Electro-Voice LF215 User's Manual
Contents
1. SPECIFICATIONS Usable Frequency Response 40 Hz to 5 kHz Sound Pressure Level 4 Ft at 400 Watts Input 129 dB 10 Ft at 1 Watt Input 95dB Long Term Average Power Handling Capacity 400 watts Nominal Impedance 4 ohms Minimum Impedance 3 3 ohms 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 28 2 wide Weight 46 7 kg 103 Ibs nput spectrum pink noise fed into shaping filter with 18 dB per octave slopes below 100 Hz and above 800 Hz See POWER HANDLING TEST section DESCRIPTION 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 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 APPLICATIONS The LF215 is desi2. eturned prepaid Warranty does not cover finish or appearance items or malfunction due to abuse or operation at other than specified conditions Repair by other than Electro Voice or its authorized service agencies will void this guarantee For repair information and service locations please write Service Depart ment Electro Voice Inc 600 Cecil Street Buchanan Michigan 49107 Phone 616 695 6831 or 7473 Avenue 209 625 1330 1 Electro Voice also maintains complete facilities for non warranty service of E V products Specifications subject to change without notice Part Number 530129 127 a GUILON comeany ELECTRO VOICE Inc 600 CECIL ST BUCHANAN MICH 49107 MANUFACTURING PLANTS AT BUCHANAN MICH NEWPORT TENN SEVIERVILLE TENN GANANOQUE ONT E LITHO IN U S A
3. gned 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 2 electronic crossover is also an ideal companion to this product Eleciro Voice gultan company Model L215 Low Frequency Sneaker System 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 parallelled 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 data was measured in a half space anechoic echoless environment at 10 feet on axis with 4 volts of swept 1 3 octave random noise The frequency response curve for the LF215 is shown in Figure 2 DISPERSION The polar freauency response curves for the LF215 are given in Figure 4 This data was taken using octave band centered pink noise with 4 volts applied to speakers and measurements were made with the speaker systems mounted in both the horizontal and vertical positions at 10 feet From this data the 6 dB down points were obtained and a beamwidth versus frequency plot was made This information is shown in Figure 3 FIGURE 1 Dimensions EE LEINEN er UAT NTI Leas enone Ro
4. ne ET ELIA Swen TERN Environment B 8 8 88338388 8 8 583883 FIGURE 3 LF215 Beamwidth vs Frequency System Long Axis Vertical BEAMWIDTH IN DEGREES O VERTICAL Bu A HORIZONTAL ELL THRE LL 8 5383888 Y 5588888 ee FREQUENCY IN HERTZ AN eal ee POWER HANDLING TEST To our knowledge Electro Voice was the first U S manufacturer to develop and publish a power test closely related to real life conditions First we use a random noise input signal because it contains many frequencies simultaneously just like real voice or instrument program Second our signal contains more energy at extremely high and low frequencies than typical actual program adding an extra measure of reliability Third the test signal includes not only the overall long term average continuous level which our ears interpret as loudness but also short duration peaks which are many times higher than the average just like actual program The long term average level stresses the speaker thermally heat The instantaneous peaks test mechanical reliability cone and diaphragm excursion Note that the sine wave test signals sometimes used have a much less demanding peak value relative to their average level In actual use long term average levels exist from several seconds on up but we appl
5. y the long term average for several hours adding another extra measure of reliability Specifically the LF215 is designed to withstand the power test described in EIA Standard RS 426 The EIA test spectrum is applied for eight hours To obtain the spectrum the output of a white noise generator white noise is a particular type of random noise with equal energy per bandwidth in Hz is fed to a shaping filter with 6 dB per octave slopes below 40 Hz and above 318 Hz When measured with the usual constant percentage bandwidth analyzer one third octave this shaping filter produces a spectrum whose 3 dB down points are 100 Hz and 1200 Hz with a 3 dB per octave slope below 1200 Hz This shaped signal is sent to the power amplifier with the continuous power set at 400 watts into the 2 8 ohms EIA equivalent impedance 33 5 volts true RMS Amplifier clipping sets instantaneous peaks at 9 dB above the continuous power or 3200 watts peak 94 7 volts peak This procedure provides a rigorous test of both thermal and mechanical failure modes WARRANTY Limited Electro Voice Music Loudspeaker Systems and Accessories are guaranteed for five years from date of original purchase against malfunction due to defects in workmanship and materials If such malfunction occurs unit will be repaired or replaced at our option without charge for materials or labor if delivered prepaid to the proper Electro Voice service facility Unit will be r
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