A2500.5D ALPHA 2500 Watt Amplifier

Hifonics ALPHA Super D-Class® Hybrid 5 Channel Amplifier.

$ 369.99

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SKU: 806576228837 Category:

The Hifonics ALPHA A-2500.5D amplifier is a 5 channel amplifier with a hybrid of Full Range Super D-Class® and Super D-Class® Technologies with electronic crossovers. Bass remote included.

Weight 10 lbs













1 Year

Compatible Vehicles


Amp Class

Full Range Super D-Class®, Super D-Class®

Amp Total Channels


Amp Max Power (watts)


Amp Power @ 1 Ohm (ch x watts)

1 x 750 (CH5 only)

Amp Power @ 2 Ohms (ch x watts)

4 x 100 + 1 x 450

Amp Power @ 4 Ohms (ch x watts)

4 x 60 + 1 x 250

Amp Crossover


Amp Variable High Pass Crossover 12dB per Octave

CH1 & CH2: 10Hz-250Hz, CH3 & CH4: 10Hz-250Hz

Amp Variable Low Pass Crossover 12dB per Octave

CH5: 50Hz-250Hz

Amp Tone Control / Parametric EQ

Bass EQ

Amp Bass Boost

0-12dB @ 45Hz

Amp Variable Voltage


Amp Signal to Noise

> 85dB

Amp Frequency Response

CH1-4: 10Hz-250Hz, CH5: 50Hz-250kHz

Amp Total Harmonic Distortion (THD)

< 0.05%

Amp Speaker Level Audio Inputs


Amp Power Terminal 12v/GND


Amp Speaker Terminal Wire Gauge

CH1-4: 18 AWG, CH5: 16 AWG

Amp Fusing

Use Extermal Fuse

Additional Details TURN ON CIRCUIT (CH1-4 only): Switched - Remote Turn-On / Signal Sense On, HEATSINK SIZE: Length 13.0in x Depth 9.25in x Height 2.37in
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Low Noise Preamplifier Circuit

Maximum low voltage signal from the source unit comes into the amplifier through a low voltage circuit which delivers minimal distortion through the amplification process.

RCA Inputs

Nickel plated RCA connectors for audiophile signal quality and maximum signal throughput with minimum distortion and maximum external noise rejection.

Operation Mode

Flexible installation allows this amplifier to run in four channel or mono mode simultaneously.

Crossover Type

Accu-Cross crossovers allow for complete control of the signal directing to all speakers. See specifications section for specific frequencies.

Electronic Equalizer

Control of amplifier output with on board electronic crossover to tailor specific frequencies to speakers and subwoofers. Check specifications for specific frequencies for this amplifier.

Class / Topology

Developed over 4 decades of engineering to deliver the highest level of sound quality and power efficiency. Hifonics ALPHA Super D-Class® and Full Ranger Super D-Class hybrid Five Channel topology results in lower distortion, higher current efficiencies and less heat than conventional amplifier designs.

Output Device Technology

The Ultra-Fi™ MOSFET is designed for music production vs just electronics output power. It produces very musical high power with high efficiency for cooling and minimal distortion.

Heat Sink

Heavy duty aluminum alloy heat-sink efficiently moves heat from the MOSFET where it can be cooled.

Power Supply

The Twin Turbo Coil PS is a Pulse Width Modulated power supply keeps voltage constant through the Ultra-Fi output devices.

Output Connections

Nickel-plated, high temperature impact resistant with hex screw terminals that allow for secure connections and is erosion resistant.

Connection Type

Secure connection for all power, ground and speaker connections. Angled for ease of access during installation.

LED System Protection Circuitry Diagnostics

Monitor overload and speaker short protection with illuminated indicators on the amplifier end panel.

Bass Remote Included

HFR-31 (CH 5 only): Wired Bass Remote allows adjustments to bass frequencies from the control which can be mounted anywhere in the vehicle. Smooth potentiometer and ringed illumination in a satin black mount create a custom look.

Full Range Digital

Full Range Super D Class, high efficiency/high power technology to deliver maximum wattage. With this focus on engineering, big sound while remaining very musical in a compact chassis is the result.

SMT Inside

With Surface Mount Technology the typical "through-hole" placement and the larger tolerances from human placement is dramatically improved. In addition, circuit engineers can design better circuits for power and sound quality as the tolerances of SMT components are superior to larger "through-hole" components. Because of their lower mass SMT components withstand shock and vibration making them perfect for audio designed for all vehicles.

Additional Features

300KHZ HIGH SPEED PULSING: The switching speed of the Class D chip puts the amplifier sampling frequencies at over 100 times higher than human ears can hear. This means that the amplifier and the very fast digital switching remains un-hearable in the audio bandwidth for music.

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Hifonics ALPHA Amplifiers (A) Quick Start Guide (Rev3)

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Hifonics Autosense Technical Guide (Rev3)