Model Seven

State-of-the-Art Design
in Compaction
and Transparency

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 any
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
of presentation.


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 kHz.

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

Finishes:                                Standard, Walnut; optional, Rosewood, Teak, Oak, and Lacquered finishes;
                                                  custom grill cloth on special order only.

Warranty:                               Limited, three years parts and labor against manufacturing defects.

Hear them at:

2711         RENA            ROAD
MISSISSAUGA,                   ONT
L4T 3KI - (416) 677-9020

Additional photographs of Watson Labs speakers

                                 Front view without grill cloth

                                             Rear view without grill cloth

                Crossover network

© 1980 Wright Electroacoustics


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