Production: 1978 - 1980
Designer: Jacob Jensen
Replacing the former Beovox M70, both the Beovox Uni-Phase M75 and its bigger brother, the M100, were very much top of the range speakers in their days.
Reproducing sound with studio monitor quality they were bought by keen music listeners and sound professionals alike. Special electronic circuitry was built inside to protect the drivers against speaker abuse by the use of too much power. This special overloading protection was fitted to most of the new range Beovox Uni-Phase speakers which turned themselves off if the preset power threshold had been realised. A red LED indicator lamp at the bottom of the front grille illuminated when the overload function had been triggered. A special reset button was pressed to bring the speakers back to full operation.
Offering good performance the Beovox M75 was suitable for medium-sized rooms when it could handle 75W RMS adequately. The Beovox M70/75 and M100 had the same midrange unit, a German-made ITT Schaub-Lorenz unit (LPKM/130/50 120T), classified by them as a 50mm (presumably the diameter of the voice coil) soft dome in a 130mm housing; the textile dome itself being about 55mm and about 65mm (measured) including its surround. The B&O speaker leaflet of the time lists it as a 2.5″ (6.3cm). The tweeter for the M70 was a SEAS H086 (25mm soft-dome unit), while the Beovox M75 had an Audax 25mm soft-dome unit (HD12×9D25).
Beovox M75 was provided with its own floor stand in order to set it at the correct listening height. The stand also allowed specifical forward-facing angles to be made.
Beovox M100 was the bigger brother of the M75 and was fitted with a 5-way driver system. The largest unit was a 330mm woofer. A filler driver, mid-rage unit and two tweeters completed the fivesome. The speaker could handle 100W RMS adequately and in case of too much power going through, the unit could temporarily turn itself off, thus protecting its components.
This large loudspeaker which was ideal for a good-sized room could be paired with the Beomaster 4400.
Beovox M75 was provided with its own floor stand in order to set it at the correct listening height. The stand also allowed specifical forward-facing angles to be made. Beovox M100 was only available in a rosewood finish.
The updated Beovox M100.2 models were fitted with updated drivers and the range was subsequently succeeded by Beovox MS150.
Beovox M75 Specifications
Continuous load 75 W
Music load 125 W
Impedance: 4 - 8 ohms
Frequency response +4 -8 dB 27 - 20,000 Hz
Sensitivity 5 W
Gross volume 55 litre
Phase link unit: 12,5 cm
Mid-range unit: 6cm
Dimensions W x H x D: 35 x 65 x 27cm
Beovox M100 / M100-2 Specifications Type: 6309/6319
Continuous load:100 W
Music load: 150 W
Impedance: 4 - 8 ohms
Frequency response: +4 -8 dB 27 - 22,000 Hz
Net volume: 60 litre
Gross volume: 89 litre
Filler driver: 11.5cm
Mid-range unit: 5.5cm
Tweeter 1: 4cm
Tweeter 2: 1.9cm
Dimensions W x H x D: 39.5 x 75 x 30.5cm