Features & Applications
Features
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Applications
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Detailed Description FFA-4004
FFA-4004 provides four amplifier channels for touring and installed sound systems. The published model ratings are 600 W per channel at 8 Ω and 1000 W per channel at 4 Ω. FFA describes full-power operation with all four channels driving 4 Ω loads, supporting multi-way loudspeakers, distributed reinforcement and bi-amplified monitoring.
Amplification and power supply
The amplifier combines FFA’s proprietary Class D PWM output stage with a high-current switch-mode power supply. This arrangement is designed for efficient power conversion with reduced heat generation. Soft start manages the power-supply startup, while a side-chain TCA clip limiter and dedicated protection circuits address clipping, output DC, excessive current, short circuits and temperature.
Each channel has a balanced female XLR input and a parallel male XLR signal link. Neutrik speakON outputs provide the loudspeaker connections; channels 1 and 3 also carry the adjacent channel on pins 2+/2− for compatible four-core bi-amp wiring. Front-panel level controls and signal, clip and protection indicators support operation at the rack.
Operation and installation
The tour-grade aluminium enclosure occupies 2U and has a published model weight of 9 kg. An 80 mm fan moves air from the rear towards the front. FFA identifies smaller full-range speakers, mid/high sections of larger systems, modest bass duties and stage monitors as suitable applications, with the amplifier load and wiring selected for the connected loudspeakers.
Explore Full Fat Audio amplifiers at B-Star and the Full Fat Audio range. Manufacturer references: Manufacturer brochure / overview — FFA-4004 / FFA-6004 (PDF page 1), Manufacturer datasheet — FFA-4004 / FFA-6004 (PDF page 2), FFA amplifier user manual.
Technical Specifications FFA-4004
AMPLIFIER |
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| OUTPUT CHANNELS | 4 |
| POWER PER CHANNEL AT 8 Ω | 600 W |
| POWER PER CHANNEL AT 4 Ω | 1000 W |
| TOTAL RATED OUTPUT AT 4 Ω | 4 × 1000 W |
| VOLTAGE GAIN | 32 dB |
| THD+N | Typical 0.05% at 4 Ω, 1 kHz; percentage unit confirmed by the FFA user manual |
| FREQUENCY RESPONSE | 20 Hz–20 kHz, ±0.5 dB |
| OUTPUT STAGE | FFA Class D PWM |
| POWER SUPPLY | High-current switch-mode supply with soft start |
| LOUDSPEAKER PROTECTION | DC at output; clip limiting using a side-chain TCA circuit |
| AMPLIFIER PROTECTION | Short circuit, current overload, thermal shutdown and high-frequency stability circuit |
| 4 Ω OUTPUT CONFIGURATION | All four channels driven simultaneously, as described on the model page |
CONNECTIONS |
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| ANALOGUE INPUTS | 4 × balanced Neutrik female XLR |
| INPUT WIRING | Pin 1: ground; pin 2: hot (+); pin 3: cold (−) |
| ANALOGUE LINKS | 4 × male XLR parallel signal-through connections |
| LOUDSPEAKER OUTPUTS | Neutrik speakON per channel |
| BI-AMP WIRING | Channels 1 and 3 also use pins 2+/2− for four-core loudspeaker wiring |
| MAINS CONNECTOR | 1 × Neutrik 20 A powerCON |
CONTROLS AND INDICATORS |
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| LEVEL CONTROLS | 40-position potentiometer per channel |
| POWER CONTROL | Power-on switch |
| SIGNAL INDICATOR | Green at −20 dB |
| LEVEL INDICATOR | Yellow at −3 dB |
| CLIP INDICATOR | Red |
| PROTECTION INDICATOR | Red for overcurrent, low AC mains or the 3-second power-up mute |
MAINS POWER AND COOLING |
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| MAINS REQUIREMENT (MODEL SOURCE) | 1 × 16 A, 240 V AC circuit; published operating range 185–230 V AC |
| COOLING | High-airflow 80 mm fan with signal-proportional speed control |
| AIRFLOW | Rear to front |
MECHANICAL |
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| ENCLOSURE | Tour-grade aluminium chassis |
| RACK FORMAT | 19-inch rack; 2U |
| DIMENSIONS H × W × D | 88 × 483 × 510 mm |
| DEPTH REFERENCE | Includes integral rear rack support |
| WEIGHT | 9 kg |
Model-page values are used where the archived shared datasheet or older user manual differs. Refer to the linked model documents for the applicable hardware and mains configuration.
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