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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





Electro-Voice LF-215 speakers

The Electro-Voice Model LF215 is a high-performance low-frequency speaker system designed for applications where portability is important. The LF215 features two EVM15L speakers connected in parallel and mounted in a 6,5 cubic feet enclosure equipped with heavy-duty casters. The enclosure is constructed of black vinyl covered 3/4-inch plywood, with protective extruded aluminum trim and recessed handles. The  rugged construction of the LF215 makes it ideal for road use.

The LF215 is designed to work well with the Electro-Voice HR series horns and DH series drivers for use in large music stage systems where a portable system is desired. The Electro-Voice XEQ-1 electronic crossover is also an ideal companion to this product.

Four rubber feet are provided on one side of the enclosure so that the LF215 may be laid on its side for stacking. Stacking will approximately halve the rated coverage angle (beamwidth) and increase the on-axis output by 6 dB. 3 dB comes because two paralleled LF215's will draw twice the power from the usual solid state amplifier. The other 3 dB comes from the reduced coverage angle.

Frequency Response

Frequency Response date was measured in a half-space anechoic (echoless) environment at 10 feet on axis with 4 volts of swept ⅓-octave random noise.

 

SPECIFICATIONS

Usable Frequency Response:  40 Hz to 5 kHz

Sound Pressure Level

4 ft at 400 watts input :  126 dB

10 ft a 1 watt input :  95 dB

Long-Term Average Power Handling Capacity:  400 watts

Nominal Impedance:  4 Ω

Minimum Impedance:  3,3 Ω

6 dB Down Beamwidth for Possible Crossover Frequencies, indicated Bands of 1.3 Octave Random Noise, Long Enclosure Axis Vertical

500 Hz Horizontal :  118°

800 Hz Horizontal :  118°

500 Hz Vertical :  52°

800 Hz Vertical :  37°

Connections:  Parallel 1/4" phone jacks (allows paralleling of multiple speakers)

Enclosure Material:  3/4" plywood

Finish:  Black Vinyl with aluminum trim

Dimensions:

98,6 cm (38,8") high including casters

38,6 cm (15,2") deep

71,6 cm (28,2") wide

Weight:  46,7 kg (10,3 lbs)

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