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Deal.ai › Hifonics › 4 Channel Car Amplifiers
Hifonics
Hifonics HCM-800.4D 800 Watt 4-Channel Car Stereo Amplifier Class D Compact Amp Black

Hifonics HCM-800.4D 800 Watt 4-Channel Car Stereo Amplifier Class D Compact Amp Black

Best price now

$134.95at WalmartChecked 1 h ago

46% under what the other stores charge

Compared across 11 stores. Prices are checked against each store and labelled with when.

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Price facts

  • Lowest price today: $134.95 at Walmart (checked Nov 12, 2026).
  • Checked at 11 stores.

Our take on the Hifonics HCM-800.4D 800 Watt 4-Channel Car Stereo Amplifier Class D Compact Amp Black

The Hifonics HCM-800.4D is a compact four-channel Class D car amplifier rated at 800 watts max. It puts out 4 x 100 watts at 4 ohms, 4 x 200 watts at 2 ohms, and 2 x 400 watts bridged, in a chassis about 10.5 by 5.3 by 2.7 inches and 4.4 lbs. Its small footprint suits motorcycles, UTVs and tight car installs where a full-size amp will not fit. Against larger four-channel amps it trades some headroom and clean-power margin for size, but it keeps useful tuning: variable high- and low-pass crossovers, a bass control, speaker-level inputs and a 0.2-5V input range.

Best forMotorcycle and UTV audio buildsTight spaces behind a dash or seatPowering four speakers or two bridged subsBudget-minded first system
Pros
  • Very small, light chassis for the power rating
  • Runs 2-ohm stereo and 4-ohm bridged loads
  • Variable high- and low-pass crossovers plus bass control
  • Speaker-level inputs work with factory radios
  • External 80A fusing and 4 AWG power terminals
Cons
  • 800 watts is a max rating, not RMS
  • Class D design can be less forgiving of poor installs
  • No DSP or detailed EQ beyond bass control
  • Small heat sink leaves little margin for abuse

Hifonics HCM-800.4D 800 Watt 4-Channel Car Stereo Amplifier Class D Compact Amp Black prices at every store

  • WalmartNew

    In stockSold by Audiosavings

    $134.95Free shippingChecked 1 h ago
    Visit Walmart
  • East Car AudioNew

    In stock

    $249.99+ $15.00 shippingChecked 1 h ago
    Visit East Car Audio
  • AmazonNew

    Availability unknown

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

    $134.95Free shippingChecked 1 h ago
    Visit Amazon
  • AudiosavingsNew

    Availability unknown

    $134.95Checked 1 h ago
    Visit Audiosavings
  • eBayNew

    Availability unknownSold by audiosavings

    $134.95Checked 1 h ago
    Visit eBay
  • SonicElectronix.comNew

    Availability unknown

    $249.99Checked 1 h ago
    Visit SonicElectronix.com
  • AVLeaderzNew

    Availability unknown

    $249.99Checked 1 h ago
    Visit AVLeaderz
  • Online Car StereoNew

    Availability unknown

    $249.99Checked 1 h ago
    Visit Online Car Stereo
  • Audio JamNew

    Availability unknown

    $249.99Checked 1 h ago
    Visit Audio Jam
  • Fuego Bass ShopNew

    Availability unknown

    $249.99Checked 1 h ago
    Visit Fuego Bass Shop
  • HifonicsNew

    Availability unknown

    $249.99Checked 1 h ago
    Visit Hifonics

Also available at

  • WalmartCheck price at Walmart

Store links may earn us a commission.

Hifonics HCM-800.4D 800 Watt 4-Channel Car Stereo Amplifier Class D Compact Amp Black price history

Lowest price we've seen: $134.95 on Nov 12 at Walmart. Tracked across 11 stores since Nov 12.

About the Hifonics HCM-800.4D 800 Watt 4-Channel Car Stereo Amplifier Class D Compact Amp Black

The Hifonics HCM-800.4D is a Colossus Mini four-channel amplifier that delivers 800 watts in a small, ultra-compact body. Its size suits motorcycles, UTVs and cars. It uses a full-range Class-D chipset, which works with a wide range of drivers, including pro-style speakers.

It runs in stereo or mono bridged mode. Controls include a variable electronic 12 dB per octave crossover and built-in bass control. Its LED shows green when the amp is on and red when it is in protect mode.

The amp has a mass-loaded extruded aluminum heat sink and needs no cooling fan. Over/under voltage, short circuit and thermal protection circuits guard the amp and the vehicle. A delayed turn-on function helps prevent hisses and pops when the amp turns on or off. Inputs are nickel-plated RCA jacks, and the power, ground and speaker connections use an angled, molded terminal.

Series
Colossus Mini
Color
Black
Channels
4
Amp class
Super D-Class, full-range Class-D
Max power
800 watts
Power at 4 ohms
4 x 100 watts
Power at 2 ohms
4 x 200 watts
Bridged power
2 x 400 watts at 4 ohms (mono bridged)
Crossover
Variable electronic, 12 dB per octave
High-pass filter
15 Hz to 1 kHz
Low-pass filter
30 Hz to 250 Hz
Tone control
Built-in bass control
Input voltage
0.2 to 5 V
Inputs
RCA jacks (nickel-plated); speaker-level inputs
Frequency response
10 Hz to 25 kHz
Signal-to-noise
Greater than 85 dB
THD
Less than 0.5%
Power terminal
4 AWG
Speaker terminal
12 AWG
Fusing
External 80A
Protection
Over/under voltage, short circuit and thermal
Cooling
Aluminum heat sink, no fan
Dimensions
10.5 x 5.28 x 2.72 in (length x width x height)
Weight
4.4 lbs
Compatibility
Universal
Warranty
1 year
In the box
Amplifier, bass remote

Specifications

color
BlackSource

Questions and answers

Is the 800 watts RMS or peak?
It is a max power rating. The published figures are 4 x 100 watts at 4 ohms, 4 x 200 watts at 2 ohms and 2 x 400 watts bridged at 4 ohms.
Can it run four speakers and a sub?
No. It has four channels, so you can power four speakers, or bridge two pairs to run two subs, but not both at once without adding another amp.
Will it work with a factory radio?
Yes. It has speaker-level inputs and accepts input signals from 0.2 to 5 volts, so a stock head unit can feed it.
What gauge wiring does it need?
Power and ground terminals take 4 AWG wire, speaker terminals take 12 AWG, and it uses an external 80A fuse.
How big is it?
The chassis is about 10.5 inches long, 5.3 inches wide and 2.7 inches tall, and it weighs 4.4 lbs.
Does it have a crossover?
Yes. It has variable electronic crossovers at 12dB per octave: high-pass from 15Hz to 1kHz and low-pass from 30Hz to 250Hz, plus a built-in bass control.
Where is the Hifonics HCM-800.4D 800 Watt 4-Channel Car Stereo Amplifier Class D Compact Amp Black cheapest?
At Walmart, for $134.95, 46% under what the other stores charge, as of our latest check.
Where can I buy the Hifonics HCM-800.4D 800 Watt 4-Channel Car Stereo Amplifier Class D Compact Amp Black?
11 stores we checked sell it, including Walmart, Amazon, Audiosavings, eBay, East Car Audio.

Stores we've priced the Hifonics HCM-800.4D 800 Watt 4-Channel Car Stereo Amplifier Class D Compact Amp Black at

  • Audiosavings deals and prices
  • AVLeaderz deals and prices
  • East Car Audio deals and prices
  • SonicElectronix.com deals and prices
  • Walmart deals and prices

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