Is the PX1000.4D1 worth it?

If you need a 4-channel amp that holds 1 ohm stereo or 2 ohm bridged, its feature set fits that job. At $316.99 from a single seller as of November 3, 2026, you have no competing price to play against, so compare it with other 1-ohm-stable 4-channel amps before committing.

Can it really run 1 ohm per channel?

Genius Audio USA rates it stable at 1 ohm stereo and 2 ohm bridged. That means each channel can drive a 1-ohm load, or pairs of channels can bridge into 2 ohms. Plan on upgraded wiring and a charging system that can feed the current.

What crossover settings does it have?

Each setup can use high-pass, low-pass or full-range mode, adjustable from 35Hz to 8kHz with a 12dB per octave slope. That covers tweeter protection up top and subwoofer filtering down low.

Does it have a cooling fan?

Yes, it uses a temperature-controlled fan that speeds up as the amp heats up. That helps in tight installs and long low-impedance runs, but the fan is a moving part to keep clean.

What comes in the box?

The listing does not spell out box contents. Expect the amplifier itself; check with the seller about mounting hardware, fuses and the manual before ordering.

Only one store lists it new at $316.99 as of November 3, 2026, so there is no track record of discounts yet. Watch that listing around major sales events.

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PX1000.4D1 Compact 4-Channel Class D Amplifier

−41%

Tech · Genius Audio USA

Four channels of clean power for your car's soundtrack

PX1000.4D1 Compact 4-Channel Class D Amplifier

A compact four-channel Class D amplifier from Genius Audio USA for anyone upgrading their car audio system.

Deal score 5.1 · Good deal

$316.99$539.00 Genius Audio USA's regular price

You save $222.01 at Genius Audio USA

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Why it's a great deal

Genius Audio USA lists its regular price at $539.00: 41% off by its own figures

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From Genius Audio USA

High-power 4-channel Class D full range amplifier for extreme full range car audio systems
Stable at 1 ohm stereo (2 ohm bridged) for advanced installations
HPF, LPF and FULL crossover modes with 35Hz–8kHz range and 12dB slope
Smart cooling fan with temperature control
Protection circuitry: short circuit, low impedance, high/low voltage, DC offset, thermal
Ideal for SPL builds and high-performance daily drivers

Shipping: Free shipping on purchases over a stated minimum; shipping calculated at checkout.

Specs

Number Of Channels: 4-channel
Class: Class D

About the PX1000.4D1 Compact 4-Channel Class D Amplifier

The PX1000.4D1 is a 4-channel Class D car amplifier built for high-output full-range systems. It stays stable at 1 ohm stereo (2 ohm bridged), which lets you run multiple speakers or subs per channel without dropping to a lower-impedance amp. Crossover modes cover high-pass, low-pass and full range from 35Hz to 8kHz at 12dB per octave, and a temperature-controlled fan plus full protection suite handle the heat and fault cases that come with low-impedance loads. Its best new price is $316.99 at Genius Audio USA as of November 3, 2026, with only one store listing it new, so there is no meaningful recent price range to compare against.

Best forSPL builds and competition systemsDaily drivers running multiple speakers per channelOwners who want one amp for front stage and subsLow-impedance 1-ohm stereo or 2-ohm bridged setups

Pros

Stable at 1 ohm stereo and 2 ohm bridged
Full-range Class D design with high-pass, low-pass and full modes
Crossover adjustable from 35Hz to 8kHz at 12dB slope
Temperature-controlled cooling fan
Protection against short circuit, low impedance, voltage faults, DC offset and heat