Ever since the
Celeste was released in 1962 KEF has been noted for producing high performance
compact loudspeakers. The Cresta, released in 1967, set new standards with the
newly developed B110 and T27 drivers that were later to be adopted in the world
famous BBC designed LS3/5A broadcast monitor.
KEF Model 101 is a
truly outstanding product of modern loudspeaker technology. Although small in
overall dimensions and simple appearance. Model 101 contains one of the most
advanced sound reproduction systems ever developed and achieves a standard of
acoustic performance superior to that of many for larger loudspeakers.
Model 101 is a
loudspeakers of Reference quality which will satisfy the professional user and
enthusiast whose amplifier and related equipment are of the highest standard,
but who require small, unobtrusive loudspeakers.
Model 101 offers
many advantages over larger models where space is restricted as the systems are
easily located to give excellent tonal balance and sharp,clear stereo images.
Novel and precise production methods guarantee the frequency response within fine
limits resulting in stereo reproduction
of outstanding perspective and sharpness.
Model 101 combined
the T27 tweeter with the SP1057 version of the B110 in a 6.7 litre closed box.
The system was fully overload protected by the S-Stop system, included
mechanical decoupling of the bass driver to minimize colouration and each pair
were acoustically matched to within 0.5dB. The result was a system with
accurate tonal balance and detailed stereo imaging - being suitable for use
with the best electronics - and able to fit unobtrusively into the listening
room.
Features
Flat frequency
response to 90 Hz (-10 dB at 47 Hz)
Two way system with
minimum interunit time deley
Pairing of systems
guarantees sensitivity and frequency response match to within 0,5 dB
Fully protected
against fault conditions when used with amplifiers up to 100 watts
Electronic
protection -S-Stop protects against overload and fault conditions
The laws of physics dictate that a small enclosure
must either give less bass or have lower efficiency. To achieve a balance
response in the design of Model 101, KEF use a tonal system design approach so
that the drive units, filter networks and enclosures are developed together to
achieve the broadcast band width with the optimum efficiency.
The close tolerances
needed to realise the full potential of the design are maintained in production
by a unique matching procedure so that every pair of Model 101's is matched in
frequency response to within 1dB of the original laboratory prototypes.
The widespread use
of high powered amplifiers which can deliver the full dynamic range captured
with modern recording techniques, has made it necessary to protect loudspeakers
against accidental overload. In Model 101 a self-powered electronic circuit called
S-Stop, protects the loudspeakers from the effects of overload and
automatically re-connects the full input signal to the system only when the
overload is removed.
To allow the sound
to reach the listener directly without troublesome reflections from walls,
floor or ceiling the drive units are arranged within the 7 litre enclosure so
that the full frequency response is enjoyed when the loudspeakers are
positioned approximately 75 mm from the floor.
An optional stand,
the ULS 20, allows the speaker to be conveniently and elegantly converted to a
free standing system.
Specification: Model
101
System type: Two-way, bookshelf/stand-mount
Enclosure type: Closed box
Input
Impedance: 8 ohms
Rated maximum
power: 100 W programme
Amplifier
Requirements: 20 - 100 watts per channel
into 8 ohms
Frequency
response: 90 - 30,000 Hz ±2 dB at 2m on
measuring axis (-10dB at 47Hz and 40kHz)
Sensitivity: 81 dB at 1m for a pink noise input of 1W
Distortion (Measured
at 1m on measuring axis at mean spl of 90 dB, anechoic conditions):
Second Harmonic :
less than 1% from 120 Hz to 20 kHz
Third Harmonic :
less than 1% from 70 Hz to 20 kHz
Directional
Characteristics:
Horizontal : within
±2 dB of axial response up to 20 kHz for ±20°
Vertical : within ±2
dB of axial response up to 20 kHz for ±5°
Crossover
Frequencies: 400, 2500 Hz
Maximum output: 100 dB on programme peaks under typical
listening conditions
Finishes:
Walnut, teak, rosewood and black ash veneers
Grille: Black cloth
Size: 340 x 180 x 190 mm (13.4 x 7.1 x 7.5 inches)
Weight: 5.6 kg (12.3 lb)
System: SP1122
Drive units: B110 bass/midrange unit (SP1057), T27 tweeter
(SP1032)
Crossover: SP1123 and SP1124 (SP2010 from 1983)