Is 800 watts RMS or peak?

It is a max rating. Real output is 4 x 100 watts at 4 ohms, 4 x 200 watts at 2 ohms, or 2 x 400 watts bridged at 4 ohms.

Can it run four speakers and a subwoofer?

It has four channels. Bridge two channels for a sub and use the other two for speakers, or run four speakers and add a separate sub amp.

Does it need an external fuse?

Yes. The amp has no onboard fusing, so install an external fuse on the power wire near the battery.

Will it work with a factory radio?

Yes. It accepts speaker-level inputs, so it can take signal from most stock head units.

What size power wire does it take?

The 12V and ground terminals accept up to 4 AWG wire.

Can I bridge it to two channels?

Yes. Bridged at 4 ohms it produces 2 x 400 watts, useful for a subwoofer or two powerful speakers.

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

Q: Where is the Hifonics A800.4D ALPHA Series 4-Channel 800W Max Class-D Full Range Car Amplifier cheapest?

At Amazon, for $112.42, 49% under what the other stores charge, as of our latest check.

Q: Where can I buy the Hifonics A800.4D ALPHA Series 4-Channel 800W Max Class-D Full Range Car Amplifier?

13 stores we checked sell it, including Amazon, eBay, Designer-Motorsports.com, Hifonics, The Wires Zone.

Best price now

$112.42at AmazonChecked 7 h ago

49% under what the other stores charge

Compared across 13 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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About the Hifonics A800.4D ALPHA Series 4-Channel 800W Max Class-D Full Range Car Amplifier

The Hifonics A800.4D ALPHA is a compact 4-channel car audio amplifier with Full Range Super D-Class circuitry. It is rated at 800 watts max and uses Ultra-Fi MOSFET output devices for high power, efficient cooling and low distortion. A heavy-duty aluminum alloy heat sink moves heat away from the MOSFETs.

It runs in four-channel or bridged mono mode. Onboard electronic crossovers and a bass EQ let you tailor the signal for speakers and subwoofers. Inputs are nickel-plated RCA connectors, and it also has speaker-level inputs. The Auto Turn-On feature detects a voltage rise on the high-level inputs and switches the amp on with the source unit, so the remote turn-on wire is not needed. It works with most source units that have high-power outputs.

The power, ground and speaker connections use nickel-plated hex screw terminals, angled for easy access during installation. LED indicators on the end panel show overload and speaker short protection. Surface Mount Technology circuit construction is used inside, and the amplifier's 300 kHz switching speed keeps it outside the audible range.

Brand

Hifonics

Series

ALPHA

Type

Mobile (car audio) amplifier

Amp class

Full Range Super D-Class

Channels

Max power

800 watts

Power at 2 ohms