DAP SI-4.900 4x 900 W install amplifier

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-4.900 is a compact and lightweight 4-channel power amplifier for fixed installations. In a 1U rack space it delivers 4x 900 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.

Outputs
2 ohms Stable                            Yes
Output per Channel into 8 ohms at 1 kHz  600 W
Output per Channel into 4 ohms at 1 kHz  900 W
Output per Channel into 2 ohms at 1 kHz  1350 W
Bridge Output into 8 ohms at 1 kHz       1800 W
Bridge Output into 4 ohms at 1 kHz       2700 W
Output Channels                          4
Output Mode                              4-channel, Bridge, Mono, Parallel, Stereo
Output Connector                         Speaker Connector 4 pole

Inputs
Mono Inputs                              4
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
Width (mm)                               483 mm
Length (mm)                              296 mm
Installation Depth (Excl. Connector)     296 mm
Flightcase Size                          19"
Rack Units                               1 U
Housing                                  Steel
Colour                                   Black
Finish                                   Powder Coating
Weight                                   5.8 kg
IP Rating                                IP20 (indoor use only)

Product Properties
Electronic Protection                    Clip limiter, DC voltage, Overheat, Overload, Under voltage
LED Indicators                           Clip, Power, Protect, Signal

Thermal Specifications
Maximum Ambient Temperature              40 °C
Minimum Ambient Temperature             -15 °C
Maximum Surface Temperature              70 °C

Included Items
Included Cables                          IEC cable
Included Accessories                     Rubber feet