{"product_id":"pre-owned-dagostino-progression-m550-early-build-monoblock-amplifier","title":"Pre-owned D'Agostino Progression M550 Early Build Monoblock Amplifier","description":"\u003csection class=\"jss2009\"\u003e\n\u003cp\u003e\u003cstrong\u003eUsed Model Pair\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eConnect with us for more details or to make this piece your own\u003cbr\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003csection\u003e\n\u003cdiv id=\"videoly-videobox-placeholder\"\u003e\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003cp\u003e\u003ca style=\"display: block; text-align: center; text-decoration: none;\" class=\"button button--primary button--sm button--full-width\" rel=\"noopener\" href=\"https:\/\/echohifi.com\/collections\/just-arrived\/products\/dagostino-progression-m550-monoblock-amplifier-early-build-m500-chassis\" target=\"_blank\"\u003e \u003cspan class=\"btn-fill\"\u003e\u003c\/span\u003e \u003cspan class=\"btn-text\"\u003eShop Directly at Echo\u003c\/span\u003e \u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbutton class=\"button button--primary button--sm button--full-width request-info-toggle\" type=\"button\"\u003e \u003cspan class=\"btn-fill\"\u003e\u003c\/span\u003e \u003cspan class=\"btn-text\"\u003eRequest More Info\u003c\/span\u003e \u003c\/button\u003e\u003c\/p\u003e\n\u003c!-- Hidden Hulk Form --\u003e\n\u003cdiv style=\"display: none; margin-top: 20px;\" class=\"request-info-form\"\u003e\n\u003cdiv id=\"y_MmaqZ1MwImIT_lFoyyLw\" class=\"pxFormGenerator\" style=\"margin: 0 auto;\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003cdiv class=\"MuiTypography-root MuiTypography-body1\"\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eEvery so often, a piece comes through that the spec sheet doesn't fully explain.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eThis is an early Progression M550. The full M550 circuit. The full M550 power supply. Built before the second-generation chassis arrived with its larger heat sinks. D'Agostino made it this way — and that is the part that matters. The amplification is all here.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003e550 watts into 8 ohms. 1,100 into 4. 2,200 into 2. The output doubles as the load halves. That is the number to read. It tells you the power supply is real, and most are not.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eWhat the earlier chassis gives up is heat sink mass. In practice, it means this amp is not designed to hold full rated output for extended periods without rest. No one listens that way. Music lives in the transient — the strike of a piano key, the leading edge of a cymbal. Brief, enormous demands. This amplifier meets them in full.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eD'Agostino's circuit, at a price the upgrade cycle opened up. If you already know what that circuit does in a room, this one is worth a conversation.\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan style=\"font-family: -apple-system, BlinkMacSystemFont, 'San Francisco', 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif; font-size: 0.875rem;\"\u003e\u003cb id=\"docs-internal-guid-941d3af4-7fff-0c25-d901-aec6512ac641\"\u003e\u003c\/b\u003e*Stock photos shown \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Dan D'Agostino","offers":[{"title":"Default Title","offer_id":55278537113891,"sku":null,"price":32000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0927\/0027\/9075\/files\/dAgostino-a7.webp?v=1782378342","url":"https:\/\/www.definitive.com\/products\/pre-owned-dagostino-progression-m550-early-build-monoblock-amplifier","provider":"Definitive Audio","version":"1.0","type":"link"}