Compact (1U) and lightweight Class D fixed installation amplifier
Lo-Z (2, 4, 8 ohms), mono, stereo and bridge modes
Universal SMPS (100 - 250 V AC) with PFC
The DAP SI-2.1800 is a compact and lightweight 2-channel power amplifier for fixed installations. In a 1U rack space it delivers 2x 1800 W into 4 ohms, is capable of driving 2-ohm loads and can be bridged for even more power. It is designed for low impedance and high current with excellent stability.
It has a clip limiter and DC output protection to prevent damage to the loudspeaker. Output overload and short-circuit protection protects the amplifier from faults, as does over-temperature protection and high-temperature power attenuation.
Signal, Clip, Fault and Power LEDs indicate the status of the amplifier. The output level can be adjusted for each channel using the volume controls. Gain can be set on the rear panel for 0.775 V input or 32 dB gain, and a mode switch selects stereo, mono and bridge modes.
The universal switching power supply uses active PFC and soft-switching technology, accepts input voltages from 100 - 250 V AC and is optimised for the audio power amplifier.
Specifications
Outputs
2 ohms Stable Yes
Output per Channel into 8 ohms at 1 kHz 1200 W
Output per Channel into 4 ohms at 1 kHz 1800 W
Output per Channel into 2 ohms at 1 kHz 2400 W
Bridge Output into 8 ohms at 1 kHz 3600 W
Bridge Output into 4 ohms at 1 kHz 4800 W
Output Channels 2
Output Mode Bridge, Mono, Parallel, Stereo
Output Connector Speaker Connector 4 pole
Inputs
Mono Inputs 2
Mono Input Connector 3-pin XLR
Mono Input Impedance 20000 Ω
Balanced Mono Input Sensitivity 32 dBu
Audio Specifications
THD Level < 0.05 %
Signal-to-noise Ratio > 100 dB
Slew Rate 50 V/μs
Amp Technology Class D
Damping Factor 1000 :1
Crosstalk 75 dBu
Frequency Response Minimum 20 Hz
Frequency Response Maximum 20000 Hz
Electrical Specifications and Connections
Power Supply 100-240 V AC 50/60 Hz
SMPS Yes
Power Consumption 1075 W
Power Connector In IEC
Mechanical Specifications
Height (mm) 45 mm (1.772″)
Width (mm) 483 mm (19.016″)
Length (mm) 296 mm (11.654″)
Installation Depth (Excl. Connector) 296 mm (11.654″)
Flightcase Size 19"
Rack Units 1 U
Housing Steel
Colour Black
Finish Powder Coating
Weight 5.4 kg (11.905 lb)
IP Rating IP20 (indoor use only)
Product Properties
Electronic Protection Clip limiter, DC voltage, Overheat, Overload, Under voltage
