Vintage Onkyo M504 Power Amplifier.
NOTE: Due to the weight of this amp, we HIGHLY ENCOURAGE pick up in Mooresville, NC,
This beautiful Onkyo POWER HOUSE will drive any speakers that you have, without breaking a sweat! Known for its giant dual VU meters (originally green incandescent, now Blue LEDs). The amp sounds awesome and is a favorite of the vintage Japanese amps. VG cosmetic condition with only some marks on the speaker selector buttons. The optional Rosewood side panels look great. This amp sounds awesome!
AI Stuff:
The Onkyo Integra M-504 is a legendary stereo power amplifier from the late 1980s and early 1990s, revered for its elegant design, robust build, and serious sonic muscle. It’s a favorite among vintage audio collectors who appreciate both aesthetics and performance.
Technical Specifications
• Power Output:
• 165 watts per channel into 8 ohms
• 300 watts into 4 ohms
• 400 watts into 2 ohms
• Frequency Response: 1Hz to 100kHz (+0, -1.5dB)
• Total Harmonic Distortion: = 0.003%
• Intermodulation Distortion: = 0.003%
• Damping Factor: 140
• Signal-to-Noise Ratio: 120dB
• Input Sensitivity: 1V
• Input Impedance: 20kO
• Dimensions: 465 x 185 x 422 mm
• Weight: ~50 lbs (22.5 kg)
Signature Features
• Dual Mono Design: Each channel is independently powered, reducing crosstalk and improving stereo separation.
• Massive Analog VU Meters: Green-lit meters dominate the front panel—iconic and functional.
• Toroidal Transformer & Large Capacitors: Delivers clean, stable power with excellent headroom.
• Speaker Selector: Supports two speaker pairs (A/B) with switching.
• Build Quality: Thick metal chassis, solid internal layout, and premium components throughout.
Era & Legacy
• Production Years: 1987–1997
• Original MSRP: Around $900 USD
• Design Philosophy: Part of Onkyo’s Integra line, which aimed to bridge the gap between consumer and audiophile-grade gear. The M-504 was built to compete with high-end separates from brands like Adcom, NAD, and Rotel.
Why It Still Matters
The M-504 isn’t just about brute force—it’s known for delivering a warm, expansive soundstage with excellent detail and dynamic range. It pairs beautifully with vintage preamps and speakers from the same era, especially if you're chasing that rich analog character.
If you're considering adding one to your collection, it's a showpiece that performs as well as it looks.
NOTE: The video link of amp in action is actually of my other M504, which is not for sale. (The cat IS for sale)
[ITEMPRICE]