• 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-4.450 is a compact and lightweight 4-channel power amplifier for fixed installations. In a 1U rack space it delivers 4x 450 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                300 W

Output per Channel into 4 ohms at 1 kHz                    450 W

Output per Channel into 2 ohms at 1 kHz                 675 W

Bridge Output into 8 ohms at 1 kHz                 900 W

Bridge Output into 4 ohms at 1 kHz                  1350 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                   550 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                5.2 kg (11.464 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