How to Connect an Amplifier to a Receiver? | Pre-Out Method

To connect an amplifier to a receiver, run RCA cables from the receiver’s pre-out jacks to the amplifier’s line-in, then wire speakers to the amp.

For the full breakdown, see our best Amp For Receiver guide.

The mistake that damages gear isn’t wiring speakers backward—it’s sending speaker-level signal into an amplifier’s line inputs. The standard path is a set of RCA cables from the receiver’s pre-out jacks to the amp’s line-level inputs. When you’re ready to connect an amplifier to a receiver, the rear panel of the receiver decides everything.

Does Your Receiver Have Pre-Outs?

Pre-outs are RCA jacks, usually labeled PRE OUT, that carry an unamplified line-level signal. They’re grouped by channel—FRONT L/R, CENTER, SURROUND L/R—because the receiver acts as a preamplifier while the external amp supplies power to the speakers. The Marantz Cinema 60 manual confirms this setup directly: it states that an external power amplifier can be connected to the unit’s PRE OUT connectors, letting the receiver be used “as a preamplifier.”

Look for a dedicated set of pre-outs before buying anything else. If your receiver has them, you’re minutes from a working connection. If it doesn’t, the direct route is closed—you’ll need the conversion workaround covered below.

Connecting the Amp to the Receiver, Step by Step

1. Power everything off. Unplug the receiver and amplifier from the wall before touching any cables. This is standard practice and protects both units from surge damage.
2. Run one RCA cable per channel. Connect each receiver pre-out to the matching amplifier input: Front Left to front-left input, Center to center, Surround Right to surround-right. White plugs carry left, red carry right—keep them straight or your soundstage will be swapped.
3. Wire speakers to the amplifier’s terminals. The external amp is driving those channels now, so the speakers connect to its outputs, not the receiver’s binding posts.
4. Set the amp’s level controls low. If the amplifier has input-level knobs or gain switches, start at a conservative position to avoid a volume spike on first power-up.
5. Power on receiver first, then amplifier. On shutdown, reverse the order: amp off first, then receiver. This sequence minimizes clicks and pops that can stress speakers.

A 12V trigger cable is optional—if both units have trigger jacks, one mono cable makes them power on together, but it isn’t required for a basic RCA hookup. If your amp has bridge mode, skip it unless the amplifier’s manual explicitly describes your channel configuration. For still choosing an amplifier, our tested roundup of the best amp for receiver pairings covers models that match this setup.

When Your Receiver Lacks Pre-Outs

Without pre-outs, a receiver can’t feed an external power amp directly through its speaker outputs. The common workaround is a speaker-level to line-level converter, sometimes sold as a line-level adapter. This device taps the receiver’s speaker terminals and drops the signal to a safe level for the amp’s inputs. Receiver manufacturers don’t officially support this path, so treat it as a practical fix rather than a clean solution.

After fitting an adapter, double-check each channel—a miswired converter is the most common source of missing or swapped channels. The receiver’s manual remains the primary source for exact terminal names and mapping, since layout varies by brand and model.