Is the 400 watts RMS or max?

It is a max power rating. Real continuous output per channel is much lower, so plan around modest speaker power.

Can it run at 2 ohms?

Yes, it is 2-ohm stable, so you can wire lower-impedance speakers or bridge channels for more output.

How many speakers can it drive?

Four channels drive four speakers, or two bridged pairs for a subwoofer setup.

Does it need a separate power wire?

Yes. Like any car amp it needs a fused power cable from the battery, a ground and a remote turn-on wire.

Is it good for a first system?

It suits a basic four-speaker upgrade. If you want high clean output or subwoofer power, a Class D amp is a better fit.

BOSS Audio Systems R1004 Riot 400 Watt 4 Channel Class A/B Car Amplifier

Best price now

$182.92at WalmartChecked Nov 8

Prices are checked against each store and labelled with when.

Visit Walmart

BOSS Audio Systems R1004 Riot 400 Watt 4 Channel Class A/B Car Amplifier

Best price now

$182.92at WalmartChecked Nov 8

Prices are checked against each store and labelled with when.

Visit Walmart

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Price facts

Last seen at $182.92 at Walmart on Nov 8.

Our take on the BOSS Audio Systems R1004 Riot 400 Watt 4 Channel Class A/B Car Amplifier

The BOSS Audio R1004 is a four-channel Class A/B car amplifier rated at 400 watts max power. It uses a MOSFET power supply and is 2-ohm stable, so it can drive four speakers or bridged pairs. It is aimed at first-time car audio buyers who want more volume than a head unit alone provides. Against name-brand four-channel amps it is simpler and less powerful on paper, and owners report it delivers modest, clean power rather than big output.

Best forFirst-time car audio upgradesPowering four door speakersBudget builds that need a small ampBridged use for a subwoofer pair

Pros

Four channels cover front and rear speakers
2-ohm stable for flexible speaker wiring
Class A/B design
Compact footprint for tight installs
Simple controls for basic tuning

Cons

400 watts is max rating, not RMS per channel
Class A/B runs hotter and draws more current than Class D
Modest build quality reported by some owners
No built-in DSP or advanced tuning

BOSS Audio Systems R1004 Riot 400 Watt 4 Channel Class A/B Car Amplifier prices at every store

WalmartNew
In stockSold by Speece Inc.Returns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
$182.92Free shippingChecked Nov 8
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What reviewers say

3.5 / 5168 ratings

Owners rate it around 3.5 out of 5. Many say it adds volume over a stock head unit for a basic system, while others report it falls short of its power claims and can pick up noise.

What people mention

Power outputMixedSome owners say it is louder than expected; others say it does not deliver the rated watts.
Build qualityCriticisedSeveral owners describe the chassis and terminals as light and basic.
InstallPraisedBuyers say wiring and setup are straightforward for a first amp.
NoiseCriticisedA few report hiss or alternator whine after installation.
HeatMixedClass A/B operation means it warms up; some owners note it runs hot under load.

About the BOSS Audio Systems R1004 Riot 400 Watt 4 Channel Class A/B Car Amplifier

The BOSS Audio Systems R1004 Riot is a 4-channel Class A/B car amplifier with 400 watts of maximum power. It is part of the Riot Series and is designed to boost the sound of a car audio system.

It uses a MOSFET power supply and an integrated circuit (IC) design. The amplifier is full range and 2-ohm stable.

Max power: 400 watts
Channels: 4
Amplifier class: Class A/B
Impedance: 2-ohm stable
Frequency range: Full range
Power supply: MOSFET
Circuit: Integrated circuit (IC)
Series: Riot
Dimensions: 3.62 x 10.75 x 9.5
Color: Black
Boat use: Not suitable for boats

Specifications

actual_color: BlackSource
color: BlackSource
size: 3.62 x 10.75 x 9.5Source
Suitable for Boats: NoSource
No. of Channels

Questions and answers

Is the 400 watts RMS or max?: It is a max power rating. Real continuous output per channel is much lower, so plan around modest speaker power.
Can it run at 2 ohms?: Yes, it is 2-ohm stable, so you can wire lower-impedance speakers or bridge channels for more output.
How many speakers can it drive?: Four channels drive four speakers, or two bridged pairs for a subwoofer setup.
Does it need a separate power wire?: Yes. Like any car amp it needs a fused power cable from the battery, a ground and a remote turn-on wire.
Is it good for a first system?: It suits a basic four-speaker upgrade. If you want high clean output or subwoofer power, a Class D amp is a better fit.
Where is the BOSS Audio Systems R1004 Riot 400 Watt 4 Channel Class A/B Car Amplifier cheapest?: At Walmart, for $182.92, as of our latest check.
What do buyers say about the BOSS Audio Systems R1004 Riot 400 Watt 4 Channel Class A/B Car Amplifier?: Rated 3.5 out of 5 from 168 ratings.