| KF920 |
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Last Modified: 2002-07-29
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- Long throw MF Phased PointSource TechnologyT module
- (3) 10 in MF on separate SimplePhaseT horns
- PPSTT systems build arrays for the largest spaces
- Pre-configured DSP defines coverage by integrating cells and modules to fit its application
- P (install) or F (touring) versions available
- Digital signal processor required to achieve specified performance
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| General Application |
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| Touring |
| Portable |
| Install |
Description
The KF920 is a dedicated mid frequency long throw/downfill module engineered for use with Phase PointSource Technology digital signal processing in the creation of PPST arrays. It provides such high output of mid frequency information that care should be taken with its use. Listeners in its immediate nearfield at maximum output may suffer permanent damage to their hearing.
The system comprises three cells each consisting of a specially designed 10-in mid frequency cone loaded on a 30° horizontal coverage SimplePhase horn with phase plug. Vertical coverage is determined by PPST processing.
PPST processing focuses the output of the three cells onto the main axis while providing smooth frequency response and appropriate attenuation at points below the horizontal axis up to -60°. This allows a single KF920 mid frequency module to provide coverage over an area from just 25 feet to over 600 feet from the array.
SimplePhase horns were specially designed to facilitate the PPST process. Horizontal coverage is an idealized 30 degrees over the entire operating bandwidth. Unlike Virtual Array Technology's complex horn flares designed for control of individual drivers, the simple lines of the SimplePhase horns produce phase coherent summation with other drivers within the module.
A toggle switch controls the KF920's only passive filtering which provides appropriate settings for modules located in inner or outer columns. Outboard digital signal processors must provide all other system control.
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Applications
The KF920 PPST long throw/downfill MF module is engineered for use only in KF900 Series arrays implementing PPST digital signal processing. It is not intended for stand alone use of any kind.
With appropriate PPST processing, the KF920 provides a highly focused beam of vertical MF coverage that can project over 600 feet. PPST processing allows the same KF920 to provide downfill coverage with smooth frequency response up to -60° below the horizontal axis.
Applications such as high energy concert tours may require two KF920 modules per column to generate the desire mid range level. In such a case, the specific processor settings for that dual module configuration must be implemented.
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Physical |
| System Configuration |
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Dedicated MF, Long throw/downfill |
| MF Subsystem & Loading |
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3x 10-in horn-loaded cone |
| Operating Mode |
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Active Processing |
| Enclosure Material |
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Baltic birch plywood |
| Finish |
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Wear resistant textured black paint |
| Connector |
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One each male and female AP6 |
| Suspension Hardware |
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(16) 3/8 |
| Grille |
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Vinyl coated perforated steel, |
Dimensions (±0.13 in / ±3 mm) |
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| Height |
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42.00 / 1067 |
| Front Width |
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30.00 / 762 |
| Rear Width |
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8.56 / 217 |
| Depth |
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40.00 / 1016 |
| Trapezoid Angle (degrees) |
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15 |
Weights (pounds / kilograms) |
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| Net Weight |
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308.0 / 140.0
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| Shipping Weight |
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316.0 / 143.6 |
Performance |
| Frequency Response |
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| ±3 db |
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100 Hz to 1270 Hz |
| -10 dB |
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73 Hz to 1400 Hz |
| Recommended High-Pass Frequency |
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100 |
Axial Sensitivity (dB SPL, 1 watt @ 1 m) |
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| MF |
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112 |
Nominal Input Impedance (ohms) |
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| MF |
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3 |
Power Handling (watts, continuous) |
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| MF |
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3x 400 |
Calculated SPL Limit (referenced to 1 m) |
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| MF Peak |
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148.0 |
| MF Long Term |
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143.0 |
| Nominal Dispersion (degrees @ - 6 dB) |
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| Horizontal |
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30° |
| Vertical |
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Beam profile adjustable via PPST processing° |
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