valve circuitry.Īimed primarily at home and project studios, the side‑firing C4000B is reasonably priced, rugged and flexible, and is intended to serve equally well in the studio or on stage. All previous multi‑pattern mics have used true capacitor capsules, but recent technological advances have enabled AKG to build multi‑pattern facilities into a more cost‑effective electret design. I say "unique" because this is claimed to be the first microphone in the world to provide a multi‑pattern polar response using a dual‑diaphragm electret capsule. Hugh Robjohns lends an ear to AKG's affordable new C4000B, the first dual‑diaphragm, multi‑pattern mic with an electret capsule.ĪKG have over 50 years of experience in the design and manufacture of high‑quality microphones, the unique large‑diaphragm C4000B being their latest offering. The mic was released in 2009.Multi‑pattern microphones traditionally have true capacitor capsules and are correspondingly relatively expensive - until now. The AKG Acoustics Perception 820 Tube is also known as: 820 Tube, Perception 820, 820. The “Perception 820” branding was retired in 2014, although the same microphone was simultaneously (re)introduced as the “P820 Tube,” within AKG’s revamped collection of project studio microphones. Manufacturing is done in China, under AKG’s “strict quality control.” The 820 Tube kit contains the microphone, the “remote control” aka power supply, a 7-pin mic/power cable, an elastic shock mount, PSU power cable, and padded metal flight case.ĪKG’s Perception microphones were designed by AKG in Vienna. The grille is fashioned from stainless steel wire. The mic’s body is tooled from zinc/aluminum alloy. The tube-and-transformer circuit is said to “emphasize even-order harmonics for rich, smooth and three-dimensional sound.” The tube in the amp circuit is an ECC83 (12AX7 type) dual triode of unknown (but likely Chinese) origin. A switch on the rear panel enables a ground lift, useful for eliminating hum from ground loops in sketchy home/studio wiring. Front-panels switches enable the high-pass filter (-12dB/octave 80Hz) and -20dB pad. The external power supply unit, dubbed the “remote control,” provides access to 9 polar patterns - from omni to cardioid (with three unnamed wide-cardioid patterns in between), and from cardioid to figure-8 (with three unnamed supercardioid patterns in between). The amplifier circuit is built using discrete, through-hole components. The Perception 220, 420, 820, 100, 200 and 400 share the same capsule platform which is is one-inch, center-terminated and true condenser. It is the only tube microphone in AKG’s “Perception” line of project studio microphones. AKG Acoustics Perception 820 Tube Multi-Pattern Tube Condenser MicrophoneĪKG’s Perception 820 Tube large-diaphragm, multipattern tube design with transformer-coupled output.
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