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BG 20 - 8 Ohm

Art. No. 3020

20 cm (8") full-range speaker with tweeter dome. High efficiency. Suitable for full-range units as vocal or guitar monitors or as a mid-range unit for full-scale or musicians' PA systems.

Typical applications

  • Midrange unit for full scale or musicians' PA systems
  • Vocal or guitar monitors
  • Fullrange speaker for electronic organs and keyboards
*Gross price for private customers. Industrial prices are available on request.
Technical Data
Sketch
Recommended cabinets
Amplitude & Impendance Frequency
Directivity pattern
Rated power 40 W
Maximum power 70 W
Nominal impedance Z 8 Ohm
Frequency response fu–18000 Hz
(fu: Lower cut-off frequency depending on cabinet) .
Mean sound pressure level 92 dB (1 W/1 m)
Opening angle (-6 dB) 45°/4000 Hz
Excursion limit +/−6 mm
Resonance frequency fs 38 Hz
Magnetic induction 1.2 T
Magnetic flux 380 µWb
Height of front pole-plate 4 mm
Voice coil diameter 25 mm
Height of winding 8 mm
Cutout diameter 184 mm
Net weight 1.3 kg
D.C. resistance Rdc 6.2 Ohm
Mechanical Q factor Qms 3.47
Electrical Q factor Qes 0.51
Total Q factor Qts 0.44
Equivalent volume Vas 110 l
Effective piston area Sd 214 cm²
Dynamically moved mass Mms 10 g
Force factor Bxl 6.1 Tm
Inductance of the voice coil L 0.8 mH
Connections 4.8 x 0.8 mm (+)/2.8 x 0.8 mm (-)
Temperature range –25 ... 70 °C
Volume/Principle BR-Channel fb fc/QTC
30 l/closed - - 82 Hz/0,96
30 l/bass reflex BR 15.34 42 Hz -
50 l/bass reflex BR 15.34 (length 7 cm) 42 Hz -

Used in / Accessories:

MB 208/H

The MB 208/H is a compact, high-output speaker. It is equipped with two high-efficiency 20 cm fullrange BG 20 - 8 Ohm 's, working in parallel, and the HTH 8.7 - 8 Ohm tweeter. Apart from being ideal as a monitor speaker for vocals and instruments, in smallish to medium-sized rooms, it is also a good candidate for combining with a good subwoofer (e.g. MB 115/B ) for larger PA events.

As a result of the d Appolito arrangement, less sound is dissipated upwards and downwards. This directional advantage reduces the amount of ceiling and floor reflection in large halls, and will result in better voice transmission and less tendency to feedback. The sound quality of the MB 208/H is extremely high. The sound imbalance often experienced with musicians systems is missing here. In conjunction with the MB 115/B, there is no reason why hi-fi sound quality should not be achieved.

The compact design makes it ideal for transport.

Art. No. 5931

PENTATON BB


Full-range loudspeakers are enjoying another comeback and arousing increased interest, embodying, as they do, everything that a point soundsource should be. Large full-range loudspeakers like the B 200 - 6 Ohmhave the additional characteristic of transmitting the sound in a tightly bundled beam, which produces a very tangible, three-dimensional effect and allows individual instruments to be easily located. A drawback of the system, however, is that this beaming process and the sensitivity are reduced at lower frequencies. The PENTATON BB was developed specifically as a cabinet based on the legendary B 200 - 6 Ohm but designed to compensate for these two disadvantages.

In a similar way to the QUADRO, additional full-range drivers are switched in to supplement the central driver, which is connected direct to the amplifier without an intervening filter, as the frequencies go down the scale. This allows the B 200 - 6 Ohm to develop its full potential with none of the impairments caused by frequency-dependent signal-carrying components, while the BG 20 - 8 Ohms, that are optimised for low-frequency response, maintain the extremely high sensitivity and beaming effect right down to the bass range. The additional full-range drivers are arranged symmetrically in two groups around the main speaker, which again creates an acoustic focus in the centre of the speaker cabinet. On top of this, the baffles in enclosures 2 and 4 and in enclosures 1 and 5 are angled inwards by 6° and 12° respectively. This feature guarantees that, assuming a typical listening distance of approx. 3 m, each of the drivers is exactly the same distance away from the ear and at the same angle. Given the size of these speaker cabinets, this is the only way to ensure that the phases of all the drivers are in sync across the entire frequency range.

The result of all these characteristics taken together is a sound image of the stage that could hardly be clearer or more precise. Even baritone male voices and large instruments such as the double bass or bassoon appear to be present full-size, in the right place on the virtual stage and in tangible 3D. Thanks to the enormous diaphragm area and the low moving mass, the PENTATON BB transforms dynamic jumps in the recording decisively and seamlessly into sound pressure and, with its superior handling, encourages the listener to increase the volume level until it is physically felt and yet it never becomes obtrusive or laboured.

And yet, this is definitely a speaker for connoisseurs of lower volumes. Even at low output levels, the overall sound quality is tangible and mature so that every tiny musical detail, however small, is projected audibly without the slightest distortion. The frequency response is remarkably linear for a loudspeaker of this kind, which is why the PENTATON BB is ideal for the authentic reproduction of every genre of music without restriction and will allow the listener to rediscover even old favourites thanks to its analytical and highly detailed approach.

Thanks to its high sensitivity and uniform impedance curve, the PENTATON BB is predestined for use in connection with high-grade tube amplifiers with relatively low output wattages.

Art. No. 5888

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