Manual JBL Project K2 S9900 (page 11 of 42) (English, All languages)

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Project K2 S9900

CHAPTER 2

The Project K2 S9900 Loudspeaker – a Triumph in Acoustics and

Technology

The following sections describe the primary features and components of the

Project K2 S9900 loudspeaker system.

The basic system conﬁguration is what has been referred to historically as an

augmented two-way. In the 1950s and 1960s, JBL engineers primarily built

two-way systems with a 12- or 15-inch (300mm or 380mm) woofer crossed over

to a large-format compression driver/horn combination. Some of the systems

would be “augmented” by a UHF device, usually the 075 ring radiator which

would operate above 8kHz. These systems would have only a single crossover

point in the middle of the audio range, to minimize any sonic degradation

caused by the dividing network. The K2 S9900 has a single midrange crossover

at 900Hz, blending one 1500AL-1 woofer to the 476Mg compression driver and

horn combination. The 045Be-1 UHF driver is brought in at 15kHz to cover 2

octaves of ultrasonic frequencies. Above 900Hz, the HF compression driver and

horn combination operates unassisted, all the way to 20kHz (Fig. 1).

Figure 1. On-axis response of the K2 S9900 system and of each of the

transducers through its crossover network (2.83V @ 1m).

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JBL Project K2 S9900 Manual

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