Apogee APL-10 Spécifications télécharger pdf (Page 19)

as well as by convection; and secondarily, by a small degree of air movement

generated by the cone drivers.

Because the heat output of the system is directly proportional to the dura-

tion and nature of the program material, the system may not reach thermal

stability for several hours after it is activated. For this reason, it is important

to test the system under actual conditions of use if questionable conditions

are present. Questionable conditions include:

(a) ambient temperature at or above the maximum rating

(b) intense sunlight or artificial light shining on the heat exchanger

(d) combinations of the above

Here’s a hypothetical example of what to look out for. An APL-12

might be set up outdoors in 85°F (29°C) temperature with sunlight shining

partially on the rear panel. Let’s assume it is tested during a 30-minute sound

check and all is well. Later that day, the ambient temperature rises to 99°F

(37°C) and the sunlight is now shining directly on the rear of the loudspeak-

er.The show starts, featuring dance tracks with no pause between song titles.

Under such extreme conditions, it is entirely possible that after a period of

service, the loudspeaker will shut off to protect itself from excessive heat.

Problems, such as the one described above, can be avoided by shading the

heat exchanger from direct sunlight.

(1) Basic Concept

The APL-10, -12, and -SB use a highly-advanced signal processor contained

entirely within the unit. The processor provides the functions of an asym-

metrical electronic crossover (36 dB/octave low-pass and 24 dB/octave high-

pass), fixed equalization to compensate for driver/enclosure anomalies, and

advanced protective limiting circuits. It also provides a low-frequency align-

ment circuit that acts synergistically with the enclosure’s ports.This serves to

extend the bass response well below that of a conventional enclosure of a

similar size. All circuits in the audio path utilize the highest quality, most up-

to-date semi-conductor technologies available today.

The processor is the key to the extraordinary sound quality of the loud-

speaker system. Unlike generic crossovers, either digital or analog, the APL

processor was carefully designed in tandem with the drivers and the

enclosure, to provide optimum performance.

(2) Driver Protection

Apogee APL-Series speakers utilize a specialized, highly-evolved Command

Signal Processing

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Apogee APL-10 Spécifications Page 19