Beovox MS 150
(1981-1982) Uniphase loudspeaker, four way, 150W
Type number: 6411
The largest speaker made for the domestic market by B&O, this 102 litre behemoth was designed as part of the Beolab 8000 system. In common with the other Uniphase speakers, a wooden carcass was used with a resin front panel. The rear was also veneer finished, a feature only found on the more expensive speakers in the range. The construction also included porting to a downward facing bass reflex port which made the fitting of floor stands essential. Text copyright © Beocentral. Unauthorised reproduction prohibited.
In common with the rest of the range, the high and midrange domes were mounted in a circular cut out at the top of the resin front panel. Behind this a resin cabinet was fitted. An extensive cross over and protection circuit (which included a red LED indicator visible on the front panel) was fitted to its rear. A 2.5cm tweeter and 7.5cm phase link dome were fitted. Below this in the mid panel was the bass unit, a polypropylene 21cm unit with a foam rubber roll surround. In the lowest panel a 25cm Peerless subwoofer was fitted, again with a foam rubber surround. Three grilles were fitted to the front, all of different sizes. Text copyright © Beocentral. Unauthorised reproduction prohibited.
Beovox MS 150 was the recommended loudspeaker for the Beolab 8000 system, which could produce 150w, but only into a 4Ω load. Because the MS 150 was an 8Ω loudspeaker, “only” 100W could be delivered, though this did mean that the Beomaster 8000, given sufficient space and money, was capable of driving two pairs. Text copyright © Beocentral. Unauthorised reproduction prohibited.
A single 2 pin DIN plug was fitted to the rear in the midline and the floor stand was attached by two long Allen bolts. The speaker plug was most inconveniently placed as it made fitting and removing the DIN socket very difficult as the stand impeded access. Having said that, as the speakers weighed 30kg each, once in place it was unlikely they would be moved very often. These speakers produced a particularly flat frequency response down to below 40Hz and were only marred in later life by the poor durability exhibited by the foam roll edges of the two large bass drivers. Text copyright © Beocentral. Unauthorised reproduction prohibited.