Notes on Vintage Gear

  • We're still updating pictures. If you want more pictures, just text us with the model number you're looking for (616-369-8366)
  • Speakers & Turntables are in-store only in Grand Rapids, MI (they're delicate!)
  • 1-year warranty on anything over $500. 30-day warranty on anything under $500. Excludes user error (ie if you blow it up). Return shipping responsibility of customer.
1 1

Marantz

Marantz SM-9

Marantz SM-9

$2,300.00 USD
$2,300.00 USD
Sale Sold out

Overview

The Marantz SM-9 is a substantial stereo power amplifier from the early 1980s, produced during the era of Marantz’s distinctive champagne-finished separates. Rated at 150 watts per channel into 8 ohms with both channels operating, it was built for systems that needed significantly more authority than a typical receiver or integrated amplifier could provide.

The design is visually restrained but unmistakably serious. Large illuminated power meters dominate the front panel, while independent level controls and switching for two pairs of speakers give the user practical control over a large two-channel system. Internally, the SM-9 was engineered as a wide-bandwidth DC amplifier, with specifications extending from DC to 100 kHz at the stated tolerance.

Why This Model Matters

The SM-9 represents Marantz at an interesting point in its history. It followed the brand’s famous 1970s receiver period but retained the imposing construction and elegant presentation that made earlier Marantz equipment so recognizable. Rather than chasing novelty, it concentrated on high output, low measured distortion, and the ability to control demanding loudspeakers.

Its published figures remain impressive: no more than 0.01% total harmonic distortion at rated output, a damping factor of 100 or greater, and a 120 dB signal-to-noise ratio. Those numbers help explain why the SM-9 is still respected among enthusiasts assembling powerful period-correct separates systems.

Highlights

  • Approximately 1981–1984 production era
  • 150 watts per channel into 8 ohms
  • Wide-bandwidth DC amplifier design
  • Large illuminated output meters
  • Independent left- and right-channel level controls
  • Connections for two pairs of speakers
  • Heavy 23.5 kg chassis

Who It’s For

The SM-9 suits listeners who want a powerful vintage amplifier with unmistakable Marantz presence. It is especially appealing alongside the matching SC-9 preamplifier, but it can anchor any system with a compatible line-level preamp and speakers that benefit from substantial clean power.
View full details