Low Distortion Soft Dome Tweeter
VLR Upper and Lower Mid-Range Dipole Elements
Gas-Linearized-Compliance Woofer System
"Pulse Criteria" Phase Alignment
Third Order Bessel Crossovers
Matched Pair System
A design in which every method which would permit compaction without
compromise in performance or transparency was used to produce a
loudspeaker system of modest dimensions and superb realism.
Designing an "apartment-size" speaker system poses several difficult problems if both extended range and transparency are to be achieved. A "pulse criteria" phase alignment was used with a unique cabinet design to maintain very low coloration throughout the critical mid-range; this with the very low distortion soft dome tweeter employed, and the unique gas-linearized-compliance woofer system fed from an 18 dB/8ve crossover resulted in excellent performance and efficiency. Not too much larger than a bookshelf sized unit, the performance is nevertheless much better than that class. The style and finish allow the speakers to be presented to the eye in room decor rather than being hidden away.
All of the drivers have been carefully designed to operate over much wider ranges than they are subject to here, this with a rapid crossover rolloff achieves very low coloration as even out of band anomalies are not present.
With a major axis skewed 150 towards the listener, the speakers are
used in matched pairs, and can be placed with their backs parallel to the
wall. The use of a separate woofer enclosure with an isolation slot
permits the use of a proper physical offset needed for pulse coherence,
and yet minimises the apparent visual mass of the system. As is the
case with the Model Ten, several wood finishes are available and can be
replaced without changing the entire system.
Note that the distortion curve is based on the adjustment of the speaker
input level so that a fundamental level of 90 dB is produced one meter
on axis; while this results in a higher apparent distortion level at low
frequencies than is usually published we believe it to be the less deceiving
of the methods
The distortion curve shown is the total distortion of oscillator, amplifier,
speaker, microphone and meter. The residual distortion in the test
set up is generally under .025% up to 5 kHz when it rises up to 3% at 20
Frequency Response: (in average room 8 feet from speakers) plus/minus 5 dB, 20 to 20,000 Hz
Distortion: Harmonic, (based on 90 dB level at 1 kHz): Generally under.4% above 200 Hz.
Sensitivity: 1 Watt = 91 dB
Power Handling Capacity: 150 watts Music
Maximum SPL: (pair - 1500 ft@ room): 113 dB
Speaker Complement: 1
- 1 " soft dome tweeter
1 - 5" upper mid-range
1 - 8" lower mid-range
1 - 10" woofer
Crossovers: 250 Hz, 800 Hz, 6000 Hz, @ 18 dB/8ve
Size: 33" High x 19 1/2" Wide x 15" Deep
Weight: 62 lbs. each
Standard, Walnut; optional, Rosewood, Teak, Oak, and Lacquered finishes;
custom grill cloth on special order only.
Limited, three years parts and labor against manufacturing defects.
Hear them at:
2711 RENA ROAD
L4T 3KI - (416) 677-9020
Additional photographs of Watson Labs speakers
Front view without grill cloth
Rear view without grill cloth
© 1980 Wright Electroacoustics
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