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The DD Audio ATC-400 is a 1-channel terminal amplifier specifically designed to replace the terminal on DD Audio LE pre-fabricated enclosures, making it easy to convert them into active versions. The amplifier can also be used in other enclosures.
Installation is simple: remove the terminal from the LE enclosure and connect the existing internal speaker cables to the ATC-400 speaker wires (we recommend soldering the connections and insulating them with heat-shrink tubing), then screw the amplifier into the enclosure’s terminal opening.
The amplifier features two crossover settings: SUB (30–80 Hz) and FR (80 Hz–25 kHz). The wake-up switch allows you to choose between remote (REM) wire, RCA signal, or high-level DC signal sensing (adapter sold separately). A wired bass level controller is included in the package.
Compatible DD Audio LE enclosures: LE-208.1a, LE-208.3, LE-208.3a-D2, LE-208.3a-D4, LE-210.1a, LE-212.1a, LE-212.2.
- Channels: 1
- Power (RMS @ 4 Ω): 100 W
- Power (RMS @ 2 Ω): 225 W
- Power (RMS @ 1 Ω): 325 W
- Dynamic Power: 500 W
- Operating voltage: 8–16 V
- Test voltage: 14.4 V
- Max current draw: 40 A
- RCA input sensitivity: 0.2–8 V
- S/N ratio: 100 dB
- Damping factor: 150
- THD: 1 %
- Crossover SUB: 30–80 Hz
- Crossover FR: 80 Hz–20 kHz
- Subsonic filter: 30 Hz
- Power cable: 4 AWG
- Speaker cable: 12 AWG
- Dimensions (W×H×D): 74.5 × 95.5 × 52.2 mm
- Weight: 0.91 kg