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

Altec Lansing Fifteen

 Excellent acoustic output, full range response and extended bandwidth in a two-way system - the Fifteen speaks for itself. It represents a new generation of two-way systems - reaching far beyond the technology emoloyed in previous two-way floor-standing speaker systems.
The innovative radial phase plug, a result of a year-long Altec Research and Development investigation, is a key element in the Fifteen's extended high frequency response. It is the heart of an all new compression driver developed by Altec to give smooth response to beyond 20 kHz when coupled to the unique curved radial horn that has been adapted for use in the Fifteen.

 An exhaustive research program concentrating on low frequency performance has led to a thorough investigation of the enclosure/driver interrelationship. Internal acoustic pressure variations, material energy absorption, and dynamic thermal factors have been examined , analyzed and controlled to provide an optimum balance of low-frequency band limits and sensitivity. The Fifteen's superb low-frequency performance is the result of this enclosure tuning technology investigation.

 Extended low end, extended high end - results of major research and development efforts from Altec.  Put these powerful new technologies together in a hand-rubbed, oiled oak or walnut cabinet and you have the Fifteen - an exciting addition to any quality system.
Outstanding response and elegant styling - the Fifteen is equally comfortable in studio or living environment.

Speaker Components:  
Low Frequency : 12" bass driver
High Ffrequency : Radial phase plug compression driver mounted to curved radial horn
Nominal Impedance:  8 ohms
Crossover Frequency:  1700 Hz
Enclosure Type:  Vented
Sensitivity:  90 dB or 94 dB SPL
Frequency Response:  30 Hz - 20 kHz
120° at -6 dB vertical
120° at -6 dB horizontal
Long Term Broad Band Max. Power:  60 watts
Operational Power Range:  12 watts to 250 watts
Long Term Max Acoustic  Output:  111 dB SPL at 60 watts
Finish:  Hand-rubbed oiled walnut or oak
Grille: Acoustically transparent foam mounted on removable panel. Black supplied with walnut brown with oak cabinet.
Dimensions (W x H x D):  559 x 686 x 381 mm (22" x 27" x 15½")
Weight:  34,5 kg (76 lbs) net

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