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

Tannoy Berkeley

This system provides the high power handling capacity and sensitivity of the HPD385A unit in a compact enclosure where insufficient space is available to accommodate the Arden.
A carefully designed dual ducted port reovides optimum bass characteristics in relation to enclosure volume, and the loudspeaker is front recess mounted to ensure unimpeded treble response. High desnsity stock is used throughout the cabinet construction and massive internal reinforcement renders the structure free from spurious resonances. Each section of the two-part grille can be removed separately to facilitate treble adjustment.
Integrated Drive System
The Tannoy Integrated Drive System consists of a direct  radiator bass unit and a high frequency horn-loaded compression driver both located concentrically within the same frame and magnet assembly, this is why it is known as the dual concentric system.
Bass Unit
This is a low resonance speaker with a 2" high temperature voice coil. The unique Girdacoustic reinforced cone ensures true piston action and smooth performance extending well into the midrange region.
Treble Unit
High frequencies are reproduced by a horn-loaded compression driver utilizzing a duralumin diaphragm and a 2" diameter aluminium voice coil.

Crossover Network
The crossover network receives the electrical energy fromm the amplifier and divides it between thr high frequency compression driver and the low frequency bass driver and makes a vital contribution to the overall performance of the system.
Tannoy crossover networks are of the highest quality; capacitors are non-polarized, solid dielectric types for low lossles and close tolerances; resistors and inductors are very generously rated; and all components are assembled on a fibreglass printed circuit board for maximum reliability.
 System adjustment
The Tannoy system is provided with two controls located on the front baffle. These are labelled "Roll-off" and "Energy". They can be used to compensate for the acoustic characteristics of the listening room and should be adjusted with the amplifier controls in the flat or uncompensated position. Each loudspeaker system should be adjusted individually. This is mot easily done by rotating the amplifier Balance control to select the desired loudspeaker.
The Energy control has five positions and enables the output of the high frequency driver to be increased or decreased over its entire range from 1 kHz to 20 kHz. The Roll-off control affects only the extreme high frequencies, i.e. those above 5 kHz.
The flattest response will be obtained with both controls set at the "Level" position, which should be used for initial listening tests.  If the overall high frequency sound quality seems too prominent, the -1 or -2 positions for the Energy control should be tried. If the sound is subdued +1 or +2 will be preferred. Once the Energy setting has been established the Roll-off control can be adjusted to reduce extreme high frequency content if necessary.

Tannoy enclosures are solidly constructed from high density particle board and are lined with acoustic foam to absorb reflections and eliminate standing waves and bitumen to damp mechanical resonance. The exposed natural woodgrain surfaces of each enclosure are of American Walnut veneers. The cabinets are carefully handrubbed with oil and wax, which enhances the richness of the wood and affords excellent protection. Both the Arden and the Berkeley are braced internally to reduce spurious resonances which can occur in large panel areas, and ported to provide low frequency loading, thereby reducing distortion and extending bass response.
Low Frequency Direct Radiator
Maximum Diameter:  420 mm (16 ½")
Voice Coil Diameter:  50 mm (2")
Bl Factor in gauss/cm:  20 x 10⁶
Fundamental Resonance:  20 Hz
High Frequency Compression Driver
Duralumin Diaphragm:  50 mm (2")
Voice Coil  Diameter:  50 mm (2")
Horn Cut-off Frequency:  500 Hz
Drive System:  3828
Power Handling Capacity:  85 W
Nominal Impedance: 8 ohms
Frequency Response:  35 Hz - 20 kHz, ±4 dB
Sensitivity; Input Watts produce 96 dB at 1 m:  3
Crossover Frequency:  1 kHz
System Dimensions (H x W x D):  840 x 540 x 310 mm (33" x 21" x 12")

Weight:  41 kg (shipping)

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