All three are different. All three are fantastic. It's time to discuss what they bring to the table in terms of performance.

Quick-Specs

Yamaha AS1200: 90w (8 ohms) Single Ended Circuit. $2,800
150w (4 ohms)

Luxman L550 AXII: 20w (8 ohms)*** Balanced Circuit. $5,500
40w (4 ohms)***

Accuphase E480: 180w (8 ohms) Balanced Circuit. $13,000
260w (4 ohms)

Note: *** indicates information that may not accurately represent real world specifications.

To access complete specifications, visit the product pages here:

Yamaha AS1200 Product Page: https://usa.yamaha.com/products/audio...
Luxman L550 AXII Product Page: http://www.luxman.com/product/detail....
Accuphase E-480 Product Page: http://www.accuphase.com/model/e-480....

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Dedicated review of the Accuphase E480:    • 綺麗な Accuphase E-480 Integrated Amplif...  

Dedicated review of the Yamaha AS1200:    • Review!  The Yamaha A-S1200 Integrate...  

Dedicated review of the Luxman L550AXII:    • Review! Luxman L550 AXII Integrated A...  

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The primary speakers used in this comparison include the following:

Dynaudio Confidence 20
Klipsch Cornwall IV
Falcon Acoustics LS3/5a Gold Badge
Harbeth P3ESR
Gershman Audio Avant Garde
Falcon Acoustics 'MoFi' Edition LS3/5a
Triangle Genese Trio