Altec Lansing 418-8H User's Manual
Contents
1. A DIVISION OF ALTEC CORPORATION 418 8H Musical Instrument Loudspeaker The ALTEC 418 8H Musical Instrument Loudspeaker is a rugged 15 loudspeaker designed for use in musical entertainment systems of moderate size and coverage area where true high fidelity reproduction must be combined with high power output The 418 8H has a heavy permanent magnet a structurally reinforced die cast aluminum frame a 3 diameter edge wound voice coil of copper ribbon and a cone suspension having exceptional compliance It is sealed against dust and dirt The smooth response and excellent linearity of the 418 8H loudspeaker is achieved by strict adherence to precision design and manufacturing tolerances The axial retention of the voice coil in a magnetic field uniform over the full excursion ensures clarity of music reproduction at high power levels The low cone resonance when the speaker is mounted in a suitable enclosure virtually eliminates all doubling or self generation of unwanted harmonic components The 418 8H has a continuous power rating of 150 watts and a frequency response from 45 to 8000 Hz Its design provides high efficiency high linearity low distortion wide range and optimum cone resonance ALTEC 1515 S Manchester Ave Anaheim Calif 92803 __ ALTEC 418 8H Loudspeaker Type Power Rating Frequency Response Pressure Sensitivity Nominal Impedance Nominal Free Air Cone Resonan2. ark of DuPont SURE TH TT TAT TT T me Ce in Ae COMIC ECE PEAT CO CCCI ae CPE E TEE oT 10 20 1000 2000 5000 10000 20000 FREQUENCY IN HZ ide amp S 5 A A A 74 RESPONSE IN dB 64 Figure 1 418 8H Frequency Response Measured at 4 on Axis with 1 Watt Input ARCHITECT S AND ENGINEER S SPECIFICATIONS The musical instrument loudspeaker shall have a maximum diameter of 15 5 16 e and shall weigh 14 pounds 6 ounces It shall have a structurally reinforced die cast aluminum frame which shall be rigid enough to permit front or rear mounting The voice coil shall be 3 in diameter of edge wound copper ribbon and shall operate in a magnetic gap having a flux density of 13 000 gauss The loudspeaker shall have an Alnico V permanent magnet weighing not less than 2 4 pounds The magnetic structure shall have a metal dust cover to protect it from dirt iron particles and magnetic dust The cone surround area shall be of high compliance cloth The musical instrument loudspeaker shall meet the following performance criteria Power rating up to 150 watts of continuous program material Frequency response uni form from 45 to 8000 Hz Pressure sensitivity 99 dB SPL with 1 watt input of band limited pink noise from 100 Hz to 10 kHz measured on axis 4 from cone 98 dB SPL with 1 watt input of band limited pink noise from 100 to 1000 Hz measured on axis 4 from cone Ref 0 0002 dyne cm2 Equ
3. ce Voice Coil Diameter Magnetic Assembly Magnet Weight Assembly Weight Magnet Type Flux Density Construction Frame Basket Cone Cone Suspension Voice Coil Voice Coil Support Material Maximum Cone Excursion Diameter Weight Mounting Data Mounting Hole Diameter Mounting Bolt Centers Loudspeaker Depth SPECIFICATIONS Musical instrument loudspeaker For sound system use with amplifiers having continuous power rating of up to 150 watts with program material 45 Hz to 8000 Hz see Figure 1 99 dB SPL with 1 watt input of band limited pink noise from 100 Hz to 10 kHz measured on axis 4 from cone Ref 0 0002 dyne cm2 Equal to EIA rating of 52 dB SPL meas sured on axis 30 from cone with 1 milliwatt input 98 dB SPL with 1 watt input of band limited pink noise from 100 to 1000 Hz measured on axis 4 from cone Ref 0 0002 dyne cm2 8 ohms other impedances available in production quantities 55 Hz gre 2 4 pounds 10 5 pounds Alnico V 13 000 gauss Structurally reinforced die cast aluminum Molded fiber High compliance cloth surround with mechanical resistance Edge wound copper ribbon Aluminum with Kapton insulation 1 2 15 5 16 38 89 cm 14 pounds 6 ounces 6 53 kg 13 5 8 34 61 cm may be either front or rear mounted 8 holes equally spaced on 14 9 16 36 99 cm diameter circle 7 17 78 cm ms Kapton is a registered tradem
4. ivalent EIA rating 52 dB SPL measured on axis 30 from cone with 1 milliwatt input Nominal impedance 8 ohms Nominal free air cone resonance 55 Hz The musical instrument loudspeaker shall be the ALTEC Model 418 8H ___ ALTEC 418 8H Loudspeaker juig k LITHO IN U S A CP 273 5K Specifications and components subject to change without notice Overall performance will be maintained or improved AL 1824
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