Is the RD1000/1 worth it over a cheaper no-name amp?

For most buyers, yes. You get a known brand, honest power ratings and dealer support, which matters for a part that lives in a hot, vibrating trunk. A cheaper amp can work, but its 1,000-watt claim is often peak rather than RMS.

How much power does it make at 2 ohms and 4 ohms?

Expect roughly 600 watts RMS at 2 ohms and 400 watts RMS at 4 ohms, against 1,000 watts at 1 ohm. Match your subwoofer's impedance to the power you actually need.

What subwoofers work with this amp?

It suits one or two subwoofers with a combined 1-ohm final load for full output, or a 2-ohm load for a more conservative setup. Check the sub's RMS rating and set gain so the amp does not exceed it.

Do I need a second battery or a bigger alternator?

At full 1-ohm output, yes, plan on upgraded wiring and a charging system that can supply the current. On a stock electrical system, run it at 2 ohms or keep the gain low.

The amplifier, mounting hardware and a basic manual. You supply the power and ground wiring, fuse, RCA cables and speaker wire.

Car-audio amps commonly dip during holiday sales and end-of-season clearances. Track its price history here and buy when a store drops below its recent range.

JL Audio RD1000/1 Monoblock Amplifier

Last price we saw

$924.96last seen Oct 29

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Our take on the JL Audio RD1000/1 Monoblock Amplifier

The JL Audio RD1000/1 is a class-D monoblock car amplifier rated at 1,000 watts RMS into 1 ohm, with lower outputs at 2 and 4 ohms. It is a single-channel bass amp with a built-in low-pass crossover, subsonic filter and bass boost, made for driving one or more subwoofers. It sits in JL's value RD line rather than the premium Slash series, so it skips some of the regulated power and tuning features of the more expensive amps. No current price data is available for this listing, so compare store prices before buying.

Best forSubwoofer-heavy systemsDrivers who want one amp for one or two subsBudget builds that still want a known car-audio brand