Mic Archive
Audix MB5050
Photo: Audix, from its m1250b spec sheet, p. 1.

Audix

Audix MB5050

MicroBoom system: the M1250B miniature cardioid condenser on a 50" (1270 mm) carbon-fibre boom with gooseneck and stand clutch, for choir, theatre and orchestra

Approximate Some readings for this mic are uncertain; see the graphs.

Type
Condenser
Pattern
Cardioid
Sensitivity
−40 dBV/Pa computed
Self-noise
21 dB(A)
Max SPL
140 dB SPL
Impedance
150 Ω
Rated range
50 – 19k Hz

Frequency response

Angle
Distance

Frequency response: from the m1250b spec sheet, p. 2. Titled "Frequency response", the cardioid line (yellow) of four capsules; relative dB (axis labelled "dBm", +10 to -10). Distance, room and smoothing not stated.

Dashed: outside the rated range, or simulated (other angles and distances). Hover or tap the graphs for values.

Polar pattern

Polar pattern: from the m1250b spec sheet, p. 2. Titled "Polar patterns", the "Cardioid" plot of four; full circle, 0° at the right. Scale "dBSPL" from 0 at the outer circle to -36 at the centre. A small image (circle radius 88 px). Measuring conditions not stated. Approximate reading error up to about 1.5 dB; some frequencies are identified by reasoning, not by the legend: 250 Hz, 500 Hz, 1k Hz.

Compare with other mics

All specs

From the m1250b spec sheet
Capsule12 mm gold-vapour diaphragm, threaded modular capsule. Page 1: "12 mm gold vapor diaphragm"; the A&E spec: "a modular threaded capsule".p. 1
Sensitivity−40 dBV/Pa (10 mV/Pa), 1 kHz. Not stated by the manufacturer: Converted from "10 mV (C/HC), 11mV (O/S) / Pa @ 1k" (20·log10 0.010).p. 2
Self-noise21 dB(A). "Equivalent Noise Level 21 dB (A-weighted)".
Max SPL140 dB SPL, 0.5% THD; stated as "≥140 dB". "Maximum SPL ≥140 dB"; the A&E spec: "a maximum SPL level of ≥140 dB with THD of 0.5%".
Signal-to-noise ratio73 dB
Dynamic range119 dB
Output impedance150 ohm, at 1 kHz. "150 ohms"; the A&E spec: "nominal output impedance shall be equal to 150 ohms at 1 kHz".
Rated frequency range50 Hz to 19 kHz
Poweringphantom 18-52 V (48 V recommended). "Power Requirements 18-52 V"; Operation: "will NOT operate without phantom power voltage (48 Volts recommended)". The product page: "18 – 52 V phantom power".
Current draw6.1 mA, at 48 V
RF immunityImmune to RF interference from mobile phones and GSM devicesp. 1
MicrophoneM1250B: machined brass, black finish, 16 g, 54 × 12 mmp. 2
Use (Audix)Cardioid: area miking or group vocals at 2-3 feet; speech or single voice 8-10 inches; instruments 3-12 inches
From the spec sheet
Connectormini XLR-3 male at the foot of the boom; 7.6 m cable to XLR-3 male. "Connections: mini-XLRm (bottom), mini-XLRf (top)"; the mic has a "3 pin mini-XLRm" (M1250B sheet). Cable CBLM25: "25' shielded mic cable with mini-XLRf - XLRm connectors".p. 2
Weight94 g. Not stated for the system: boom 78 g ("Weight MicroBoom™50 78 g / 2.5 oz") plus the M1250B 16 g (its spec sheet, page 2).
Dimensions1270 × 7.4 mm. Boom length × rod diameter: "1270 mm / 50 in", "7.4 mm / .2 in". The M1250B is 54 mm long, 12 mm in diameter (its spec sheet).
Finishblack (MB5050) or white (MB5050W)p. 1
ModelsMB5050: black, M1250B cardioid. MB5050W: white. MB5050HC / MB5050WHC: M1250BHC hypercardioid. MB5055 (W, HC, WHC): M1255B high-output capsules. The same systems with 24" (MB2450...) and 84" (MB8450...) booms
BoomCarbon-fibre rod with flexible steel gooseneck; shielded cable inside; the mic plugs into a mini-XLR at the tip (push-button release)p. 2
Stand adapterMCBOOM: thumbscrew and wing-nut adjustments for angle, rotation and position of the rod
WarrantyThe MicroBoom sheet says "1 year warranty" in its features and 3 years in its warranty text; the M1250B sheet says 3 yearsp. 1
From the product page
Supplied accessoriesMCBOOM mic stand adapter (clutch); CBLM25 7.6 m (25 ft) cable; WS1218 windscreen. "The MICROBOOM System comes with a carbon fiber boom (24″, 50″ or 84″), microphone (M1250B, M1250BHC, M1255B, or M1255BHC), clutch assembly, 25′ shielded cable and windscreen." The MicroBoom sheet lists MCBOOM as supplied and CBLM25 as optional (page 2).p. 1
Price$619 (cardioid), $679 (hypercardioid), as listed on the product page on 2026-10-19

Documents

Copies kept by Mic Archive, because manufacturers move and drop their documents. Each is © Audix, unchanged, with its original address.

Product page on audixusa.com

Recommended for

Instruments whose sources name this mic, or an earlier version or variant of it.

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