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What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.



H.H. Scott '59





B&W DM-6

 Bowers & Wilkins DM6 (1975 - 1979)
Floor-standing loudspeaker system
Product Summary
Early in 1972 it was decided to fill the gap in the existing range of B&W loudspeakers between the already successful DM2A and the DM70. Initially this was a fairly straightforward commercial requirement but as the development programme progressed its scope widened into the development of new measuring techniques and the use of new materials.
It culminated in the production of what is probably the first British Loudspeaker System to take account of relative phase between the drive units and offering a transducer that has a substantially minimum phase characteristic throughout the audio spectrum, with the resultant improvement in the reproduction of all transient information.


 Technical highlights
The DM6 Bass unit operated in an enclosure volume between 51-60 litres providing a system resonance below 50 Hz.
The Midrange Unit crosses over from the Bass unit at 500 Hz and operates up to the point of crossover by the HF unit which was estimated around 6 kHz. In view of the crossover frequencies chosen it was necessary for this unit to have a substantially linear response from well below 100 kHz to some 10 kHz.
To compliment the other two units and carry the frequency response well above 20 kHz. It was also felt desirable that unit should have really wide dispersion and that its diameter should be as small as possible consistent with the power handling required.



Specifications
Type:  3-way floorstanding loudspeaker with stand
Drive Units:
1 x TW 20 high frequency unit voice coil diameter 19 mm
1 x 131 mm midrange unit MW 150 voice coil diameter 37 mm
1 x 224 mm low frequency woofer
Frequency Response:   50 Hz to 20 kHz, ±3 dB, 3 metres on axis
Crossover Frequency:  500 Hz, 5,000 Hz
Sensitivity:  95 dB at 1 metre
Nominal Impedance:  8 ohms
Power Handling:  25 W – 350 W
Dimensions:
Height : 931mm (including stand)
Width : 410mm
Depth : 380mm
Weight:  36,1 kg

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