Beomic BM3

Product : Beomic BM3

Produced from : 1962 - 1966
Designed by : Erik Rorbaek Madsen
Finish : Stainless Steel
Desirability : 4

The Beomic BM3 and Beomic BM4 from Bang & Olufsen were pressure-gradient full-bass ribbon microphones. They were shock- and blast-proof and included ball-swivel tilting to any position.

Beomic BM3

BeoMic BM3 details:

Impedance: 50 ohms balanced

Response M position: 20-11000 c/s +/- 2,5 dB

T position: 10 dB lower at 100 c/s

Sensitivity M position: 50 ohms: 88 dB below 1V/µbar

T position: 4 dB lower

Dimensions: 195mm high x 30mm diameter

BM3

Below: Beomic BM3 with Beocord Unitape 512K:
Beomic BM3
Details:
Dimensions 195 mm high, 30 mm diameter
Impedance 50 ohms balanced
Response M position: 20-11000 c/s +/- 2,5 dB
T position: 10 dB lower at 100 c/s
Sensitivity M position, 50 ohms: 88 dB below 1V/µbar
T position: 4 dB lower

Response Frequency characteristics:

M (Music) Position: From 20 till 11,000 c/s +/- 3 dB

T (Close Talk) Position (8-16″) Rolled off below 100 c/s: 12 dB

RTMA Microphone Rating GM (sensitivity): -158dB; Hum Sensitivity (RTMA) GH: -145 dB

RTMA Standard SE - 105. BM 3. Open Circuit Voltage Level: -88 dB, OdB = 1 Volt per Microbar

Output Impedance: Nominal 80 ohms

Rating Impedance: 150 ohms

BM 4. Open Circuit Voltage Level:

“L”-Position: -88 dB

“M—Position: -81dB

“H”-Position: -60 dB

OdB = 1 Volt per Microbar

Output Impedance:

“L”-Position:

Nominal at 1000 c/s; 100 ohms

Rating Impedance: 150 ohms

“M”-Position:

Nominal at 1000 c/s; 450 ohms

“H” position:

Nominal at 1000 c/s; 60 k ohms

Rating impedance: 40 k ohms

Weight: 38g

Cable: supplied with 20 feet twin cond. shld.

Transformer type: 8016-JS for matching BM3 to a high impedance amplifier input available on special order

Mounting: Bayonette detach to 5/8″ x 27 thread

(Taken from BM 3 specifications’ sheet)

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