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MB 212/H

For sound reproduction in large halls or in the open, you need loudspeakers with a high efficiency rating. This means that the electrical input has to be converted to sound output with the minimum possible loss. Since the mid- and high-range sound is dampened more than the bass sound as the distance from the loudspeaker increases, the frequency response of a speaker designed for this application has to rise as you move up the frequency scale. Otherwise, the speaker will sound dull at a distance.

The MB 212/H musician's P.A. system has the required characteristics and is therefore well suited to use in discos, as an outside small-volume P.A., or as a vocals and instrument speaker. The two powerful 30-cm musician's subwoofers run parallel up to around 4,000 Hz, at which point the robust, but neutral-sounding HTH 8.7 8 Ohm high-range flare takes over.

The following calculation shows how important it is to have the right efficiency rating for professional P.A. speakers: the MB 212/H speaker generates a mean sound pressure of 98 dB at 1 watt and at 1 metre from the speaker. At the maximum permanent load of 300 W, the maximum achievable at 1 metre is 123 dB. In the open, measured at 60 metres from the speaker, the level is merely 87 dB.

Suppose we were to use a normal hi-fi speaker with a high efficiency rating of 90 dB/1 W/1 m, it would take 1,900 watts (!) to achieve 87 dB at a distance of 60 metres. As you can see, no normal hi-fi speaker is in a position to achieve anything like the required compression-free sound output.

Technical Data
Component parts list
Additional Content
Rated power 300 W
Maximum power 600 W
Nominal impedance Z 4 Ohm
Übertragungsbereich (-10 dB) 60 - 17000 Hz
Mittlerer Schalldruckpegel 98 dB (1 W/1 m)
Trennfrequenz 4000 Hz
Gehäuseprinzip Bassreflex
Net volume 140 l
Außenmaß Höhe 800 mm
Außenmaß Breite 480 mm
Außenmaß Tiefe 480 mm

Bestückungsliste für 1 Box

HTH 8.7 8 Ohm
1 piece
BG 30 NG 8 Ohm
2 piece
Crossover MB 212/H
Bass reflex tube:
BR 14.70 (3 cm)
2 piece
PT 57 NG
1 piece
Damping material:
5 bags
Wood screws:
4 x 20 mm
32 piece
2 x 1,5 mm2
2,5 m

Frequency- and impedance response


Level control
LC 95
1 piece
Wood screws
4 x 20 mm
4 pieces

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