Onkyo Icon M-80 Power Amplifier

Onkyo M-80: Icon Series Power for Demanding Speakers

The Onkyo M-80 is a two-channel Class AB power amplifier from Onkyo's Icon Series. Onkyo rates it at 130 watts per channel into 8 ohms and 200 watts into 4 ohms.

It takes a signal from your preamp over balanced XLR or RCA, and its backlit power meters show the output as you listen. It comes in Black or Silver.

A Three-Stage Inverted Darlington Output

The M-80 uses a three-stage Inverted Darlington amplifier with very low output impedance, so it can deliver large current to your speakers. Onkyo keeps negative feedback low so noise from the speaker does not affect the amplifier.

The output transistors are wired in parallel for strong instantaneous current. The driver stage uses Onkyo's DIDRC circuit, a high-slew-rate design that reduces noise in the ultra-high frequency band.

Built to Control Vibration

The housing pairs two aluminum side panels with a steel top panel. Onkyo says this three-piece construction increases rigidity and suppresses vibration.

A custom high-current power supply, 10,000 µF capacitors made for Onkyo and an extruded aluminum heat sink complete the design.

Power Meters You Can Read

Two backlit power meters show output in watts. A front button switches the range between x1 and x10 or turns the meters off, and the backlight has its own button.

How the M-80 Fits Your System

The M-80 needs a separate preamplifier or a source with a variable output. Connect it with one pair of balanced XLR cables or one pair of RCA cables, and choose the input with the rear switch.

Two sets of speaker terminals, A and B, can run two pairs of speakers. Use 4 to 16 ohm speakers on A or B alone, or 8 to 16 ohm speakers when both play at once.

A 12V trigger input lets a compatible preamp switch the M-80 on and off, and a cable is included. Auto standby turns it off after 20 minutes with no signal.

What it will not do: it has no volume control, no source inputs and no DAC or streaming. It is a stereo power amplifier, not an integrated amplifier or receiver.

What Reviewers Are Saying

Jeff Wheaton reviewed the M-80 with Onkyo's P-80 preamplifier for Secrets of Home Theater and High Fidelity (October 2026). He wrote that the pair "managed the iron-fist control of bass-with-body, soul, finesse, delicacy, and dynamics."

He also wrote: "I am firmly a tube guy, and have been for the past 30 years, but these two, the Onkyo P-80 Network Preamplifier and Onkyo M-80 Power Amplifier, have me questioning my loyalty and have me thinking of how I can get a pair of these to keep!"

Who Is This Power Amplifier Best For?

• Owners of large speakers — 200 watts per channel into 4 ohms gives big speakers room to breathe.
• Separates builders — pair it with a preamp you choose, over balanced XLR or RCA.
• Two-room or two-pair systems — A/B speaker outputs switch from the front panel.
• Anyone who likes classic hi-fi looks — backlit meters show the power you are using.
• Not for — anyone who wants one box with a volume control and inputs; choose an integrated amplifier instead.

How Does It Connect to Your System?

• Connect your preamp's output to the M-80's XLR or RCA input, and set the rear INPUT SELECT switch to match.
• Connect your speakers to the A terminals, and a second pair to B if you have one.
• Optionally, link the 12V trigger to your preamp with the included cable.
• Plug in the power cord last, then switch on.

The M-80 comes in Black or Silver.

Pairs Well With

Build your separates system around the M-80:

• Preamplifiers — the M-80 needs one to set volume and choose sources.
• Floorstanding speakers — large speakers make the most of its power.
• Interconnect cables — XLR or RCA from your preamp.
• Speaker cables — for one or two pairs of speakers.

Frequently Asked Questions

Do I need a preamplifier?

Yes. The M-80 has no volume control or source inputs. Connect it to a preamp or a source with a variable output.

Does it have balanced inputs?

Yes. It has one pair of balanced XLR inputs and one pair of RCA inputs, chosen with a rear switch.

Can I run two pairs of speakers?

Yes, using the A and B outputs. When both pairs play at once, use speakers rated 8 to 16 ohms.

Will it turn on with my preamp?

Yes, if your preamp has a 12V trigger output. Connect them with the included 12V trigger cable.

Does it need to warm up?

Onkyo says 10 to 30 minutes of warm-up stabilizes the internal components and improves the sound.

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