Assessments - 4, GPA: 4.3 ( )

Fabricante : Altec Lansing Arquivo Tamanho: 785.37 kb Arquivo Nome : Língua de Ensino:

Figure 2 shows a typically ‘flat’ response of the Model 19 when both frequency controls are set in the OPTIMUM area of operation. When the HF LEVEL control is turned counterclockwise from the OPTIMUM area, the higher frequencies are ‘rolled off’ or reduced in volume. This enhances the bass and mid-range frequencies. When the MF LEVEL control is turned counterclockwise from the OPTIMUM area, the mid-range frequencies are attenuated, producing a ‘dip’ in the mid-range portion of the audio spectrum. This enhances the bass and treble frequencies. Turning the control clockwise from the OPTIMUM area enhances the mid-range frequencies. Figure 3 shows effects to the audio spectrum when the two controls are turned fully ‘up’ or ‘down’. With both controls ‘up’ (solid line), both mid-range and treble frequencies are enhanced. With both controls fully ‘down’ (broken line), the same frequencies are attenuated, which enhances the bass frequencies. Figure 4 shows effects to the audio spectrum when the controls are turned to extreme opposites to one another, with 10 20 50 100 200 500 1000 2000 5000 10000 20000 FREQUENCY IN HERTZ Figure 2. Typical Response of Model 19 with Optimum Control Settings 10 20 50 100 200 500 1000 2000 5000 10000 20000 FREQUENCY IN HERTZ SOLID LINE = HF AND MF CONTROLS FULLY CLOCKWISE BROKEN LINE = HF AND MF CONTROLS FULLY COUNTERCLOCKWISE Figure 3. Typical Response of Model 19 with Controls at Maximum and Minimum Positions 10 20 50 1 00 200 500 1000 2000 5000 10000 20000 SOLID LINE = HF CONTROL FULLY COUNTERCLOCKWISE, = MF CONTROL FULLY CLOCKWISE BROKEN LINE = HF CONTROL FULLY CLOCKWISE, = MF CONTROL FULLY COUNTERCLOCKWISE Figure 4. Typical Response of Model 19 with Controls at Opposite Maximum and Minimum Positions one control fully ‘up’ and the other control fully ‘down’. With the HF control ‘down’ and the MF control ‘up’ (solid line), mid-range frequencies are enhanced and treble frequencies are attenuated. With the HF control ‘up’ and the MF control ‘down’ (broken line), mid-range frequencies are attenuated and treble frequencies are enhanced. Maximum range of the two controls is nominally 14 dB. Upon inspection of the curves shown in Figures 3 and 4, some interaction is seen between the two controls. This control Interaction prevents extreme imbalance between mid to high response, and assures minimum phase shift through the crossover network. Controls for the Model 15 function in a similar manner. By experimenting with these controls, you may determine which particular settings produce the most pleasing effects for your acoustic environment. SERVICE INFORMATION Speaker system components may be detached from the cabinet by removing appropriate mounting screws. The low-frequency loudspeaker and the network assembly each mount to the cabinet with four screws (see Figure 5). The Model 19 horn/driver assembly is mounted to the upper part of the cabinet with six bolts, which are accessible when the acoustic damper p...

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