is the perfect low frequency comPani
on for theDS912-8A
. Equipped with a 15 inch / 380 mm low frequency
speaker housed in a durable 18 mm / 13-Ply Poplar cabinet, theLF115-8A
offers affordable system expansion in an easy-to-install
package. The LF115-8A
will complement the low frequency
performance in Auditorium and House of Worship systems.Altec Lansing
's high performance model 4156-8A
woofer is a 15
inch / 380 mm speaker with a robust corrosion-resistant die-cast
frame and a weather-resistant cone for maximum durability in all
The unique on-board crossover network provides simplistic addon
operation without the need for an additional power amplifier
channel or the costs associated with additional amplification and
an active crossover. The charcoal grey or white painted cabinet
blends into most backgrounds, or it can be easily painted to
match any dcor. Altec Lansing
includes neutral grille cloth with
each speaker, allowing you to dye the cloth to integrate the
speaker into the surroundings. The cabinet also features internal
hanging points to facilitate permanent installation in either a
horizontal or vertical orientation.
Used Altec Lansing
Established in 1937, today Altec Lansing Professional is a leading manufacturer of high performance, high quality professional audio systems and components. Altec Lansing traces its history to the group of Western Electric® engineers who developed the first commercial professional sound system for the movie "The Jazz Singer" starring Al Jolson. This "talkie" revolutionized motion picture sound, and marked the starting point of the twentieth century audio revolution.
Altec Lansing celebrates the company's rich heritage in the professional audio industry. Our history of technological innovation is unmatched.
- A speaker is a device that converts an electrical signal into the equivalent air vibrations in order to make audible sound.. Used . . Used . ...Fresnel
- Fresnels are typically 8-, 6- or 4-inch, referring to the diameter of the lens. This light is named after Augustin-Jean Fresnel who invented the distinctive Fresnel lens which has a 'stepped' appearan. Used . ce instead of the 'full' or 'smooth' appearance of other lenses. The stepped nature of the lens causes a corresponding pattern of circles of light, so Fresnel lenses are usually 'stippled' on. Used . the flat side. This pattern of small bumps helps to break up the light passing into the lens to smooth out its eventual pattern.
Fresnels use a spherical reflector, with the filament of the bulb ...Acoustics
- Acoustics is a branch of physics and is the study of sound, mechanical waves in gases, liquids, and solids. A scientist who works in the field of acoustics is an acoustician. The application of acoust. Used . ics in technology is called acoustical engineering. There is often much overlap and interaction between the interests of acousticians and acoustical engineers.
"... acoustics is . Used . characterized by its reliance on combinations of physical principles drawn from other sources; and that the primary task of modern physical acoustics is to effect a fusion of the principles normally adhering t...Intensity
- Measured in both lux and lumens. For any given luminaire (lighting instrument or fixture), this depends upon the power of the bulb, the design of the instrument (and its corresponding efficiency), the. Used . presence or absence of color gels or gobos, distance from the area to be lit, the color and subtance to be lit, and the neuro-optics of the total scene (that is, the relative contrasts to ot. Used . her regions of illumination). ...Intelligent Fixtures
- Intelligent Fixtures or Moving Lights were originally implemented in 1972, but the first computer-controlled stage lighting fixtures began to gain widespread acceptance in the concert industry in the . Used . early 1980's. As the digital age progressed, the cost of these fixtures was reduced and they slowly started being used in more 'traditional' theatrical environments. Intelligent fixtures are . Used . currently used in almost all major theatrical productions.
Usually relying on compact arc lamps as a light source, these fixtures generally use stepper motors connected to varying internal devices...
Subwoofers are speakers that are designed to reproduce low-pitched or the bass frequencies typically ranging from about 20 to 200 Hz for consumer products, below 100 Hz for professional live sound, and below 80 Hz in THX-approved systems. These are complete loudspeakers intended to enhance the low frequency range of loudspeakers covering higher frequency bands.
Subs, another term for subwoofers, are made up of one or more woofers in a loudspeaker enclosure capable of withstanding air pressure while resisting deformation. These subs require more power to operate because they are bigger (usually between 20.3 cm and 38.1 cm in diameter). Enclosures are available in a variety of designs that differ by efficiency, bandwidth, size and cost. Designs include bass reflex with a port or passive radiator in the enclosure, infinite baffle, horn-loaded, and band pass designs. A multimedia home theater system in low-cost compact plastic cabinet that is said to be a subwoofer is more appropriately called a bass driver because it is too small to produce deep bass.
Subwoofers are also powered by amplifiers. Active or powered subwoofers are driven by a built-in amplifier. Passive subwoofers have an external amplifier, subwoofer drivers and enclosures.
Subwoofers are popular because of they can pack a large, low frequency punch in a small space, providing a powerful audio experience like being in a movie theater or a concert venue. They are installed in cars or at home as part of a home theater system which is a more common application. In both cases, the subwoofer or low frequency speaker is not considered a stand alone device but helps to reinforce the higher pitched sound produced from the speakers.