D'Agostino Progression M550 Monoblock Amplifier Pair · Early Build, M500 Chassis
ID: #692493
Description
Sold as a pair Definitive is one of the most respected D'Agostino dealers in the country. They know this line the way most shops know their best sellers. Every circuit generation. Every chassis revision. What it needs to perform, and what it gives back when it gets there. When a D'Agostino comes through Definitive on a trade-up, that knowledge comes with it. Here's what this one is. An early Progression M550 … the full M550 circuit and power supply, 550 watts into 8 ohms, 1,100 into 4, 2,200 into 2, housed in the earlier Progression M500 chassis. D'Agostino built it this way during the move to the second generation. The output doubles cleanly as the load drops, which is the tell. That only happens when the power supply behind it is real. And this one has it. The earlier chassis carries less heat sink mass than the later M550 body, so it isn't built to sit at full rated power indefinitely. That's not a limitation anyone hears. Music moves in peaks, not a steady wall, and the peaks are where this amplifier lives. What you're getting is D'Agostino's circuit topology, Definitive's full read on where this unit came from and what it'll do in your room, and a price the later chassis doesn't ask. Came in as a trade-up through our partnership with Definitive. Stock photos shown. Want to go deeper on the circuit, the pairing, or the provenance? We'll put you straight through to Hans at Definitive. He knows this amplifier better than anyone. Please note: This item is currently located at Definitive in Bellevue, WA — not at the Portland shop. If you choose to have it shipped, please allow additional time for transit. If you select in-store pickup, you will receive a confirmation email once the item is ready. For any questions, please contact us directly. $50,000 MSRP per pair Due to size and weight, this item may incur an additional shipping surcharge and is listed as Store Pick Up Only. Contact us for a quote if you wish to have it Shipped. Phone: 888-248-3246 Email: [email protected] Inquire Now
Price
$32000.00
Last Updated
10 August 2026, 01:33 UTC
Store Information
physical store
Location
More from Echo Audio
View all
KEF LS50 Meta Speakers
$1599.99
The LS50 is the speaker that reset expectations for what a compact stand-mount could do. KEF's Uni-Q driver — tweeter mounted concentrically in the center of the midwoofer — produces a point-source dispersion pattern that most multi-driver designs spend a lot of money trying to approximate. The result is imaging that doesn't care where you're sitting and a soundstage that routinely embarrasses larger, more expensive speakers. 5.25-inch woofer, 1-inch tweeter, sealed cabinet machined to tight tolerances. Bass rolls off around 79Hz in-room — pair with a sub or appropriate amplification and placement. The original LS50 is one of the most important speaker designs of the last 20 years.
Linn Klimax DS/0 Music Player/Streamer
$3500.00
The Linn Klimax DS/0 (2007 variant) is a reference-grade digital music player introduced in July 2007, delivering pristine 24‑bit/192 kHz streaming through its meticulously crafted aluminum chassis with separate analog, digital, logic, and power supply chambers. $18,500 MSRP
KEF KC62 Subwoofer
$1699.99
Now available in Titanium, this compact subwoofer packs a serious punch. With dual 6.5" force-cancelling drivers and 1,000W RMS of clean power, it delivers deep, tight bass that defies its size. A true Echo Pick—small footprint, massive performance. Review
KEF LS60 Wireless Speakers
$5999.99
The KEF LS60 Wireless is a sleek, all-in-one floorstanding speaker system that celebrates KEF’s 60th anniversary with cutting-edge innovation. Featuring Single Apparent Source technology from the Blade series, 12th-gen Uni-Q drivers with Metamaterial Absorption Technology (MAT), and Uni-Core force-cancelling woofers, it delivers stunning clarity, deep bass, and pinpoint imaging. With 1,400 watts of built-in amplification and extensive streaming options—Wi-Fi, Bluetooth, AirPlay 2, Chromecast, HDMI eARC, and more—the LS60 offers true high-fidelity performance in a minimalist, design-forward package. Due to size and weight, this item may incur an additional shipping surcharge and is listed as Store Pick Up Only. Contact us for a quote if you wish to have it Shipped. Phone: 888-248-3246 Email: [email protected] Inquire Now
KEF Reference 1 Meta Speakers
$9999.98
The KEF Reference 1 Meta is a premium three-way bookshelf speaker featuring KEF’s 12th-generation Uni-Q® driver with MAT™ for unmatched clarity and realism. With a 1″ tweeter, 5″ midrange, and 6.5″ woofer, it delivers a wide frequency response of 45Hz–35kHz and 85dB sensitivity. Designed for serious listening, it’s housed in a robust, resonance-reducing cabinet with elegant finish options. Review Due to size and weight, this item may incur an additional shipping surcharge and is listed as Store Pick Up Only. Contact us for a quote if you wish to have it Shipped. Phone: 888-248-3246 Email: [email protected] Inquire Now
Bowers & Wilkins 704 S3
$4500.00
The 704 S3 is the slimmest tower loudspeaker Bowers & Wilkins offers, yet it still delivers a powerful performance. Its twin Aerofoil Profile bass drivers provide impressive extension and scale, while the decoupled Continuum cone FST™ driver ensures crystal-clear midrange, bringing exceptional clarity to every note. Due to size and weight, this item may incur an additional shipping surcharge and is listed as Store Pick Up Only. Contact us for a quote if you wish to have it Shipped. Phone: 888-248-3246 Email: [email protected] Inquire Now