How much power does the RD900/5 make?

It is rated 70 W per channel at 4 ohms and 100 W at 2 ohms on the four main channels, 200 W bridged at 4 ohms, plus a dedicated subwoofer channel.

Can it run a whole system on its own?

Yes. Four channels cover front and rear speakers and the fifth drives a subwoofer, so one amp handles a typical four-speaker-plus-sub build.

No. JL Audio does not rate this model for marine use; choose a marine-rated amp for boats.

Yes. It has high-pass and low-pass filters so you can tune each channel group without extra processors.

Yes. The main channels bridge to 200 W at 4 ohms for speakers that need more power.

It accepts AGU or AFS fuses, so check your wiring kit matches before installing.

At Abt Electronics, for $679.99, as of our latest check.

$679.99at Abt ElectronicsChecked Nov 8

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