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Deal.ai › Hifonics
Hifonics
Hifonics A800.4D 800 W Max 4-Channel Class-D Full Range Car Audio Amplifier

Hifonics A800.4D 800 W Max 4-Channel Class-D Full Range Car Audio Amplifier

Best price now

$112.42at AmazonChecked 7 h ago

49% under what the other stores charge

Compared across 14 stores. Prices are checked against each store and labelled with when. Store links may earn us a commission. As an Amazon Associate, Deal.ai earns from qualifying purchases.

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Price facts

  • Lowest price today: $112.42 at Amazon (checked Nov 13, 2026).
  • Checked at 14 stores.

Our take on the Hifonics A800.4D 800 W Max 4-Channel Class-D Full Range Car Audio Amplifier

The Hifonics A800.4D is a compact Class-D four-channel car amplifier from the Alpha series. It is 1-ohm stable and rated at 800 watts max, with 100 watts per channel at 4 ohms. Its small chassis and full-range design suit door speakers, components or a bridged subwoofer, and it costs far less than premium four-channel amps. Owners of budget Class-D amps often note that max ratings are peak figures, so check the RMS output before matching it to speakers.

Best forBudget four-speaker upgradesDrivers who need a small-footprint ampRunning front components and a subFirst-time amp installs
Pros
  • Compact Class-D chassis fits tight spaces
  • Four channels run door speakers or bridge to a sub
  • 1-ohm stable for flexible subwoofer wiring
  • Full-range design covers mids and highs
  • Simple controls for gain and crossover
Cons
  • 800 W is a peak rating, not RMS
  • Class-D amps can add hiss at low volume
  • No DSP or advanced tuning
  • Budget amp, so build and terminals are basic

Hifonics A800.4D 800 W Max 4-Channel Class-D Full Range Car Audio Amplifier prices at every store

  • eBayNew

    In stockSold by audiosavings

    $112.42Free shippingChecked 7 h ago
    Visit eBay
  • CybervalueNew

    In stockReturn policy

    $222.50Checked 7 h ago
    Visit Cybervalue
  • HifonicsNew

    In stock

    $222.50Checked 7 h ago
    Visit Hifonics
  • DBs Car AudioNew

    In stock

    $222.99Free shippingChecked 7 h ago
    Visit DBs Car Audio
  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $112.42Free shippingChecked 7 h ago
    Visit Amazon
  • Designer-Motorsports.comNew

    Availability unknown

    $219.99Checked 7 h ago
    Visit Designer-Motorsports.com
  • The Wires ZoneNew

    Availability unknown

    $222.50Checked 7 h ago
    Visit The Wires Zone
  • AudiosavingsNew

    Availability unknown

    $222.50Checked 7 h ago
    Visit Audiosavings
  • Online Car StereoNew

    Availability unknown

    $222.50Checked 7 h ago
    Visit Online Car Stereo
  • Hour LoopNew

    Availability unknown

    $222.50Checked 7 h ago
    Visit Hour Loop
  • Absolute USANew

    Availability unknown

    $225.99Checked 7 h ago
    Visit Absolute USA
  • East Car AudioNew

    Availability unknown

    $239.99Checked 7 h ago
    Visit East Car Audio
  • AutoplicityNew

    Availability unknown

    $266.69Checked 7 h ago
    Visit Autoplicity
  • Newegg.comNew

    Availability unknownSold by JMDesign

    $311.99Checked 7 h ago
    Visit Newegg.com

Store links may earn us a commission.

Hifonics A800.4D 800 W Max 4-Channel Class-D Full Range Car Audio Amplifier price history

Lowest price we've seen: $112.42 on Nov 13 at eBay. Tracked across 13 stores since Nov 13.

About the Hifonics A800.4D 800 W Max 4-Channel Class-D Full Range Car Audio Amplifier

The Hifonics A800.4D is a compact Class-D four-channel full-range car amplifier from the Alpha series. It is 1-ohm stable and delivers 800 watts of total maximum power. It uses a pulse width modulated MOSFET power supply and a heavy-duty aluminum alloy heat sink.

It can run in four-channel mode or as a bridged two-channel amplifier. Accu-Cross crossovers let you control the signal sent to each speaker. Preamp RCA outputs allow you to daisy chain multiple amps. A wired remote bass level control is included.

Three-way protection circuitry covers thermal, overload and speaker short faults. A green LED shows power and a red LED shows protect status.

Type
Class-D 4-channel full-range car amplifier
Total power
800 W max
Power at 4 ohms
100 W x 4 channels
Power at 2 ohms
200 W x 4 channels
Bridged power
400 W x 2 channels at 4 ohms
Impedance
1-ohm stable
Frequency response
10 - 250 Hz
THD
<1%
Signal-to-noise
>95 dB
Crossover modes
4CH / 2CH: DUPE / FULL / HPF; Bandpass: LPF / FULL / HPF
High-pass crossover
Variable, 20 Hz - 4 kHz (DUPE mode: 10 Hz - 4 kHz)
Low-pass crossover
Variable (DUPE mode), 50 Hz - 4 kHz, 12 dB/octave
Bass boost
0 - 12 dB at 45 Hz
Outputs
Preamp RCA outputs
Protection
Thermal, overload and speaker short
Indicators
Green LED (power), red LED (protect)
Power terminal
12V/GND: 8 AWG, 24 AWG
Fusing
External fuse required
Included
Wired remote bass level control
Dimensions
13.62" W x 5.75" D x 2.37" H
Weight
7 lbs

Questions and answers

Is 800 watts RMS or peak?
It is a max (peak) rating. Expect roughly 100 watts per channel at 4 ohms, and less than the headline figure in real music use.
Can it run a subwoofer?
Yes. Bridge two channels to drive a sub, and the 1-ohm stability gives you wiring options for dual-voice-coil subs.
Does it fit behind a seat or in a small car?
Class-D amps run cool and take little space, so it mounts in tight spots like under a seat or in a trunk corner.
What speakers should I pair it with?
Match speakers to its per-channel RMS output, not the 800 W max. It suits typical 4-ohm door and component speakers.
Do I need a line output converter?
Only if your head unit has no RCA preouts. With preouts, run RCA cables straight to the amp.
What comes in the box?
The amplifier and its mounting hardware. You supply the power and speaker wiring, fuse and RCA cables.
Where is the Hifonics A800.4D 800 W Max 4-Channel Class-D Full Range Car Audio Amplifier cheapest?
At Amazon, for $112.42, 49% under what the other stores charge, as of our latest check.
Where can I buy the Hifonics A800.4D 800 W Max 4-Channel Class-D Full Range Car Audio Amplifier?
14 stores we checked sell it, including Cybervalue, Amazon, eBay, Designer-Motorsports.com, Hifonics.

Stores we've priced the Hifonics A800.4D 800 W Max 4-Channel Class-D Full Range Car Audio Amplifier at

  • Absolute USA deals and prices
  • Audiosavings deals and prices
  • Autoplicity deals and prices
  • Designer-Motorsports.com deals and prices
  • East Car Audio deals and prices
  • Hour Loop deals and prices
  • Newegg deals and prices
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