Assessments - 4, GPA: 4.3
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Diaphragm: Replacement L.F. Recone Kit: Replacement Grille: Dimensions: Net Weight: Shipping Weight: Finish: Figure 1. Frequency Response (See Note 2) FREQUENCY (Hz) Figure 3. Magnitude of Impedance f/\i A/SAi fu%l\ lA/flívíi'r Third / /• Harmonicjlf | I IM I, IL 200 500 1K 2K FREQUENCY (Hz) Figure 5. Harmonic Distortion at 0.01 Rated Power (2.5 watts, See Note 7) Vented type for optimum response, built of Va" (1.9 cm) black stained birch plywood (unfinished veneer model; 9815-8A) with appropriate bracing and stiffeners, lined with glass wool, including Vi6M tee-nut mounting points on each side and a removable grille. Red and black five-way binding posts. Model 26420 Model R3154 RC-M500 33" (83.8 cm) high 26]/2" (67.3 cm) wide 171/5" (44.5 cm) deep 86 lbs. (39.1 kg) 98 lbs. (44.5 kg) Black stained birch veneer (M500) and unfinished birch veneer (9815-8A), black grille cloth. Figure 2. Phase Response (See Note 6) 30 C ? io o < Ul sc. 10 20 30 ■ I..... I -1-1-1 A. Maximum Inductive Phase Angle is 39° at 1028 Hz A V - I 1 B. Maximum Capacitive Phase Angle is 41° at 9 Hz 1 1 1 10 20 30 50 60 Figure 4. Complex Impedance FREQUENCY (Hz) Figure 6. Harmonic Distortion at 0.1 Rated Power (25 watts, See Note 7) 80° 270® BO® 870' 315 Hz BO® 870° 800 Hz 2000 Hz 5000 Hz 90® 270‘ 8000 Hz 10000 Hz 400 Hz 6300 Hz Figure 7. One-third Octave Polar Response Charts (See Note 8) 12500 Hz HORIZONTAL-VERTICAL-SCALE IS 5 dB/div. 16000 Hz 20000 Hz 31.5 63 125 250 500 1K 2K 4K 8K 16K FREQUENCY (Hz) Figure 8. Coverage Angle 31.5 63 125 250 500 1K 2K 4K 8K 16K FREQUENCY (Hz) Figure 10. Horizontal Off-Axis Response Contours 31.5 63 125 250 500 1K 2K 4K 8K 16K FREQUENCY (Hz) Figure 9. Q and Dl FREQUENCY (Hz) Figure 11. Vertical Off-Axis Response Contours DISTANCE (m) 10000 10B31 11663 13326 14157 TIME U») Figure 12. Energy Time Curve (See Note 9) Figure 13. Time Energy Frequency Curve (See Note 10) SOUND PRESSURE LEVEL (dB) NOTES ON MEASUREMENT CONDITIONS 1. Pink noise signal, one Watt calculated using E'2/Zmin, 3.16 meter measurement distance referred to one meter. 2. On-axis, one Watt calculated using EA2/Zmin, 3.16 meter measurement distance referred to one meter, low frequencies corrected for anechoic chamber error. 3. This system rating patterned after the AES method for individual driver, where the test signal is pink noise with 6dB crest factor over the bandwidth of the system, with power calculated using E*2/Zmin, for two hours. 4. This measurement made under the same conditions as Pressure Sensitivity, but at rated power, and takes into account any power compression effects due to non-linearities in the system. 5. The loudspeaker system should be connected to the 8-Ohm tap on amplifiers using transformer coupled output sections. 6. Phase response of the system is measured at a time corresponding to the energy arrival of the high frequency component where the 5/16-18 HEX NUT- 5/16-18 FORGED EYE BOLT FLAT WASHER amplitude response is optimally flat, as noted on figure 12. 7. Distortion components invalid above 10 kHz. The distortion at any given frequency may be found by graphically taking the difference between the fundamental and harmonic, adding the number of Decibels which the harmonic has been raised on the graph and apply the formula: percent distortion = 100 X 10" (-dB change/20) 8. The axis of rotation for all polar plots is the apparent apex of the high frequency driver. Plots below 200 Hz have not been shown because of their lack of pertinent information. 9. The time window has been chosen to resolve the arrival times of the low and high frequency components. Frequency bandwidth of the measurement, 0 Hz - 20 kHz. 10. Response decay of the system. Time window is selected to display loudspeaker and box characteristics without room reflections. CENTER OF GRAVITY A = 16 in. (34.3cm.) B = 8 3/4 in. (19.0cm.) LOUDSPEAKER SYSTEM IS SHOWN SUSPENDED WITH LOW FREQUENCY DRIVER TOWARD THE BOTTOM. Figure 14. 26 1/2 67.3cm. 33” 83.8cm. 25" 63.5cm. 10.2cm. I -9- 4”— 10.2cm ■ 17.5” -44.5cm. <)-- 9.5” 24.1cm. LOUDSPEAKER SYSTEM IS SHOWN WITH LOW FREQUENCY DRIVER TOWARD THE BOTTOM Figure 15. ARCHITECT'S AND ENGINEER'S SPECIFICATIONS The loudspeaker shall be the Altec Lansing Maestro Series M500. It shall be of the two-way bass reflex type, consisting of a front mounted 16-inch (40.6 cm) low-frequency loudspeaker, a high-frequency compression driver on an injection molded constant directivity horn, and a dividing network having a crossover frequency of 630 Hz. The loudspeaker system shall meet the following performance criteria: Power handling, 250 watts of pink noise with 6 dB crest factor, band width limited from 48 Hz to 20 kHz. Frequency response, smooth and uniformly usable at high levels from 48 Hz to 20 kHz. Pressure sensitivity, 96.5 db SPL at one watt, 500 Hz to 3 kHz, measured at a distance of one meter on axis. Impedan...