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

KEF Q90 (1990-1994)

 KEF Q90
For those wanting the additional headroom and freedom provided by a full three-way system, the Q90 is the speaker of choice. This reflex-loaded floorstanding speaker is a no-compromise design, with a bold, dynamic and truthful performance. The 200 mm (8') unit, loaded by its own 11,7 litre sealed enclosure, gives wide open soundstanding, with outstandingly natural reproduction of voices and strings - the "difficult" areas of sound reproduction.
The reflex-loaded polymer-cone bass unit delivers powerful, extended but quick-sounding bass, with high output and power handling capability.
Twin gold-plated terminals allow bi-wired or bi-amplified operation. Adjustable, lockable feet give high stablility on any surface, and ensure that the Q90's exceptional dynamic qualities and midrange transparency are not compromised.
With all this, the Q90 has a small "footprint" - less than room square foot of floorspace - is elegantlt proportioned and easy to integrate into any listening room or hifi system.
Compatibility,flexibility, and high performance are the keynote features of the KEF Q90.

Type:  3-way floor standing
System:  SP3138
Drive units:
Bass unit (SP1285) : 200 mm (8") with 38 mm (1,5") coil (B200)
Midrange unit (SP1280) : 200 mm (8") with 38 mm (1,5") coil (B200)
B200 : midrange unit (SP1280),
Tweeter (SP1353) : Polymer dome with 25 mm (1") coil Fluid cooled, High Energy magnet Ne-Fe-B (NT25)
Crossover network:  SP2183
Frequency Range (±3 dB measured at 2m on reference axis):  40 - 20,000 Hz (-6dB 35 Hz)
Maximum Output (measured spl on programme peaks under typical listening conditions):  112 dB
Characteristic Sensitivity level:  89 dB (measured at 1m on reference axis for pink noise input of 2,83V rms[anechoic conditions] Q60 corrected for wall mounting)
Amplifier Requirements (into 8 ohms):  10 - 150 W
Nominal Impedance:  8 ohms
Enclosure Type:  Reflex
Internal Volume: 
MF: 11,7 litres (0.4 cu.ft.)
LF:  33,4 liter (1,18 cu.ft.)
Net Weight:  18,7 kg (41,1 lb)
Dimensions (H x W x D):  890 x 246 x 319 mm (35,0 x 9,7 x 12,5 inch)

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