LD Systems AMP 405 - Class D amplifier with 4 channels of 50 W each, designed to power low-impedance speakers in multiple zones. Due to its compact size and included mounting plates, the amplifier can be discreetly installed almost behind screens, under tables, or even in technical spaces and above suspended ceilings.
Alternatively, up to three units can be mounted in a 1/3 19” rack using the optional tray, saving space. Connections via terminal blocks for balanced inputs and outputs to speakers simplify installation, and the optional auto-standby function reduces power consumption in the absence of audio signal.
Features:
- Class-D amplifier 4 × 50 W @ 4 Ohm
- Compact format, 1/3 rack 19”, 1U
- Silent operation with passive cooling
- Compatible with remote control systems (standby)
- External power supply 100–240 V
- Operates in four-channel mode or bridge for two channels @ 100 W in high power mode
- Included mounting plates for flexible and discreet installation, including above suspended ceilings
- Auto-standby function for energy saving
- Four balanced line inputs, with parallel input option
- Four speaker outputs with terminal block connections
- Intuitive front panel with LEDs for signal, clip, and protection
- Optional rack tray for integration with other TICA® series products
Specifications:
Inputs / Outputs:
- Balanced inputs: 4
- Amplified outputs: 4 (with mode selector – Stereo / Parallel / High Power)
- Cooling: Convection
Amplifier Input:
- Nominal sensitivity: 0 dBu (maximum volume)
- Nominal clip: 18 dBu (volume at 9 o'clock)
- Input impedance: 12 Ω
- CMRR: > 48 dB (0 dBu, 1 kHz)
- Input connectors: 4 × 3-pin terminal block (3.81 mm)
Digital / DSP Specifications:
- LPF crossover (CH1–2): 20 Hz – 125 Hz
- HPF crossover (CH3–4): 125 Hz – 20 kHz
- AD/DA resolution: 24 bits
- Sampling rate: 48 kHz
- Latency: < 2 ms
Amplifier Output:
- Type: Class D
- Modes: Stereo, Parallel, High Power
- Output connector: 4-pin terminal block (5.08 mm)
- RMS power:
- 4 × 50 W at 4 Ω (ST, PAR)
- 2 × 100 W at 2 Ω (HPM mode)
- Peak power:
- 2 × 55 W at 4 Ω
- 1 × 110 W at 2 Ω
- Minimum impedance: 4 Ω (ST/PAR), 2 Ω (HPM)
- Frequency response (-1 dB): 20 Hz – 20 kHz
- THD + N: < 0.02 %
- SNR: > 100 dB
- Maximum gain: 22 dB
- Protections: DC, overcurrent, short circuit, overtemperature, undervoltage
External Control:
- External standby control (GPI)
- Standby connector: 2-pin terminal block, pitch 3.5 mm
Power Supply:
- Type: External SMPS
- Input voltage: 100 – 240 V AC
- Secondary voltage: 24 V DC, 5 A
- Secondary connector: 2-pin terminal block (5.08 mm)
- Primary connector: IEC
- Maximum consumption: 230 W
- Idle consumption: 8.5 W
- Standby consumption: < 1 W
General Data/Physical Parameters:
- Auto-standby time: 20 minutes
- Wake-up time from standby: 3 seconds
- Activation threshold: ‑33 dBu
- Materials: Plastic front panel, steel chassis
- Dimensions: 142 × 53 × 222 mm
- Weight: 1.84 kg
- Included accessories: external SMPS, mounting plates, terminal blocks
