UMA™ 4300

4 Channel 300 Watts Mixer Amplifier – Constant Voltage 25V, 70V, 100V & Low-Z


The Crest Audio® UMA™ 4300 mixer amplifier provides nstallers and contractors a simple and efficient solution for a broad range of sound reinforcement, paging and background music applications in retail spaces, restaurants, lounges and waiting rooms.

The UMA 4300 combines a four-input mixer with a highly efficient Class D 300 Watts mono amplifier. Each of the four inputs can handle a variety of input signals, including microphone, balanced line level and mono or stereo unbalanced line sources. The UMA 4300 provides a simple paging solution with priority mute level sensing controls on input 1. Inputs 1 and 2 are electronically balanced and provide mic preamp gain controls and switched 48V phantom power for microphones. Inputs 3 and 4 support balanced and unbalanced line inputs with switch selectable Euro-style connectors or dual RCA inputs.

The UMA 4300 can drive directly a low impedance loudspeaker with its 4 Ohms direct output or 25V, 70V or 100V constant voltage loudspeaker circuit.

The UMA 4300 is housed in a 2U rack mount chassis and has a voltage selector switch for 120V or 240VAC operation.

Features UMA 4300

• 300 Watts Class D power amplifier

• SPS speaker protection system

• High-pass filter to protect speaker transformers from low frequency overload

• 2U rack-mount chassis

• Four input level controls with signal/clip/mute LEDs

• Power, signal and SPS indication LEDs

• Master volume

• Four electronically balanced Mic/Line inputs

• Inputs 1 and 2 are electronically balanced with Euro connectors and preamp gain control

• Inputs 1 and 2 have phantom power with switch

• Inputs 3 and 4 have switch to select balanced Euro connector or dual RCA connectors

• Inputs 3 and 4 have rear panel preamp gain controls

• Input 1 Level sensing muting of inputs 2-4 with threshold/defeat control

• Balanced output with level control

• Switchable Mix output or input 4 Direct output

• Output is not affected by mute or channel level if channel 4 is selected

• Preamp output, power amp input for inserting processing with Bypass switch

• 4 Ω, 25V, 70V and 100V outputs

• Bass and Treble controls

• Power switch

• Line voltage switch for 120V or 240VAC operation

Additional information

Channels (Input)


Channels (Output)


Power per Channel @ 4 Ω

300 W

Power per Channel @ 70V

300 W

Power per Channel @ 100V

300 W


Class D

Minimum Load Impedance

4 Ω

Frequency Response

-3 dB, 65 Hz – 20 kHz; +0

Phantom Power

Yes (48V)

Mute Groups

Priority / Mute All

Input Connectors

4 x 3-pin Euro Connector & 2 x Dual RCA

Output Connectors

1 x 5-pin Srew Terminal


Rack Mount (19")

Yes (2U)

Net Weight

15.4 lbs (7.00 kg)

Product Height

3.45" (88 mm)

Product Width

19.00" (483 mm)

Product Depth

13.25" (337 mm)

AC Power Input

Dual Voltage – 120 or 220-240VAC 50/60 Hz



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