Assessments - 4, GPA: 4
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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. 1515 S. Manchester Ave., Anaheim, Calif. 92803 ALTTEQ A DIVISION OF ALTEC CORPORATION ALTEC 418-8H Loudspeaker— SPECIFICATIONS Type: Power Rating: Frequency Response: Pressure Sensitivity: Nominal Impedance: Nominal Free-Air Cone Resonance: 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: 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/cm^). 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/cm^) 8 ohms (other impedances available in production quantities) 55 Hz 3" 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 holesequally spaced on 14-9/16" (36.99 cm) diameter circle 7" (17.78 cm) *Kapton® is a registered trademark of DuPont. RESPONSE IN dB 10 20 50 100 200 500 1000 2000 5000 10000 20000 FREQUENCY IN HZ 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" 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, uniform 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). Equivalent El A 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 LITHO IN U.S.A. CP-273-5K B , i.- . , i. , AL-1824 Specifications and components subject to change without notice. Overall performance will be maintained or improved....