The Rogers
Export Monitor meets the demands of thousands of enthusiasts that have pleaded
for an LS3/6 loudspeaker with increased power handling. Based on design
expertise acquired from five years of manufacture of the Rogers BBC LS3/6
Studio Monitor, this three unit system offers a standard of performance which
makes it a class leader and power handling more than adequate for domestic use.
The BBC LS3/6 has enjoyed an enviable reputation both home and abroad and has
come to be regarded as a standard by which others are judged. The need for
higher power handling, especially for the export markets has been researched
exhaustively with a refusal to accept deterioration in sound quality. The
Export Monitor has been received with enthusiasm worldwide and shows a
remarkable lack of colouration, with very low harmonic and intermodulation
distortion.
The Rogers
Monitor pioneer units in Bextrene Cone Technology, are the result of many years
research by the British broadcasting Corporation into loudspeaker cone
behaviour.
Available in
Teak or walnut veneer finish as standard with black grillecloth. De-luxe castor
trolleys are available which provide correct positioning relative to the floor,
whilst allowing easily manoevorability for cleaning or listener position
change.
Application
Originally
intended for monitoring purposes in the smaller studio, this loudspeaker will
give superlative reproduction in domestic high fidelity installations, where
the associated equipment is of a sufficiently high standard.
The superb
bass response is not dependent on corner location and the speaker is best set
away from wall and corners, so avoiding too much excitation of room resonances.
Due to the efficient and exxtended treble response of the speaker a slight
amount of filtering may prove beneficial an all but the very best programme
material. For this reason an amplifier with a good low pass filter should be
used.
The nominal
power handling capacity of the loudspeker is 35 watts speech and music. This
power level is entirely adequate for all normal domestic applications and is
also satisfactory for the small studio.
Construction
The main
drive unit used in the system is specially constructed and the performance
carefully evaluated for each loudspeaker. The special plastic cone and surround
material employed ensures a uniform response, any slight residual colouration
being minimised by individual doping of the cone, a process carried out by hand
by a skilled craftsman.
The tweeter
units are specially selected and all must meet a rigid pass specification.
Matching of bass unit and tweeter unit efficiencies is controlled by a low loss
autotransformer with 1 dB tappings.
A
sophisticated crossover uses close-tolerance inductors and stable low-loss
capacitors for lifelong stability of operation. The enclosure is made from
selected woods, which in conjunction with special internal damping materials, avoids resonance and colouration.
The standard
finish is teak or walnut veneer.
Testing
All Rogers
Export Monitor Loudspekaers are individually measured on Bruel and Kiser
automatic curve tracking equipment, installed in our own anechoic building at
Catford. Each speaker is carefully adjusted to meet a rigid specification and
an individual response curve graph taken.
After
frequency response tests have been carried out the final performance of each
individual speaker is compared to a
Reference Standard BBC LS3/6 Loudspeaker on pink noise and master tapes of the
highest quality.
Specifications;
Enclosure
Type: 3-way, bass reflex
Overall
Frequency Response: 40 - 25,000 Hz; 40 - 14,000 Hz ±3 dB
Power
handling capacity: 35 watts, speech and
music
Impedance: suitable for 8 - 16 Ω matching amplifiers
Drive
Units: 3
Dimensions
(W x D x H): 305 x 305 x 635 mm
(12" x 12" x 25")
Weight: 15,5 kg (34 lbs) net
Finish: Teak or Walnut veneer with black grillecloth