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The core processor for the AFC system is AFC2. As shown in the block diagram, the AFC system consists of at least two AFC2 units, one of which is used for signal processing including Mixing, EMR, fluc-FIR, PEQ and Notch filter and another which is used for output control including Compressor and a delay-level matrix. The system has 8 ch input and 16 ch output, and the output of the total system can be expanded to 112 ch by connecting four AFC2 units for output control to one AFC2 unit for signal processing with cascade cables.
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CAD Data (zip 1253KB)
For the reverberation enhancement, microphones are fixed to, or hung from, the ceiling. They are used to get a diffused sound at or around the critical distance from a representative source point. Speakers face horizontally or upwards, more than the critical distance away from the audience area to make its sound part of the diffuse field. This makes AFC effective anywhere in the room for both the sound source and receiver positions.
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The base unit digital processor is the core unit for AFC system. The system consists of at least two units. The first processor includes the following fixed-architecture processing blocks: Input Mixer, Electric Microphone Rotator (EMR), Reflector with fluc-FIR, 8 band PEQ, and Notch filter. This unit has eight AFC microphone inputs, and flexible Auxiliary inputs up to 16 ch. The AFC function controls the EMR, fluc-FIR, 8 band PEQ, and Notch filter. The second unit includes fixed architecture processing blocks for a 4 x 16 Level-Delay Matrix and a 8 band PEQ for the 16 output channels. The LD Matrix allows routing from any input to any output. Level and Delay parameters are variable at each cross point. These are possible to individually mute all inputs and outputs. It is possible for the installer to expand the base unit’s total outputs to 16 output ports via two mini YGDAI slots. I/O cards for the YGDAI slots accept a variety of analog and digital I/O configurations (AES/EBU, ADAT, TASCAM). Total output channels are expandable up to 112 channels by cascading five processors. AFC system on/off, up to 999 presets and continuous liveness control are retrievable via the dedicated control panel, ICP1, 16 GPI inputs and ouputs, or RS-232C serial ports.
With AD8HR and MY8-DA96, the digital processor has a maximum input level of +30 dBu and a maximum output level of +18 dBu. The frequency response is +1 to -3 dB between 20 Hz and 20 kHz. The dynamic Range is greater than 110 dB (typical, Gain +10 dB) and THD is less than 0.01 % at 1 kHz, +10 dBu. The input impedance is 3 k ohms. The output impedance is 150 ohms. Inputs and outputs are balanced type on XLR connectors.
Architect & Engineers Specification
System Configuration (Example)
Example of Control System
Front panel
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Rear panel
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| Sampling frequency rate |
Internal :44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz
| External : |
39.69 – 50.88 kHz (Normal Rate) |
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79.39 – 101.76 kHz (Double Rate) |
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| Signal Delay@96 kHz |
0.85 msec (Input of MY8-AD96 to Output of MY8-DA96) |
| Memory |
Scene: 999 (depends on size of data) |
| Display |
160 x 64 dot matrix LCD with backlight |
| Scene No. |
7-segment LED x 3 |
| Indicators |
Wordclock: EXT.CLOCK, 96 kHz, 88.2 kHz, 48 kHz, 44.1 kHz
External Control: NETWORK, MIDI
Zone Configuration: Master |
| Power Consumption |
80 W |
| Dimensions |
480 x 145 x 411.5 mm, 3 U |
| Weight |
9.5 kg |
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Speakers designed for Active Field Control system
AFC speaker has wide dispersion so that feedback process works effectively and listener can hardly localize the sound from the enhancement speakers. The specification of the speaker is effective for "natural changes" of the AFC system.
Enclosure Type and Driver Type
- Enclosure type is mainly used for wall mounting
- The enclosure is finished with paintable black
- Driver type is used for the ceiling with the speaker can which is selected by a contractor depending on architectural requirements.
- The Driver type is fit to standard speaker cans introduced by many manufacturers
Model Name
- Enclosure: S8AFC
- Driver: S8AFC-D
8" Coaxial two way (same driver for both type)
Build in Crossover Network
Bare screw connector
Mounting hardware form Allen Products is available
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| Model |
S8AFC |
S8AFC-D |
| Type |
8" coaxial Two way Acoustic suspension |
| Nominal Impedance |
8 ohms |
| Frequency Range |
55 Hz to 20 kHz |
| Sensitivity |
88 dB 1 m/1 W |
| Crossover |
7 kHz |
| Power Capacity |
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Noise |
30 W(EIA RS-426) |
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Program |
60 W |
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Max |
120 W |
Dimensions
(W x H x D) |
16.9 " x 9.5 " x12.5 "
430.5 x 241.5 x 318 mm |
Diameter 8.3 " x Depth 5.1 "
R 210 x D 130 mm |
| Weight |
14.3 lb
6.5 kg |
3.2 lb
1.45 kg |
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Copyright (C)2009 Yamaha Corporation. All rights reserved.
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