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

Celestion Ditton 120

 The name Celestion has been synonymous with loudspeakers since 1924 ans is today held in high esteem throughout the world by sound engineers and music lovers alike.
The high fidelity loudspeakers detailed  in this article the latest in the famous "Ditton" range and is the  result of extensive research and development carried out in the Celestion laboatories.
Celestion quality is evident throughout the new Ditton 120 and the unrivalled and exclusive Celestion features which have made Celestion "Dittons" world famous are incorporaed into this new system.
 The upper register from 3 kHz to 15 kHz is reproduced faithfully by the renowned HF 1300 treble unit, many thousands of which have been supplied to manufactures for inclusion in monitoring systems. This "pressure" type unit is 1½" (38 mm) diameter and has an exceptionally smooth response due to careful attention to phase correction and acoustic damping.  The very low mass of the diaphragm assembly and the high magnetic flux permit transient response ofa high order. The small area of the diaphragm provides an excellent polar radiation pattern and ensures a highly satisfactory stereophonic image.

The middle-bass register is reproduced by a sophisticated unit of very high quality. The diameter is 5" (120 mm) and a linear diaphragm excursion of up to ½" is possible ensuring correct reproduction of bass notes at all volume levels. The diaphragm assembly is controlled by a massive magnet system having a flux of 50,000 Maxwells which ensures high efficiency and optimum damping.
 The third radiator is a new version of the exclusive Celestion auxiliary bass radiator now known universally as the ABR. This device ensures improved reproduction of low bass notes even with comparatively small enclosure dimensions. The ABR is operative at the lowest part of the register from 35 Hz to 70 Hz and since the work is shared between the two bass diaphragms efficiency is increased and distortion reduced to a vry low order; in short, the ABR ensures true bass.

The electrical system is integrated by an inductance-capacity frequency dividing network which has been meticulously designed to provide a level response.
 The Celestion Ditton 120 reproduces the full audible range and is suitable for connection to virtually all high quality amplifiers. Where cost and size figure the Ditton 120 provides outstanding value and performance. The appearance will please the most fastidious and the smooth and effortless sound quality will delight the musican and connoisseur alike.
 The appearance and finish of the 120 enclosure is excellent. By using a single sheet of veneer to completely enclose the four sides of the cabinet there is a joint running of the cabinet there is a joint running along one edge only; conseguently it will look equally good in whatever position it is placed. The rear is neatly finished with connections provided by means of two colour-coded screw terminals.

 Drive Units and cabinet
1. Treble Unit Type HF 1300, Phase Corrected, Acoustically Damped, Studio Standard ± 2 dB
2. Mid-Bass Unit, Ultra Compliant Suspension, High Flux (50,000 Maxwell) Magnet
3. Auxiliary Bass radiator (known as ABR) maintains output over 35 Hz - 70 Hz band
4. Anechoic wedges eliminate standing waves (concealed), low loss crossover network
Response:  35 Hz to 15 kHz
Max Input:  20 watts (DIN 45 500)
Crossover:  Low loss L/C network at 3,000 Hz
Impedance:  4 - 8 Ω
Treble Unit:  38 mm (1½") Pressure Type
Mid-Bass Unit:  120 mm (5") Long throw
Auxiliary Bass:  120 mm (5") 15 Hz Resonance
Finish:  natural teak or walnut

Dimensions:  17¼"  x  9" x  7¾"

Nessun commento:

Posta un commento