• 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.

Specifications

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 (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                  5.8 kg (12.787 lb)

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 (104 °F)

Minimum Ambient Temperature                -15 °C (5 °F)

Maximum Surface Temperature              70 °C (158 °F)

Included Items

Included Cables              IEC cable

Included Accessories              Rubber feet